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DESCRIPTION JP2009038414

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DESCRIPTION JP2009038414
An object of the present invention is to perform acoustic adjustment according to acceleration
quickly with a simple configuration. An acceleration sensitive capacitor element is employed as
an element of a circuit that performs acoustic adjustment processing on an analog audio signal,
and acoustic adjustment characteristics are changed according to a change in acceleration. For
example, in the low pass filter circuit 230, composite capacitor circuits 620 and 650, which are
part of elements for determining the cut-off frequency, include acceleration sensitive capacitor
elements. As a result, when the acceleration changes, the capacitance values CC1F and CC2F of
the composite capacitor circuits 620 and 650 change, and the cutoff frequency of the low pass
filter circuit 230 changes. [Selected figure] Figure 9
Sound equipment
[0001]
The present invention relates to an acoustic device.
[0002]
BACKGROUND ART Heretofore, audio devices for reproducing audio such as music have been
widely used.
Among such acoustic devices, there are devices that are mounted on a mobile body such as a
vehicle. In the case of an acoustic device mounted on such a moving body, sounds other than
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voice such as music are often generated as noise sounds as the moving body moves. Therefore,
for example, a technology has been proposed for detecting the acceleration of a vehicle and
applying control corresponding to the detection result to the equalizer circuit (see Patent
Document 1: hereinafter, referred to as “conventional example”).
[0003]
In the prior art, a configuration including an acceleration sensor and a signal processing circuit is
adopted as an external circuit of the equalizer circuit. And in this prior art technique, a signal
processing circuit processes and analyzes the signal of the detection result by an acceleration
sensor. Then, the signal processing circuit issues an audio adjustment control command to the
equalizer circuit based on the analysis result.
[0004]
Japanese Patent Application Publication No. 10-504946
[0005]
However, in the above-described conventional example, a signal processing circuit configured to
include, for example, a microprocessor and a DSP (Digital Signal Processor) in addition to the
acceleration sensor in order to perform sound adjustment by the equalizer circuit according to
the detection result of acceleration. It is hard to say that sound adjustment corresponding to
acceleration can be performed with a simple circuit configuration.
Moreover, since the detection result by the acceleration sensor is reflected on the equalizer
circuit via the signal processing circuit, it is difficult to quickly adjust the sound according to the
detection result of the acceleration.
[0006]
For this reason, there is a demand for a technology capable of performing acoustic adjustment by
an equalizer circuit or the like according to the detection result of acceleration with a simple
configuration and quickly. Responding to such a request is one of the problems to be solved by
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the present invention.
[0007]
The present invention has been made in view of the above-described circumstances, and an
object thereof is to provide a new acoustic device capable of performing acoustic adjustment
according to acceleration easily and quickly.
[0008]
The invention according to claim 1 is an acoustic device for reproducing and outputting sound
from a speaker after performing signal processing for sound adjustment, wherein an acceleration
sensitive capacitor whose capacitance value changes according to a change in acceleration. It is
an acoustic apparatus characterized by comprising one or more signal processing means that
includes an element and performs an acoustic adjustment process on an analog audio signal
corresponding to the capacitance value of the acceleration sensitive capacitor element.
[0009]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In the following description and the drawings, the same or equivalent elements will be denoted
by the same reference symbols, without redundant description.
[0010]
[Configuration] FIG. 1 is a block diagram showing a schematic configuration of an acoustic device
100 according to an embodiment.
In the following description, the acoustic device 100 is assumed to be a device mounted on a
vehicle.
[0011]
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As shown in FIG. 1, the acoustic device 100 includes a control unit 110 and a drive unit 120. The
acoustic device 100 further includes sound output units 1301 to 1303.
[0012]
Here, the sound output unit 1301 has a left speaker 1311, and the sound output unit 1302 has a
light speaker 1312. Also, the sound output unit 1303 has a subwoofer speaker 1313.
[0013]
Furthermore, the acoustic device 100 includes a display unit 140 and an operation input unit
150. The acoustic device 100 further includes a velocity sensor interface (IF) unit 160.
[0014]
The elements 120 to 160 other than the control unit 110 are connected to the control unit 110.
[0015]
The control unit 110 centrally controls the entire sound device 100.
The details of the control unit 110 will be described later.
[0016]
When the compact disc CD in which audio content is recorded is inserted into the drive unit 120,
the drive unit 120 reports that effect to the control unit 110. When the drive unit 120 receives a
reproduction command DVC of the audio content from the control unit 110 in the state where
the compact disc CD is inserted, the drive unit 120 reads out the audio for which reproduction is
specified from the compact disc CD. The readout result of the audio content is sent to the control
unit 110 as content data CTD which is an audio signal.
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[0017]
Each of the sound output units 130 k (k = 1 to 3) includes a power amplifier for amplifying an
audio output signal AOSk received from the control unit 110 in addition to the above-described
speaker 131 k. Under the control of the control unit 110, these sound output units 130k
reproduce and output sounds such as music corresponding to the sound output signal AOSk.
[0018]
The display unit 140 is based on (i) a display device 141 such as a liquid crystal display panel, an
organic EL (Electro Luminescence) panel, or a PDP (Plasma Display Panel), and (ii) display control
data sent from the control unit 110. A display controller such as a graphic renderer that controls
the entire display unit 140, and (iii) a display image memory for storing display image data, and
the like are provided. The display unit 140 displays operation guidance information and the like
under the control of the control unit 110.
[0019]
The operation input unit 150 is configured of a key portion provided on the main body portion of
the acoustic device 100 or a remote input device or the like including the key portion. Here, a
touch panel provided on the display device 141 of the display unit 140 can be used as the key
part provided on the main body. In addition, it can replace with the structure which has a key
part, and can also employ | adopt the structure which voice-inputs.
[0020]
When the user operates the operation input unit 150, the setting of the operation content of the
acoustic device 100 is performed. For example, the user uses the operation input unit 150 to
issue an instruction to reproduce audio content and an instruction to set characteristics of the
sound adjustment process described later. Such input contents are sent from the operation input
unit 150 to the control unit 110 as operation input data IPD.
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[0021]
The speed sensor IF unit 160 is used to exchange data with a vehicle speed sensor mounted on
the vehicle in order to detect the moving speed of the vehicle. The moving speed SPD of the
vehicle detected by the vehicle speed sensor is sent to the control unit 110 via the speed sensor
IF unit 160.
[0022]
The control unit 110 generally controls the entire acoustic device 100 as described above. As
shown in FIG. 2, the control unit 110 includes a control processing unit 111 as first and second
control means, and an audio processing unit 112. The control unit 110 further includes an
analog conversion unit 113, an acoustic adjustment unit 114, and a clock generation unit 119.
[0023]
The control processing unit 111 controls the audio processing unit 112 and the sound
adjustment unit 114 based on the command input input to the operation input unit 150 and the
moving speed SPD of the vehicle sent from the speed sensor IF unit 160. Further, the control
processing unit 111 controls the drive unit 120 and the display unit 140. The details of the
control processing unit 111 will be described later.
[0024]
The audio processing unit 112 automatically reproduces the content when it is reported from the
operation input unit 150 that the specification input of the content to be reproduced including
the audio content is made from the operation input unit 150 and when the compact disc CD is
inserted into the drive unit 120 If the setting to be performed is made, content data CTD
corresponding to the content to be reproduced is read out from the drive unit 120 and expanded
according to the audio content processing control command APC from the control processing
unit 111, and the digital sound data signal Generate Subsequently, the audio processing unit 112
analyzes the generated digital sound data signal, and the digital sound data signal is supplied to
each of the speakers 1311, 1312 and 1313 described above according to channel designation
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information included in the digital sound data signal. To separate The signals thus separated are
output as channel processing signals PCD1, PCD2, and PCD3 to the analog conversion unit 113.
[0025]
The analog conversion unit 113 converts the channel processing signals PCD1, PCD2, and PCD3,
which are digital signals sent from the audio processing unit 112, into analog signals. The analog
conversion unit 113 includes three DA (Digital to Analogue) converters configured similarly to
each other in correspondence to the three types of digital signals. The analog audio signals PCS1,
PCS2, and PCS3 that are conversion results by the analog conversion unit 113 are sent to the
sound adjustment unit 114.
[0026]
The sound adjustment unit 114 performs sound adjustment processing on the analog audio
signals PCS1, PCS2, and PCS3 sent from the analog conversion unit 113. The sound adjustment
unit 114 includes an equalizer unit 210 and a loudness unit 220 as shown in FIG. Further, the
sound adjustment unit 114 includes a low pass filter circuit 230 as low pass filter means and a
volume adjustment unit 240.
[0027]
The equalizer unit 210 performs signal processing on each of the analog audio signals PCS1 and
PCS2 from the analog conversion unit 113. The equalizer unit 210 includes equalizer circuits
(EQ) 211 1 and 2112 each functioning as first and second equalizer means which are one of
signal processing means. Here, the equalizer circuit 2111 performs signal processing on the
analog audio signal PCS1, and outputs an equalizer adjustment signal PES1 as a processing result
to a loudness circuit (LD) 2211 described later. In addition, the equalizer circuit 2112 performs
signal processing on the analog audio signal PCS2, and outputs an equalizer adjustment signal
PES2 as a processing result to a loudness circuit (LD) 2212 described later.
[0028]
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Each of the equalizer circuits 211i (i = 1, 2) processes each frequency band of N divided bands,
and generates an equalizer adjustment signal PESi based on the processing result. As shown in
FIG. 4, each of the equalizer circuits 211 i having such a function includes N individual equalizer
circuits 212 i 1 to 212 i N corresponding to the number of divided bands, and an addition unit
213.
[0029]
Each of the individual equalizer circuits 212 ij (i = 1, 2; j = 1 to N) performs amplification or
attenuation processing on a signal in the frequency band of the j-th band in the analog audio
signal PCSi from the analog conversion unit 113. As shown in FIG. 5, each of the individual
equalizer circuits 212ij having such a function includes a band pass filter (BPF) 310ij and a
resistance element 320ij. Each of the individual equalizer circuits 212 ij includes a switched
capacitor circuit 330 ij and an operational amplifier (OP amp: Operational Amplifier) 340.
[0030]
Here, the signal input terminal of the BPF 310 ij is connected to the analog conversion unit 113
and receives the analog audio signal PCSi from the analog conversion unit 113. The signal output
terminal of the BPF 310ij is connected to the first terminal of the resistive element 320ij, and the
band extraction signal BCSij is output from the output terminal of the BPF 310ij to the resistive
element 320ij.
[0031]
The clock signals CK1 and CK2 from the clock generation unit 119 are supplied to the BPF 310ij.
Here, the clock signal CK1 is composed of two clock signals CK11 and CK12 whose phases are
opposite to each other, and when one is a significant level, the other is an insignificant level (see
FIG. 7). The clock signal CK2 is composed of two clock signals CK21 and CK22 which are in
opposite phase to each other, and when one is at a significant level, the other is at a nonsignificant level.
[0032]
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The second terminal of the resistive element 320ij is connected to the negative input terminal of
the operational amplifier 340 and the first terminal of the switched capacitor circuit 330ij. The
positive input terminal of the operational amplifier 340 is set to the level of the reference voltage
VREF (for example, the ground level). The output terminal of the operational amplifier 340 is
connected to the second terminal of the switched capacitor circuit 330ij. Then, the signal PBSij is
output from the output terminal of the operational amplifier 340 to the addition unit 213.
[0033]
The clock signal CK3 from the clock generation unit 119 is supplied to the switched capacitor
circuit 330ij. Here, the clock signal CK3 is composed of two clock signals CK31 and CK32 which
are in opposite phase to each other, and when one is at a significant level, the other is at a nonsignificant level.
[0034]
The BPF 310 ij extracts the signal in the frequency band of the j-th band in the analog audio
signal PCSi from the analog conversion unit 113. As shown in FIG. 6, the BPF 310ij having such a
function includes a switched capacitor circuit 311ij and a variable capacitor element 312ij. Also,
the BPF 310 ij includes a resistor element 313 ij and a capacitor element 314 ij. Furthermore, the
BPF 310 ij includes a switched capacitor circuit 315 ij and an operational amplifier 316.
[0035]
Here, the first terminal of the switched capacitor circuit 311 ij is connected to the analog
conversion unit 113, and receives the analog audio signal PCSi from the analog conversion unit
113. The second terminal of the switched capacitor circuit 311ij is connected to the first terminal
of the variable capacitor element 312ij, the first terminal of the resistor element 313ij, and the
first terminal of the capacitor element 314ij. In addition, the second terminal of the resistive
element 313ij is grounded.
[0036]
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The clock signal CK1 from the clock generation unit 119 is supplied to the switched capacitor
circuit 311ij. Further, the clock signal CK2 from the clock generation unit 119 is supplied to the
switched capacitor circuit 315ij.
[0037]
The second terminal of the variable capacitor element 312 ij is connected to the first terminal of
the switched capacitor circuit 315 ij and the negative input terminal of the operational amplifier
316. The positive input terminal of the operational amplifier 316 is set to the level of the
reference voltage VREF (for example, the ground level). The output terminal of the operational
amplifier 316 is connected to the second terminal of the switched capacitor circuit 315ij and the
second terminal of the capacitor element 314ij.
[0038]
As shown in FIG. 7, the switched capacitor circuit 311 ij is configured to include an acceleration
sensitive variable capacitor element 353 ij and four analog switch elements 354, 355, 356, and
357. Here, the first terminal of the variable capacitor element 353 ij is connected to the first
terminal of the switch element 354 and the first terminal of the switch element 357. The second
terminal of the variable capacitor element 353 ij is connected to the first terminal of the switch
element 355 and the first terminal of the switch element 356.
[0039]
The second terminal of the switch element 355 and the second terminal of the switch element
357 are grounded. The second terminal of the switch element 354 is the first terminal of the
switched capacitor circuit 311ij, and the second terminal of the switch element 356 is the second
terminal of the switched capacitor circuit 311ij.
[0040]
The clock signal CK11 is supplied to the switch elements 354 and 355. When the clock signal
CK11 is at the significant level, the switch elements 354 and 355 are turned on, and when the
clock signal CK11 is at the insignificant level, the switch The elements 354 and 355 are in the
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OFF state.
[0041]
In addition, when the clock signal CK12 is supplied to the switch elements 356 and 357, and the
clock signal CK12 is at the significant level, the switch elements 356 and 357 are turned on and
the clock signal CK12 is at the insignificant level. The switch elements 356 and 357 are in the
OFF state.
[0042]
The variable capacitor element 353 ij is an acceleration sensitive capacitor element that changes
a capacitance value according to a change in acceleration.
The variable capacitor element 353 ij is manufactured, for example, using silicon micro
processing technology (MEMS: Micro Electro Mechanical Systems).
In the present embodiment, the variable capacitor element 353 ij is disposed such that the
capacitance value CW ij changes in accordance with the acceleration at the time of acceleration
and deceleration of the vehicle.
[0043]
In the switched capacitor circuit 311ij configured as described above, the switch elements 354
and 355 are turned ON in the first period in which the clock signal CK11 is significant (that is,
the clock signal CK12 is insignificant). The switch elements 356 and 357 are turned off, and
charge is accumulated in the variable capacitor element 353 ij via the first terminal of the
switched capacitor circuit 311 ij. Then, in the second period in which the clock signal CK11 is not
significant (that is, the clock signal CK12 is significant), the switch elements 354 and 355 are in
the OFF state, and the switch elements 356 and 357 are in the ON state. The charge stored in the
variable capacitor element 353ij in the first period is discharged through the second terminal of
the switched capacitor circuit 311ij. By sequentially repeating the operation of the first period
and the operation of the second period, the switched capacitor circuit 311 ij performs an
operation equivalent to that of the resistance element.
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[0044]
The equivalent resistance value (hereinafter, also simply referred to as “resistance value”)
RV1Cij of the switched capacitor circuit 311ij is determined according to the capacitance value
CWij of the variable capacitor element 353ij. Here, as described above, since the variable
capacitor element 353 ij is an acceleration sensitive capacitor element that changes the
electrostatic capacitance value according to the change in acceleration, the switched capacitor
circuit 311 ij has a resistance value according to the change in acceleration. Acts as an
acceleration sensitive resistance element that changes.
[0045]
Returning to FIG. 6, the variable capacitor element 312ij is an acceleration sensitive capacitor
element as in the case of the above-described variable capacitor element 353ij. Further, the
resistance element 313ij has a fixed resistance value RCij. Furthermore, the capacitor element
314ij has a fixed capacitance value CCij.
[0046]
The switched capacitor circuit 315 ij is different from the above-described switched capacitor
circuit 311 ij in that the capacitance characteristic of the acceleration sensitive capacitor element
to be adopted is different and that the clock signal CK 2 is supplied from the clock generation
unit 119. Except for this, the configuration is the same as that of the switched capacitor circuit
311 ij. Similar to the switched capacitor circuit 311ij, the switched capacitor circuit 315ij also
operates as an acceleration sensitive resistance element. The switched capacitor circuit 315 ij is a
feedback resistive element whose first terminal is connected to the negative input terminal of the
operational amplifier 316 and whose second terminal is connected to the output terminal of the
operational amplifier 316.
[0047]
The center frequency of the BPF 310ij configured as described above is determined by the ratio
of the resistance value RV1Cij of the switched capacitor circuit 311ij to the capacitance value
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CVCij of the variable capacitor element 312ij. Also, the Q value of the BPF 310ij is determined by
the ratio of the resistance value RV2Cij of the switched capacitor circuit 315ij to the capacitance
value CVCij of the variable capacitor element 312ij. As described above, since the central
frequency and the Q value have acceleration-dependent values CVCij, RV1Cij, and RV2Cij as
parameters, they change in accordance with the change in acceleration of the vehicle.
[0048]
Thus, the BPF 310 ij extracts from the analog audio signal PCSi a signal of a frequency band that
is determined according to the center frequency and the Q value that change according to the
acceleration change of the vehicle. The extraction result is output as a signal BCSij from the BPF
310 ij toward the first terminal of the resistive element 320 ij (see FIG. 5).
[0049]
Returning to FIG. 5, the resistance element 320ij has a fixed resistance value RGij.
[0050]
The switched capacitor circuit 330 ij is different from the above-described switched capacitor
circuit 311 ij in that the capacitance characteristic of the acceleration sensitive capacitor element
to be adopted is different and that the clock signal CK 3 is supplied from the clock generation
unit 119. Except for this, the configuration is the same as that of the switched capacitor circuit
311 ij.
This switched capacitor circuit 330ij also operates as an acceleration sensitive resistance
element, similarly to the switched capacitor circuit 311ij. The switched capacitor circuit 330 ij is
a feedback resistive element whose first terminal is connected to the negative input terminal of
the operational amplifier 340 and whose second terminal is connected to the output terminal of
the operational amplifier 340.
[0051]
The portion composed of the above-mentioned resistance element 320ij, switched capacitor
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circuit 330ij and operational amplifier 340 amplifies signal BCSij from BPF 310ij to generate
signal PBSij. The amplification factor at the time of generation of the signal PBSij is determined
by the ratio of the resistance value RGij of the resistance element 320ij to the resistance value
RVGij of the switched capacitor circuit 330ij. Here, since the resistance value RVGi changes
according to the change in acceleration, the amplification factor also changes automatically
according to the change in acceleration of the vehicle, as in the case of the center frequency and
the Q value in the above-mentioned BPF 310ij. . The signal processed by the individual equalizer
circuit 212 ij in this manner is sent to the adding unit 213 as a signal PBS ij.
[0052]
Returning to FIG. 4, the addition unit 213 receives the analog audio signal PCSi and the signals
PBSi1 to PBSiN from the individual equalizer circuits 212i1 to 212iN. Then, the adding unit 213i
adds these signals. The addition result is sent to the loudness circuit 221i as an equalizer
adjustment signal PESi.
[0053]
Returning to FIG. 3, the loudness unit 220 automatically adjusts the degree of attenuation of the
midrange (that is, the gain of the midrange) in the reproduced sound. The loudness unit 220
includes loudness circuits (LD) 221 1 and 2212 as loudness adjustment means. Here, the
loudness circuit 2211 performs adjustment to increase or decrease the degree of attenuation of
the above-mentioned midrange with respect to the equalizer adjustment signal PES1 sent from
the equalizer circuit 2111, and a signal PLS1 which is the adjustment result will be described
later. It outputs toward (VL) 2411. Further, the loudness circuit 2212 performs adjustment to
increase or decrease the degree of attenuation of the midrange with respect to the equalizer
adjustment signal PES2 sent from the equalizer circuit 2112, and the signal PLS2 as the
adjustment result is described in volume adjustment circuit (VL) described later. Output to 2412.
[0054]
In the present embodiment, the loudness circuit 221i (i = 1, 2) includes a buffer amplifier 510, a
resistor 520i, and a switched capacitor circuit 530i, as shown in FIG. The loudness circuit 221i
further includes a low pass filter (LPF) 540i, a high pass filter (HPF) 550i, and an adder 560.
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[0055]
Here, the signal input terminal of the buffer amplifier 510 is connected to the equalizer unit 210
(more specifically, the equalizer circuit (EQ) 211i) to receive the equalizer adjustment signal PESi.
Further, the signal output terminal of the buffer amplifier 510 is connected to the first terminal
of the resistance element 520i. The second terminal of the resistive element 520i is connected to
the first terminal of the switched capacitor circuit 530i. Then, the signal PLSi is output from the
second terminal of the resistance element 520i.
[0056]
The clock signal CK4 from the clock generation unit 119 is supplied to the switched capacitor
circuit 530ij. Here, the clock signal CK4 is composed of two clock signals CK41 and CK42 that
are in opposite phase to each other, and when one is at a significant level, the other is at a nonsignificant level.
[0057]
As in the case of the signal input terminal of the buffer amplifier 510, the equalizer adjustment
signal PESi from the equalizer unit 210 is supplied to the signal input terminal of the LPF 540i.
Further, the signal output terminal of the LPF 540 i is connected to the first signal input terminal
of the adder 560.
[0058]
The equalizer adjustment signal PESi from the equalizer unit 210 is supplied to the signal input
terminal of the HPF 550i, as in the case of the signal input terminal of the buffer amplifier 510.
Further, the signal output terminal of the HPF 550 i is connected to the second signal input
terminal of the adder 560.
[0059]
The signal output terminal of the adder 560 is connected to the second terminal of the switched
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capacitor circuit 530ij.
[0060]
The buffer amplifier 510 amplifies the power of the equalizer adjustment signal PESi from the
equalizer unit 210.
Also, the resistor 520i has a fixed resistance value RLi.
[0061]
The switched capacitor circuit 530i is different from the above-described switched capacitor
circuit 311ij in that the capacitance characteristic of the acceleration sensitive capacitor element
to be adopted is different, and that the clock signal CK4 is supplied from the clock generation
unit 119. Except for this, the configuration is the same as that of the switched capacitor circuit
311 ij. This switched capacitor circuit 530i also operates as an acceleration sensitive resistance
element, similarly to the switched capacitor circuit 311ij.
[0062]
The LPF 540i is configured as an analog filter such as an active second-order filter. The LPF 540i
selectively passes a signal having a frequency equal to or lower than a cutoff frequency
determined by the circuit configuration of the LPF 540i with respect to the equalizer adjustment
signal PESi. The signal that has passed through the LPF 540i is output to the adder 560.
[0063]
The HPF 550i is configured as an analog filter such as an active second-order filter. The HPF
550i selectively passes a signal having a frequency higher than that determined by the circuit
configuration of the HPF 550i with respect to the equalizer adjustment signal PESi. The signal
that has passed through the HPF 550i is output to the adder 560. The cutoff frequency of the
LPF 540i described above and the cutoff frequency of the HPF 550i have different values.
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[0064]
The adder 560 receives the signal that has passed through the LPF 540i and the signal that has
passed through the HPF 550i. Then, the adder 560 adds these signals, and outputs the addition
result to the second terminal of the switched capacitor circuit 530i.
[0065]
The loudness circuit 221i configured as described above increases or decreases the degree of
attenuation in the middle range with respect to the equalizer adjustment signal PESi from the
equalizer unit 210, but the degree of attenuation in the middle range is the resistance value RVLi
of the switched capacitor circuit 530i. It changes with the value of. Therefore, the degree of
attenuation in the middle region of the loudness circuit 221i also automatically changes in
accordance with the change in acceleration of the vehicle.
[0066]
Returning to FIG. 3, the low pass filter circuit 230 receives the analog audio signal PCS3 from the
analog conversion unit 113. Then, the low pass filter circuit (LPF) 230 selectively passes a signal
having a frequency equal to or lower than a cutoff frequency determined by the circuit
configuration.
[0067]
In the present embodiment, the LPF 230 is an active second-order filter, and as shown in FIG. 9,
includes the resistive element 610 and the composite capacitor circuit 620. The LPF 230 also
includes a resistive element 630, an operational amplifier 640, and a composite capacitor circuit
650.
[0068]
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Here, the first terminal of the resistance element 610 is connected to the analog conversion unit
113 so as to receive the analog audio signal PCS3. In addition, the second terminal of the
resistive element 610 is connected to the first terminal of the composite capacitor circuit 620,
the first terminal of the resistive element 630, and the first terminal of the composite capacitor
circuit 650. The second terminal of the composite capacitor circuit 620 is grounded.
[0069]
The switch control signal SC1 is supplied to the composite capacitor circuit 620 from the control
processing unit 111. Here, the switch control signal SC1 is composed of five individual switch
control signals SC11 to SC15 (see FIG. 10).
[0070]
The second terminal of the resistive element 630 is connected to the negative input terminal of
the operational amplifier 640. The positive input terminal of the operational amplifier 640 is set
to the level of the reference voltage VREF (for example, the ground level). Also, the output
terminal of the operational amplifier 640 is connected to the second terminal of the composite
capacitor circuit 650. Then, the signal PLS3 is output from the output terminal of the operational
amplifier 640 toward the volume adjustment unit 240 (more specifically, to the volume
adjustment circuit (VL) 2413).
[0071]
The complex capacitor circuit 650 is supplied with the switch control signal SC2 from the control
processing unit 111. Here, the switch control signal SC2 is composed of five individual switch
control signals SC21 to SC25 (see FIG. 11).
[0072]
The resistive element 610 has a fixed resistance value R1F. In addition, the resistive element 630
has a fixed resistance value R2F.
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[0073]
The composite capacitor circuit 620 includes, as shown in FIG. 10, an acceleration sensitive
variable capacitor element 621 and four capacitor elements 6221 to 6224 each having a fixed
capacitance value. In addition, the composite capacitor circuit 620 includes five switch elements
6231 to 6235.
[0074]
As the variable capacitor element 621, an acceleration sensitive capacitor element is employed as
in the case of the above-mentioned variable capacitor element 363ij.
[0075]
The capacitor elements 621 to 6224 are connected in series or in parallel to the variable
capacitor element 621 by opening and closing of the switch elements 6231 to 6235.
Thus, the capacitance value CC1F of the composite capacitor circuit 620 is determined by the
circuit configuration formed corresponding to the opening and closing of the switch elements
6231 to 6235.
[0076]
A corresponding individual switch control signal SC1p is supplied from the control processing
unit 111 to each of the switch elements 623p (p = 1 to 5). Then, each of the switch elements
623p opens and closes in response to an individual opening and closing command by the
individual switch control signal SC1p.
[0077]
In the composite capacitor circuit 620 configured as described above, the control processing unit
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111 appropriately issues a switch open / close command by the switch control signal SC1,
whereby the change range of the electrostatic capacitance value CC1F is determined. Then, the
capacitance value CVF1 of the variable capacitor element 621 is changed according to the
change of the acceleration of the vehicle, whereby the capacitance value CC1F of the composite
capacitor circuit 620 is changed within the change range. .
[0078]
Returning to FIG. 9, the composite capacitor circuit 650 includes, as shown in FIG. 11, an
acceleration sensitive capacitor element 651 and four capacitor elements 6521 to 6524 each
having a fixed capacitance value. The composite capacitor circuit 650 also includes five switch
elements 6531 to 6535.
[0079]
As the variable capacitor element 651, similarly to the above-described variable capacitor
element 621, an acceleration sensitive capacitor element is employed.
[0080]
The capacitor elements 6521 to 6524 are connected in series or in parallel to the variable
capacitor element 651 by opening and closing of the switch elements 651 to 6535.
Thus, the capacitance value CC2F of the composite capacitor circuit 650 is determined by the
circuit configuration formed corresponding to the opening and closing of the switch elements
6531 to 6535.
[0081]
A corresponding individual switch control signal SC2 q is supplied from the control processing
unit 111 to each of the switch elements 653 q (q = 1 to 5). Then, each of the switch elements
653 q opens and closes in response to an individual opening and closing command by the
individual switch control signal SC 2 q.
10-04-2019
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[0082]
In the complex capacitor circuit 650 configured as described above, the control processing unit
111 appropriately issues a switch open / close command according to the switch control signal
SC2, whereby the change range of the electrostatic capacitance value CC2F is determined. Then,
the capacitance value CVF2 of the variable capacitor element 651 is changed according to the
change of the acceleration of the vehicle, whereby the capacitance value CC2F of the composite
capacitor circuit 650 is changed within the change range. .
[0083]
The LPF 230 receives the analog audio signal PCS3 from the analog conversion unit 113, and
adjusts the cutoff frequency of the analog signal to be passed according to the change in the
acceleration of the vehicle along the traveling direction. The cut-off frequency changes in
response to changes in the capacitance values CC1F and CC2F of the composite capacitor circuits
620 and 650. In the present embodiment, the frequency band of the signal passing through the
LPF 230 changes as shown in FIG. That is, in the present embodiment, the cutoff frequency
moves to the high frequency side during acceleration, the frequency band of the signal to be
passed is broadened, and the cutoff frequency moves to the low frequency side during
deceleration, and the frequency band of the signal to be passed is It is getting narrower.
[0084]
Returning to FIG. 3, the volume adjustment unit 240 includes volume adjustment circuits (VL)
2411 to 2413 as volume adjustment means. Here, the volume adjustment circuits 2411 and
2412 perform adjustment to increase or decrease the power to the signals PLS1 and PLS2 sent
from the loudness circuits 2211 and 2122, that is, increase or decrease adjustment of the
volume, and the adjustment result is As AOS2, it outputs toward sound output units 1301 and
1302. Further, the volume adjustment circuit 2413 performs adjustment to increase or decrease
the power to the signal PLS3 sent from the low pass filter circuit 230, that is, the volume
increase or decrease adjustment, and the adjustment result is made to the sound output unit
130SW Directly output.
[0085]
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21
In the present embodiment, as shown in FIG. 13, the volume control circuit 241k (k = 1, 2, 3)
includes an amplifier 710 and a variable resistive element 720k. Further, the volume control
circuit 241 k includes a composite resistor circuit 730 k and an amplifier 740.
[0086]
Here, the signal input terminal of the amplifier 710 is connected to the loudness unit 220 or the
LPF 230 to receive the signal PLSk. Also, the signal output terminal of the amplifier 710 is
connected to the first terminal of the variable resistance element 720k. The second terminal of
the variable resistive element 720k is connected to the first terminal of the composite resistor
circuit 730k. Further, the second terminal of the composite resistor circuit 730k is grounded.
[0087]
Furthermore, the middle terminal of the variable resistance element 720 k is connected to the
signal input terminal of the amplifier 740. Then, the signal AOSk is output from the signal output
terminal of the amplifier 740 toward the sound output unit 130k.
[0088]
The volume adjustment command VLCk from the control processing unit 111 is supplied to the
variable resistance element 720k. Further, the complex resistance circuit 730k is supplied with
the clock signal CK5 from the clock generation unit 119 and the switch control signal SRCk from
the control processing unit 111. The switch control signals SRC1 to SRC3 are collectively
referred to as "switch control signal SRC".
[0089]
Here, the clock signal CK5 is composed of two clock signals CK51 and CK52 whose phases are
opposite to each other, and when one is at the significant level, the other is at the non-significant
level. The switch control signal SRC is composed of five individual switch control signals SRC1 to
10-04-2019
22
SRC5 (see FIG. 14).
[0090]
Amplifier 710 amplifies the power of signal PLSk from loudness unit 220 or LPF 230. The signal
thus amplified is output toward variable resistance element 720k.
[0091]
The variable resistor 720k can employ, for example, a slider type variable resistor. In this case,
the intermediate terminal moves in accordance with the volume adjustment command VLCk from
the control processing unit 111, whereby the division resistance values RVOL1k and RVOL2k of
the variable resistor 740k change.
[0092]
As shown in FIG. 14, the composite resistance circuit 730 k includes a switched capacitor circuit
731 k and four resistance elements 732 k 1 to 732 k 5. The composite resistance circuit 730k
also includes five switch elements 7331 to 7335.
[0093]
The switched capacitor circuit 731 k differs from the above-described switched capacitor circuit
311 ij in that the capacitance characteristic of the acceleration sensitive capacitor element to be
adopted is different, and that the clock signal CK 5 is supplied from the clock generation unit
119. Except for this, the configuration is the same as that of the switched capacitor circuit 311 ij.
This switched capacitor circuit 731k also operates as an acceleration sensitive resistance
element, similarly to the switched capacitor circuit 311ij.
[0094]
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23
The resistance elements 732 k 1 to 732 k 4 are connected in series or in parallel with the
switched capacitor circuit 731 k by opening and closing the switch elements 7331 to 7335.
Thus, the resistance value RVk of the composite resistor circuit 730k is determined by the circuit
configuration formed corresponding to the opening and closing of the switch elements 7331 to
7335.
[0095]
A corresponding individual switch control signal SRCr is supplied from the control processing
unit 111 to each of the switch elements 733r (r = 1 to 5). Then, each of the switch elements 733r
opens and closes in response to an individual opening and closing command by the individual
switch control signal SRCr.
[0096]
In the complex resistance circuit 730k configured as described above, the control processing unit
111 appropriately issues a switch open / close command by the switch control signal SRC,
whereby the change range of the resistance value RVk is determined. Then, when the resistance
value RVVk of the switched capacitor circuit 731k changes according to the change of the
acceleration of the vehicle, the resistance value RVOLk of the composite resistance circuit 730k
changes within the change range.
[0097]
The amplifier 740 amplifies the signal output from the middle terminal of the variable resistance
element 720i. The signal thus amplified is output as an audio output signal AOSk to the sound
output unit 130k.
[0098]
In the sound volume adjustment circuit 241k, since the switch circuit 731k equivalent to the
acceleration sensitive resistance element is a component of the complex resistance circuit 730k,
the power of the audio output signal AOSk increases or decreases according to the acceleration
10-04-2019
24
of the vehicle. In the present embodiment, the volume adjustment circuit 241k performs volume
adjustment in which the volume of the reproduced sound increases at the time of acceleration of
the vehicle and decreases at the time of deceleration.
[0099]
Returning to FIG. 2, the clock generation unit 119 is configured to include an oscillation circuit
(not shown) or the like that generates a clock signal of a constant cycle. The clock generation
unit 119 generates the clock signals CK1 to CK5 described above, and sends clock signals to the
equalizer unit 210, the loudness unit 220, and the volume adjustment unit 240, respectively. The
clock signals sent to the equalizer unit 210 are three types of CK1, CK2 and CK3, the clock
signals CK1 and CK2 are sent to the BPF 310ij, and the clock signal CK3 is sent to the switched
capacitor circuit 330ij. . The clock signal CK4 is sent to the loudness unit 220, and the clock
signal CK5 is sent to the volume adjustment unit 240.
[0100]
The control processing unit 111 exerts the function of the acoustic device 100 while controlling
the other components described above.
[0101]
The control processing unit 111 receives the setting request of the characteristic of the sound
adjustment processing input to the operation input unit 150 and directs the low-pass filter circuit
230 and the volume adjustment unit 240 to switch setting by the switch control signals SC1,
SC2, and SRC. Issue a command.
Here, the control processing unit 111 issues a switch setting command by the switch control
signals SC1 and SC2 toward the low pass filter circuit 230. Further, the control processing unit
111 issues a switch setting command to the sound volume adjustment unit 240 by the switch
control signal SRC.
[0102]
The control processing unit 111 is configured to issue a switch setting command by the switch
control signals SC1, SC2, and SRC in consideration of the detection result of the vehicle speed
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received via the speed sensor IF unit 160.
[0103]
In addition, the control processing unit 111 causes the display unit 140 to display a guidance
screen for supporting specification of audio content to be reproduced by the user.
Then, when a reproduction instruction specifying audio content is input from the operation input
unit 150, the control processing unit 111 controls the drive unit 120 to control data reading of
the reproduction content.
[0104]
Further, the control processing unit 111 controls the audio processing unit 112 to separate the
content data CTD into three channel processing signals PCD1 to PCD3.
[0105]
Also, the control processing unit 111 controls the volume adjustment unit 240 to adjust the
output volume from the speakers 1311 to 1313 of the sound output units 1301 to 1303.
When controlling the output volume, the control processing unit 111 generates a volume
adjustment command VLCk based on the volume specification input to the operation input unit
150, and sends it to the volume adjustment unit 240.
[0106]
[Operation] Next, the operation of the acoustic device 100 configured as described above will be
described focusing mainly on the operation of the acoustic adjustment processing of the analog
audio signal in the acoustic adjustment unit 114.
[0107]
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26
As a premise, it is assumed that a vehicle equipped with the acoustic device 100 is moving while
repeating acceleration and deceleration.
Further, in the audio device 100, it is assumed that audio reproduction is being performed in
accordance with a reproduction command input by the user to the operation input unit 150.
Furthermore, in the acoustic device 100, the user designates sound adjustment to the operation
input unit 150, and the control processing unit 111 receives the speed received via the speed
sensor IF unit 160 in addition to the sound adjustment specification. It is assumed that the switch
control signals SC1 and SC2 to the LPF 230 and the switch control signal SRC to the volume
adjuster 240 are processed in consideration of the detection result of the vehicle speed by the
sensor.
[0108]
The control processing unit 111 controls the drive unit 120 to read data of the audio content in
accordance with a reproduction instruction in which the user designates the audio content to the
operation input unit 150. The data thus read out is sent to the audio processing unit 112 as
content data CTD. The audio processing unit 112 having received the content data CTD separates
the content data CTD into three channel processing signals PCD1, PCD2, and PCD3 under the
control of the control processing unit 111.
[0109]
The channel processing signals PCD1, PCD2, PCD3 separated in this way are sent to the analog
conversion unit 113. The analog conversion unit 113 converts channel processing signals PCD1,
PCD2, PCD3 which are digital signals into analog audio signals PCS1, PCS2, PCS3 which are
analog signals. Then, these analog audio signals PCS1, PCS2, and PCS3 are sent to the sound
adjustment unit 114.
[0110]
The sound adjustment unit 114 automatically performs signal processing on the analog audio
signals PCS1, PCS2, and PCS3 for sound adjustment. Here, signal processing is performed on the
analog audio signals PCS1 and PCS2 in the equalizer unit 210, the loudness unit 220, and the
10-04-2019
27
volume adjustment unit 240. In addition, the low-pass filter circuit 230 and the volume adjuster
240 perform signal processing on the analog audio signal PCS3. (See Figure 3).
[0111]
At the time of such signal processing for sound adjustment, for the analog audio signals PCS1
and PCS2, first, the equalizer unit 210 adjusts the center frequency, the Q value, and the gain for
each frequency band divided into N bands. Here, signal processing is performed by the equalizer
circuit 2111 for the analog audio signal PCS1, and signal processing is performed by the
equalizer circuit 2112 for the analog audio signal PCS2.
[0112]
The signal processing by the equalizer circuit 211i (i = 1, 2) is performed for N bands, but the
center frequency of the jth (j = 1 to N) band is the switched capacitor of BPF 310 ij in the
individual equalizer circuit 212 ij It is determined by the ratio of the resistance value RV1Cij of
the circuit 311ij to the capacitance value CVCij of the variable capacitor element 312ij (see FIG.
6). Here, as described above, since the switched capacitor circuit 311 ij is equivalent to an
acceleration sensitive variable resistor and the variable capacitor element 312 ij is an
acceleration sensitive capacitor element, the resistance value RV 1 C ij and the capacitance value
C VC ij Changes according to the change in acceleration along the traveling direction of the
vehicle. For this reason, the center frequency of the j-th band changes in accordance with the
change in acceleration along the traveling direction of the vehicle.
[0113]
The Q value of the j-th band is determined by the ratio of the resistance value RV2Cij of the
switched capacitor circuit 315ij to the capacitance value CVCij of the variable capacitor element
312ij (see FIG. 6). Here, as described above, since the switched capacitor circuit 315ij is
equivalent to an acceleration sensitive variable resistor and the variable capacitor element 312ij
is an acceleration sensitive capacitor element, the resistance value RV2Cij and the capacitance
value CVCij are obtained. Changes according to the change in acceleration along the traveling
direction of the vehicle. For this reason, the Q value of the j-th band changes in accordance with
the change in acceleration along the traveling direction of the vehicle.
10-04-2019
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[0114]
Further, the gain adjustment of the signal of the j-th band in the individual equalizer circuit 212ij
is determined by the resistance value RVGij of the switched capacitor circuit 330ij with respect to
the resistance value RGij of the resistance element 320ij (see FIG. 5). Here, as described above,
since the switched capacitor circuit 330 ij is equivalent to an acceleration sensitive variable
resistor, the resistance value RVG ij changes in accordance with the change in acceleration along
the traveling direction of the vehicle. For this reason, the amplification factor of the signal of the
j-th band changes in accordance with the change of the acceleration along the traveling direction
of the vehicle.
[0115]
Thus, the signals adjusted by the N individual equalizer circuits 212 ij in accordance with the
acceleration / deceleration of the vehicle are sent to the adding unit 213 as the signal PBS ij. The
addition unit 213 receives and adds the analog audio signal PCSi and the signals PBSi1 to PBSiN.
The addition result is sent as the equalizer adjustment signal PESi to the loudness circuit 221i of
the loudness unit 220.
[0116]
The loudness circuit 221i that has received the equalizer adjustment signal PESi automatically
adjusts the degree of attenuation of the midrange in the reproduced sound. The attenuation in
the middle range changes according to the value of the resistance value RVLi of the switched
capacitor circuit 530i (see FIG. 8). Here, as described above, since the switched capacitor circuit
530i is equivalent to an acceleration sensitive variable resistor, the resistance value RVLi changes
in accordance with the change in acceleration along the traveling direction of the vehicle. For this
reason, the degree of attenuation of the midrange with respect to the equalizer adjustment signal
PESi changes in accordance with the change in acceleration along the traveling direction of the
vehicle.
[0117]
The signals whose mid-range attenuation is adjusted in the loudness circuits 2211 and 2212 in
this manner are sent as signal PLS1 and PLS2 to the volume adjustment circuits 2412 and 2412
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of the volume adjustment unit 240, respectively.
[0118]
The analog audio signal PCS3 is first sent from the analog conversion unit 113 to the LPF 230.
The LPF 230 adjusts the cut-off frequency of the signal to be passed according to the change in
the acceleration of the vehicle, and selectively passes the analog audio signal PCS3 below the cutoff frequency based on the adjustment result.
[0119]
The cutoff frequency is a value corresponding to the capacitance values CCF1 and CCF2 of the
composite capacitor circuits 620 and 650. These composite capacitor circuits 620 and 650 make
the acceleration sensitive variable capacitor elements 621 and 651 an essential element for
capacitance formation. Here, as described above, since the variable capacitor elements 621 and
651 are the acceleration sensitive capacitors and the capacitance values CCF1 and CCF2 change
according to the change of the acceleration along the traveling direction of the vehicle.
Therefore, the cut-off frequency of the LPF 230 changes in accordance with the change in
acceleration along the traveling direction of the vehicle.
[0120]
In the present embodiment, the cutoff frequency moves to the high frequency side at the time of
acceleration of the vehicle, and the cutoff frequency moves to the low frequency side at the time
of deceleration of the vehicle (see FIG. 12).
[0121]
In addition, rough values of electrostatic capacitance values CCF1 and CCF2 are obtained by the
ON / OFF setting of the switch elements in the composite capacitor circuits 620 and 650 in
accordance with the switch control command according to the switch control signals SC1 and
SC2 from the control processing unit 111. It is supposed to be decided.
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Therefore, in response to the ON / OFF setting of the switch element, the change range of the
electrostatic capacitance values CCF1 and CCF2 according to the change of the acceleration
along the traveling direction of the vehicle is determined. As a result, in the LPF 230, the change
range of the cutoff frequency is determined corresponding to the ON / OFF setting of the switch
element.
[0122]
Thus, the signal of which the signal of the frequency higher than the cutoff frequency is cut off in
the LPF 230 is sent as the signal PLS3 to the volume adjustment circuit 2413 of the volume
adjustment unit 240.
[0123]
The sound volume adjustment unit 240 receives the signals PFS1 and PFS2 from the loudness
unit 220, and receives the signal PFS3 from the low pass filter unit 230.
Then, the volume adjustment path 240 performs adjustment to increase or decrease the volume
of the signals PFS1 to PFS3. Here, the volume adjusting process for the signal PFSk (k = 1 to 3) is
performed by the volume adjusting circuit 241k.
[0124]
The volume increase / decrease rate of the volume adjustment circuit 241k is determined by the
ratio of the divided resistance value RVOL1k of the variable resistor 720k to the combined
resistance of the divided resistance value RVOL2k of the variable resistor 720k and the
resistance value RVk of the composite resistor circuit 730k. Here, as described above, since the
compound resistance circuit 730k is configured as an acceleration-sensitive variable resistor, the
resistance value RVk changes in accordance with the change in acceleration along the traveling
direction of the vehicle. For this reason, the volume increase / decrease rate in the volume
adjustment circuit 241k is adapted to change in accordance with the change in acceleration
along the traveling direction of the vehicle.
[0125]
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31
In the present embodiment, the volume change rate is increased at the time of acceleration of the
vehicle, and the volume change rate is decreased at the principle of the vehicle.
[0126]
Further, in accordance with the volume adjustment command VLCk from the control processing
unit 111, the division resistance values RVOL1k and RVOL2k of the variable resistor 720k are
determined.
As a result, in response to the volume adjustment command VLCk, a change range of the volume
increase / decrease rate according to the change of the acceleration along the traveling direction
of the vehicle is determined.
[0127]
The signals subjected to the automatic adjustment of the sound volume in the sound volume
adjustment unit 240 in this manner are sent as sound output signals AOS1, AOS2 and AOS3 to
the sound output units 1301, 1302 and 1303. And the reproduction | regeneration audio | voice
based on the adjustment result is output toward the sound field space from the speakers 1311
1312 1313.
[0128]
As described above, in the present embodiment, an acceleration sensitive capacitor element
manufactured by MEMS is used in a circuit that performs volume control. The capacitance value
of this capacitor element changes in accordance with the acceleration. As a circuit unit using this
capacitor element, there are an equalizer unit, a loudness unit, a low pass filter unit, and a
volume control unit. For this reason, in each of the circuit units, it is possible to automatically
perform sound adjustment according to the change in acceleration along the traveling direction
of the vehicle.
[0129]
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32
Further, in the present embodiment, the acceleration sensitive capacitor element doubles as the
acceleration sensor. For this reason, it is not necessary to separately provide a signal processing
circuit that analyzes the detection result by the acceleration sensor. Therefore, the circuit
configuration can be simplified.
[0130]
Further, in the present embodiment, since the sound adjustment is automatically performed
according to the movement of the vehicle, the entertainment property can also be improved.
[0131]
[Modification of Embodiment] The present invention is not limited to the above embodiment, and
various modifications are possible.
[0132]
For example, in the above embodiment, three speakers are provided, but sound may be output
from two or less speakers, or sound may be output from three or more speakers. it can.
[0133]
In the above embodiment, the equalizer unit 210, the loudness unit 220, the low pass filter unit
230, and the volume adjustment unit 240 are provided as a volume adjustment circuit that
employs an acceleration sensitive capacitor element as an element of the circuit. The
combination of the sound adjustment circuits in the above may be any.
[0134]
Further, the circuit configurations of the equalizer unit 210, the loudness unit 220, the low pass
filter unit 230, and the volume adjustment unit 240 described in the above embodiment are
merely examples, and other circuit configurations may be used.
[0135]
Further, the acoustic adjustment circuit constituting the acoustic adjustment unit 114 is not
limited to the components of the above embodiment, and, for example, as in the tone circuit, an
acoustic adjustment circuit using a capacitor element or a resistance element as an element of
the circuit The present invention can be applied.
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33
[0136]
Further, in the above embodiment, the low pass filter unit 230 includes the composite capacitor
circuits 620 and 650.
On the other hand, in the low-pass filter unit 230, only the variable capacitor element 621 may
be replaced with the composite capacitor circuit 620. Alternatively, the circuit configuration may
be replaced with the variable capacitor element 651 instead of the composite capacitor circuit
650. It may be
[0137]
Further, in the above embodiment, the volume adjuster 240 is provided with the composite
resistor circuit 730k.
On the other hand, in the sound volume adjustment unit 240, the composite resistor circuit 730k
may be replaced with a switched capacitor circuit 731k.
[0138]
Further, in the above embodiment, the composite resistance circuit is provided only in the
volume adjustment unit 240.
On the other hand, at least one of the switched capacitor circuits 311ij, 315ij, and 330ij
constituting the individual equalizer circuit 212ij may be replaced by a composite resistance
circuit, and the switched capacitor circuit 530i constituting the loudness circuit 221i may be a
composite resistance. It may be replaced by a circuit.
[0139]
In addition, although not explicitly shown in the above embodiment, an acceleration sensitive
capacitor element is adopted as necessary as a capacitor element constituting a high pass filter
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circuit that cuts low frequency components to an analog audio signal. A desired sound
adjustment may be performed.
[0140]
In the above embodiment, the acceleration sensitive capacitor element senses the acceleration
along the traveling direction of the vehicle, but may sense the acceleration in any direction.
[0141]
Moreover, in the above embodiment, the present invention is applied to an acoustic device
mounted on a vehicle, but the present invention can also be applied to an acoustic device
mounted on a mobile other than a vehicle. The present invention can be applied to a portable
telephone apparatus provided with a speaker, a game machine generating voice to be moved, and
the like.
[0142]
A central processing unit (CPU: Central Processing Unit), DSP (Digital Signal Processor), read only
memory (ROM: Read Only Memory), random access memory (RAM) Even if a part of the
processing in the above embodiment is executed by configuring a computer as an arithmetic unit
provided with a random access memory or the like and executing a prepared program by the
computer. Good.
This program is recorded on a computer-readable recording medium such as a hard disk, a CDROM, a DVD, etc., and is read from the recording medium and executed by the computer.
Also, this program may be acquired in the form of being recorded on a portable recording
medium such as a CD-ROM, a DVD or the like, or may be acquired in the form of delivery via a
network such as the Internet. It is also good.
[0143]
FIG. 1 is a block diagram schematically showing a configuration of an acoustic device according
to an embodiment of the present invention.
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35
It is a block diagram for demonstrating the structure of the control unit of FIG.
It is a block diagram for demonstrating the structure of the sound adjustment part of FIG.
It is a block diagram for demonstrating the structure of the equalizer circuit of FIG.
It is a figure for demonstrating the structure of the separate equalizer circuit of FIG. It is a figure
for demonstrating the structure of the band pass filter of FIG. It is a figure for demonstrating the
structure of the switched capacitor circuit of FIG. It is a figure for demonstrating the structure of
the loudness circuit of FIG. It is a figure for demonstrating the structure of the low-pass filter
circuit of FIG. FIG. 10 is a diagram (part 1) for illustrating the configuration of the composite
capacitor circuit in FIG. 9; FIG. 10 is a second diagram illustrating the configuration of the
composite capacitor circuit in FIG. 9; It is a figure for demonstrating the change of the cutoff
frequency according to the acceleration change of the low-pass filter circuit of FIG. It is a figure
for demonstrating the structure of the volume control circuit of FIG. It is a figure for
demonstrating the structure of the compound resistance circuit of FIG.
Explanation of sign
[0144]
DESCRIPTION OF SYMBOLS 100 ... Sound apparatus 111 ... Control processing part (1st control
means, 2nd control means) 114 ... Sound adjustment part (signal processing means) 119 ... Clock
generation part 1311-1313 ... Speaker 2111, 2112 ... Equalizer circuit (1st equalizer) Means,
second equalizer means) 2211, 2212 ... loudness circuit (loudness adjustment means) 230 ... low
pass filter circuit (low pass filter means) 2411 to 2413 ... volume adjustment circuit (volume
adjustment means) 311 ij ... switched capacitor circuit 312 ij, 353 ij ... acceleration Sensitive
capacitor elements 315 ij, 330 ij ... Switched capacitor circuit 5301 5302 ... Switched capacitor
circuit 620 ... Composite capacitor circuit 621 ... Acceleration sensitive capacitor circuit 6231 to
6235 ... Switch element 650 ... Composite capacitor Capacitor circuit 651 ... acceleration sensitive
capacitor circuit 6531 to 6535 ... switching elements 7301 to 7303 ... composite resistive 73117313 ... switched capacitor circuit 7331-7335 ... switching element
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36
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