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DESCRIPTION JP2007295194

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DESCRIPTION JP2007295194
The present invention provides an "amplifier" capable of muting or significantly reducing rattle
noise generated in a speaker to which vibration, impact or the like is applied when not listening
to audio, that is, when the speaker is not sounded. An amplification unit (13) for amplifying an
audio signal output from an audio device (7) and a positioning signal representing the vibration
of a speaker (15) connected to the amplification unit (13) are input. The control unit 9 performs
feedback control of the amplification unit 13 according to the positioning signal regardless of
whether it is off, the feedback circuit unit 19, and the MFB control unit 21. [Selected figure]
Figure 1
Amplifier
[0001]
The present invention relates to an amplifier for driving a speaker, and more particularly to an
amplifier for reducing rattle noise of a speaker generated due to vibration of a vehicle body
during traveling.
[0002]
When a car travels, a diaphragm of a speaker mounted on a door or the like of a vehicle body
shakes due to vibration, impact or the like received from the ground or the like, so-called rattle
noise (hereinafter referred to as rattle noise).
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) Occurs. Originally, in view of the fact that the diaphragm of the speaker vibrates and the sound
is output, such rattle sound is anxious when using music and the like while using an audio device
while traveling It was not a thing.
[0003]
However, in recent years, with the improvement of the performance of cars, especially luxury
cars, the vibration and impact of the car body have been reduced, and the noise in the cabin has
been greatly reduced. Therefore, when the audio device is not used during traveling, that is, in a
situation where no sound is output from the speaker, rattle sound generated by the vibration of
the speaker, particularly the large subwoofer of the diaphragm becomes offensive.
[0004]
In order to solve such a problem, for example, a motional feedback device (hereinafter, referred
to as MFB) is known. The MFB device detects the vibration of the diaphragm of the speaker, and
the detected data is referred to as a predetermined gain (hereinafter referred to as a feedback
amount). And the feedback to the voice signal as a feedback signal, and has, for example, the
configuration shown in FIG.
[0005]
FIG. 3 is a block diagram showing an example of the MFB device 37. As shown in FIG. According
to such a configuration, first, an audio signal from the audio input signal source 27 of an audio
device or the like is amplified by the amplification unit 29 and provided to the speaker 31.
[0006]
A vibration sensor 33 is attached near the diaphragm of the speaker 31 to detect vibration
acceleration of the speaker and convert it into a voltage. The output from the vibration sensor 33
is given to the feedback circuit unit 35. If the vibration sensor 33 detects, for example, the
velocity of the diaphragm of the speaker, the feedback circuit unit 35 generates a velocity signal,
an acceleration signal obtained by differentiating the velocity signal, and a position signal
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(amplitude) obtained by integrating the velocity signal. , Change the gain and phase of these
signals to output a feedback signal. The output of the feedback circuit unit 35 is given to the
amplification unit 29 as a feedback signal.
[0007]
With such a configuration, it is possible to control the amplitude and phase of the audio signal
that the feedback signal inputs to the amplification unit 29, compensate the reproduction
characteristics in the bass part, and correct the distortion of the high-pitched part .
[0008]
Further, according to Patent Document 1, a digital signal processor to which an audio signal
(original sound data) is input compares the audio signal and the feedback signal, calculates a
difference value, adds or subtracts the difference value to the original sound data, By making
corrections, the original sound is faithfully reproduced.
JP 2005-323204 A
[0009]
However, in the above-described MFB device 37, the feedback circuit unit 35 only corrects the
amplitude by increasing the fixed fixed (weak) feedback amount, and controls the diaphragm of
the speaker 31. In this case, the amount of feedback was insufficient, so the diaphragm moved
somewhat, and rattle noise could not be completely prevented.
[0010]
Moreover, the feedback amount can be increased when the power of the input signal source 27
is on, and when the audio device is not used during traveling, that is, the power of the input
signal source 27 is off. Below, the MFB device 37 did not operate, and it was not possible to mute
or reduce rattle noise.
[0011]
The present invention has been made in view of the above problems, and mutes or significantly
reduces rattle noise generated in a speaker to which vibration, impact or the like is applied when
the user does not listen to audio, that is, when the speaker is not sounded. It is an object of the
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present invention to provide an amplification device capable of
[0012]
In order to solve the above-mentioned problems, the amplification device of the present
invention receives an amplification unit for amplifying an audio signal output from an audio
device and a positioning signal representing the vibration of a speaker connected to the
amplification unit. The audio device may further include a control unit that performs feedback
control of the amplification unit according to the positioning signal when the power of the audio
device is on and off.
[0013]
With such a configuration, even if the power supply of the audio device is off, feedback control
can be performed on the amplification unit, and positional deviation of the diaphragm of the
speaker can be suppressed.
[0014]
Further, the present invention is characterized in that the control unit sets different feedback
amounts depending on whether the power of the audio device is on or off.
With such a configuration, it is possible to change the feedback amount of the feedback signal to
be output depending on whether or not the audio apparatus is powered on, and to suppress
positional deviation according to the degree of vibration of the diaphragm of the speaker.
become able to.
[0015]
Further, the present invention is characterized in that the control unit sets a feedback amount
when the power of the audio device is off larger than a feedback amount when the power of the
audio device is on.
With such a configuration, even when the power of the audio device is turned off, it is possible to
output a feedback signal having a large feedback amount, and it is possible to strongly control
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the vibration of the diaphragm of the speaker.
[0016]
Further, the present invention is characterized in that the amplification device operates based on
power supplied from a battery when accessory power is on.
With such a configuration, even if the power supply of the audio device is off, the power from the
battery can be supplied to the amplification device, and the diaphragm of the speaker can be
controlled.
[0017]
According to the amplification device of the present invention, even when the power of the audio
device is off, the control unit can be moved by the power supplied from the battery, and as a
result, the feedback circuit unit can be controlled.
Furthermore, even when the power of the audio device is turned off, the controller can change
the feedback amount of the feedback signal, thereby suppressing the diaphragm of the speaker
and preventing rattling noise.
[0018]
Hereinafter, embodiments of the present invention will be specifically described with reference to
the drawings.
[0019]
FIG. 1 is a block diagram of an amplification device 1 according to an embodiment of the present
invention.
In FIG. 1, the amplification device 1 amplifies the audio signal output from the audio device 7 and
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increases the feedback amount when the positioning signal from the amplification unit 13 and
the vibration sensor 17 is output. It has a feedback circuit unit 19 that outputs a feedback signal,
and an MFB control unit 21 that controls and corrects an audio signal based on the output
feedback signal.
The audio device 7 is a device such as a tuner, a tape deck, a CD (Compact Disk) player, an MD
(Mini Disk) player, etc., and is a device that outputs a radio, music, etc. from the speaker into the
car.
[0020]
The feedback circuit unit 19 includes a switch SW controlled by the control unit 9 and resistors
R1 and R2 arranged in parallel with the switch SW and having different resistance values. For
example, when the resistance value of R1 is larger than the resistance value of R2 and the power
supply of the audio device 7 is on, the switch SW selects a high resistance value R1 that outputs
a small feedback amount. On the other hand, when the power of the audio device 7 is turned off,
it is configured to switch to select a low resistance value R2 that outputs a large feedback
amount. The magnitude of the resistance value of the resistor R1 is preferably about twice the
magnitude of the resistance value of the resistor R2.
[0021]
The controller 9 detects an on / off signal output from the audio device 7 whether the power of
the audio device 7 is on or off. Then, the control unit 9 controls switching of the switch SW of the
feedback circuit unit 19. Moreover, the amplification device 1 is abbreviated as an accessory
power supply 3 (hereinafter referred to as an ACC power supply). Connected to the ACC
detection unit 5 that detects whether the power is on or off, and the power output from the
battery 23 is connected to the control unit 9 or the MFB control unit 21 when the ACC power
supply 3 is on. , And a semiconductor switch 25 such as a transistor which is switched to be
supplied to the amplification unit 13 and the vibration sensor 17. With such a configuration,
power is supplied from the battery 23 to the amplification device 1 by turning on / off the ACC
power supply 3.
[0022]
Regarding the above-described amplification device 1, for example, the operation when the
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power of the audio device 7 is on and the ACC power supply 3 is on will be described.
[0023]
First, since the ACC power supply 3 (accessory: accessory power supply) is on, the ACC detection
unit 5 detects that the ACC power supply 3 is on.
As a result, the semiconductor switch 25 connected to the ACC detection unit 5 is switched to
supply the power from the battery 23 to the control unit 9, the MFB control unit 21, the
amplification unit 13 and the vibration sensor 17.
[0024]
On the other hand, the audio signal output from the audio device 7 is transmitted to the
amplification unit 13 via the volume 11 for adjusting the volume of the audio device 7
appropriately formed and the MFB control unit 21. The amplification unit 13 amplifies the input
audio signal and outputs the audio signal from the speaker 15.
[0025]
Although an audio signal is output by the speaker 15, there is a possibility that positional
deviation of the diaphragm may occur along with the output. The displacement of the diaphragm
caused by the vibration is detected by the vibration sensor 17. The vibration sensor 17 measures
the displacement of such a diaphragm and transmits it to the feedback circuit unit 19 as a
positioning signal.
[0026]
In the feedback circuit unit 19, the switch SW is switched to select a resistor with a large
resistance value by the control unit 9 that has received an on / off signal indicating that the
power of the audio device 7 is on. Thereby, the feedback circuit unit 19 outputs a feedback signal
with a small feedback amount to the MFB control unit 21 based on the input positioning signal.
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[0027]
The output feedback signal is added to or subtracted from the audio signal input to the MFB
control unit 21. As a result, the audio signal obtained by adding / subtracting the feedback signal
is amplified by the amplification unit 13 and then output to the speaker 15. However, since the
feedback signal is added, the displacement of the diaphragm of the speaker 15 is offset. Are
controlled to be directed to the zero reference point.
[0028]
Next, the operation when the power of the audio device 7 is off and the ACC power supply 3 is on
will be described.
[0029]
Since the ACC power supply 3 is on as in the case where the power of the audio device 7 is on,
the ACC detection unit 5 detects that the ACC power supply 3 is on.
The semiconductor switch 25 connected to the ACC detection unit 5 is switched to supply the
power from the battery 23 to the control unit 9, the MFB control unit 21, the amplification unit
13 and the vibration sensor 17.
[0030]
On the other hand, since the power of the audio device 7 is off, an on / off signal indicating that
the power of the audio device 7 is off is output to the control unit 9. Based on this, the control
unit 9 switches the switch SW toward the feedback circuit unit 19 toward the resistor having a
lower resistance value, for example, R2 if R1> R2.
[0031]
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The feedback circuit unit 19 set in this manner outputs a feedback signal having a large feedback
amount to the MFB control unit 21 based on the positioning signal, and outputs the feedback
signal to the speaker 15 via the amplification unit 13. The speaker 15 controls the displacement
of the diaphragm of the speaker 15 to be a zero reference point based on the feedback signal.
[0032]
As described above, when the power supply of the ACC power supply 3 is on, the feedback signal
is output from the feedback circuit unit 19 regardless of the power on / off of the audio device 7
and the displacement of the diaphragm of the speaker 15 is controlled. It will be done. When the
power supply of the ACC power supply 3 is turned off, the above-described operation is not
performed.
[0033]
Further, the operation of the control unit 9 will be described with reference to a flowchart. The
flowchart described in FIG. 2 is realized by a processing device such as a CPU or a program
executed there, and a storage device such as a hard disk.
[0034]
The control unit 9 receives an on / off signal from the audio device 7 (S101), and determines
from the on / off signal whether the power of the audio device 7 is off (S102). When the power
of the audio device 7 is off (S102; Yes), the feedback circuit unit 19 is controlled to switch the
switch SW to a resistor with a low resistance value (S103), and the vibration sensor 17 outputs
The received positioning signal is output as a feedback signal to the MFB control unit 21 (S104).
On the other hand, when the power of the audio device 7 is not turned off, that is, when the
power is turned on (S102; No), the switch SW is switched to a resistor having a resistance value
higher than that of the feedback circuit unit 19. (S105), and the positioning signal output from
the vibration sensor 17 is output as a feedback signal to the MFB control unit 21 (S104).
[0035]
As described above, the control unit 9 controls the diaphragm of the speaker 15 by changing the
feedback amount of the feedback circuit unit 19 by turning on / off the power supply of the
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audio device 7.
[0036]
Furthermore, the present invention is not limited to the above-described embodiment, and
various modifications can be made without departing from the scope of the invention.
For example, the control unit 9 can be configured to be included in the audio device 7 or
disposed outside the amplifier device 1 instead of the inside of the amplification device 1.
[0037]
Further, as the vibration sensor 17, any of non-contact type and contact type vibration sensors
can be used. When a vibration sensor by laser light is used as a non-contact vibration sensor, the
physical force is applied to the diaphragm of the speaker 15 by irradiating the laser light near
the center of the speaker 15 and detecting the vibration of the speaker 15 Vibration can be
detected without Moreover, when using a contact-type vibration sensor, it is preferable to
perform attachment so that resonance with the vibration of a speaker may not occur, or to use a
speaker incorporating an acceleration sensor.
[0038]
As described above, in the amplification device according to the present invention, even when the
power of the audio device is off, the feedback amount of the feedback signal can be increased,
the diaphragm of the speaker can be controlled, and the rattle noise can be prevented. The
potential for industrial use is high.
[0039]
1 is a block diagram of an MFB apparatus according to an embodiment of the present invention.
It is a flowchart which shows operation | movement of a control part. It is a block diagram of the
conventional MFB apparatus.
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Explanation of sign
[0040]
Reference Signs List 1 amplification device 3 ACC power supply 5 ACC detection unit 7 audio
device 9 control unit 11 volume 13, 29 amplification unit 15, 31 speaker 17, 33 vibration sensor
19, 35 feedback circuit unit 21 MFB control unit 23 battery 25 semiconductor switch 27 input
signal Source 37 MFB device
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