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JPH0590857

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DESCRIPTION JPH0590857
[0001]
FIELD OF THE INVENTION The present invention relates to sound effect devices.
[0002]
[0002] Various sound quality control circuits such as resonance type, attenuation type, negative
feedback type, and filtering type have been used as a means for varying the frequency
characteristics of reproduced sound radiated from a speaker for several decades. In addition to
being put to practical use in receivers, television receivers, record playback devices, etc., it is also
possible to electrically correct the peaks and valleys on the frequency characteristics of the
speaker or to correct the acoustic characteristics of the listening room. The sound effect amplifier
is also conventionally used, and is controlled so as to change the frequency characteristic of the
reproduced sound in consideration of the characteristics of human hearing regarding volume and
frequency characteristics known as so-called Fletcher-Manson curve. Loudness control circuits
are also well known. The above-described conventional tone control circuit and sound effect
amplifier, etc., having the function of changing the frequency component of the sound signal to
change the timbre on the sense of hearing, are radio receivers, television receivers, various types
It is widely used in audio equipment, etc., and is useful for obtaining sounds that are easy to hear,
and the above-mentioned loudness control circuits have also been put to practical use where
various types of various types have been proposed. The
[0003]
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By the way, it is desirable that the reproduction sound radiated from the speaker in a radio
receiver, a television receiver, various audio equipment, etc. be preferably felt in terms of
hearing. When a small volume of reproduced sound was emitted from a speaker, it was a
problem that the feeling of rising of the sound tended to cause dissatisfaction, and a solution was
sought.
[0004]
SUMMARY OF THE INVENTION According to the present invention, there is provided a signal
rise detection means for detecting a sudden change in signal level in an acoustic signal, and an
output signal from the above signal rise detection means is of a predetermined size or more. And
an acoustic effect device comprising means for increasing the signal level of the acoustic signal
by a predetermined very short time, and a signal for detecting a sudden change of the signal level
in the acoustic signal. The output signal from the signal detection means, the means for
comparing the output signal from the signal detection means with a plurality of preset reference
values, the output signal from the signal detection means with the reference value When it
exceeds, the signal level of the above-mentioned acoustic signal is increased by a predetermined
amount corresponding to the reference value by a very short predetermined time. An acoustic
effect apparatus comprising: means for dividing an acoustic signal into a plurality of frequency
band signals; and a signal rise detection means for detecting a sudden change in signal level for
each signal in each frequency band; The output signal from the rising detection means of each
signal exceeds the reference value, and the means for comparing with a plurality of reference
values set in advance for each output signal from the rising detection means of each signal.
Means for increasing the signal level of the above-mentioned sound signal by a predetermined
amount corresponding to the reference value in a very short predetermined time. provide.
[0005]
A portion of the sound signal in which the signal level is suddenly changing is detected by the
signal rising detection means, and the above-mentioned sound signal is detected when the output
signal of the signal rising detection means is greater than a predetermined value. To increase the
attack sound of the reproduced sound by increasing the signal level of the signal by a
predetermined very short time.
Further, the output signal of the signal rise detection means is compared with a plurality of
reference values having different magnitudes, and the signal level of the above-mentioned
acoustic signal is determined in advance by a predetermined magnitude corresponding to each
reference value. Even better results can be obtained if the acoustic signal is divided into signals
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of a plurality of frequency bands, and detection of a sudden change in the signal level is
performed for each signal in each frequency band .
[0006]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the sound
effect apparatus of the present invention will be described in detail with reference to the
accompanying drawings.
FIG. 1 is a block diagram showing an embodiment of the sound effect apparatus according to the
present invention, FIG. 2 is a block circuit diagram showing a specific configuration example of
the rising edge detection unit, and FIGS. 3 and 4 are waveform diagrams for explaining the
operation. In FIG. 1, reference numeral 1 denotes an input terminal of an acoustic signal in the
acoustic effect device, and 2 denotes an output terminal of the acoustic signal in a state in which
signal processing for applying an acoustic effect is performed in the acoustic effect device. The
acoustic signal supplied to the input terminal 1 is input to the non-inverted input terminal of the
amplifier 8 and is also supplied to control signal generation circuits 3 to 7 for applying an
acoustic effect. In the amplifier 8 described above, the amount of negative feedback of the
negative feedback circuit configured between the output side and the inverting input terminal is
variable as described later, corresponding to the portion where the signal level in the acoustic
signal is suddenly changed. The output signal from the amplifier 8 is sent to the output terminal
2 as an output signal of the sound effect device.
[0007]
As the control signal generating circuit 3 (4, 5, 6, 7) for applying the above-mentioned acoustic
effect in the embodiment shown in FIG. 1, the band pass filter 31 (41, 51, 61, 71) is used. ,
Automatic signal level control circuit 32 (42, 52, 62, 72), rise detection unit 33 (43, 53, 63, 73),
and comparator 34 (44, 54, 64, 74). However, as a matter of course, one having a different
configuration may be used as the control signal generation circuit 3 (4, 5, 6, 7) for applying an
acoustic effect. The acoustic signal supplied to the input terminal 1 is supplied to the band pass
filters 31, 41, 51, 61, 71 in the control signal generating circuits 3, 4, 5, 6, 7 for providing the
acoustic effect, The control signal generation circuits 3, 4, 5, 6, 7 for applying the acoustic effects
of the second embodiment are signals of different frequency bands extracted by the band pass
filters 31, 41, 51, 61, 71 described above. Each of the control signal generation circuits 3 to 7 for
applying the acoustic effects generates control signals for applying acoustic effects on signals of
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different frequency bands.
[0008]
As a specific example of the frequency band of the signal to be processed in each of the control
signal generation circuits 3, 4, 5, 6 and 7 for applying each acoustic effect described above, for
example, control signal generation for applying the acoustic effect In the circuit 3, signals in the
frequency band of 125 Hz or less of the acoustic signal supplied to the input terminal 1 are
subjected to signal processing, and in the control signal generation circuit 4 for applying an
acoustic effect, the signal supplied to the input terminal 1 A signal in a frequency band of 125 Hz
to 500 Hz in an acoustic signal is subjected to signal processing, and in the control signal
generation circuit 5 for applying an acoustic effect, a signal in a frequency band of 500 Hz to 2
KHz in an acoustic signal supplied to the input terminal 1 In the control signal generation circuit
6 for applying an acoustic effect to the signal processing target, 2 A signal in the frequency band
of Hz to 6 KHz is targeted for signal processing, and in the control signal generation circuit 7 for
applying an acoustic effect, the signal in the frequency band of 6 KHz or more of the acoustic
signal supplied to the input terminal 1 is processed. As an example, the frequency band may be
divided with respect to the acoustic signal to be processed, such as being targeted. Also in the
following description of the embodiment of FIG. 1, the frequency bands of the signals to be
processed by the control signal generation circuits 3, 4, 5, 6, 7 for applying the acoustic effects
are the same as those described above. It is assumed that it is similar to the frequency band
shown in.
[0009]
The control signal generating circuits 3 to 7 for applying the acoustic effects shown in FIG. 1
have the same basic configuration in the respective circuits, and therefore, in the following
description, the control signal generating circuits 3 to 7 for applying the acoustic effects will be
described. In the case where description is made on common matters among the control signal
generation circuits 3 to 7 without distinction, the acoustic effect is applied without specifying the
control signal generation circuits 3 to 7 for applying acoustic effects. The configuration of the
control signal generation circuit for the circuit of FIG. The acoustic signals supplied from the
input terminal 1 to the control signal generating circuits 3 (4, 5, 6, 7) for applying the acoustic
effects are the control signal generating circuits 3 (4, 5, 5) for applying the acoustic effects. The
signals of different frequency bands extracted by the band pass filters 31 (41, 51, 61, 71)
respectively provided in 6, 7) are transmitted to the automatic signal level control circuit 32 (42,
52, 62, 72). ) Controls the signal level. The above-mentioned automatic signal level control circuit
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32 (42, 52, 62, 72) is provided for the purpose of absorbing the dispersion of the average level
of the input signal supplied thereto to a certain extent, and has a rapid rise (high It is configured
to be able to perform operations such as speed attack time) and long release time.
[0010]
In the above-mentioned automatic signal level control circuit 32 (42, 52, 62, 72), the signal in
the state where the variation in the average level of the input signal is removed is supplied to the
rise detection unit 33 (43, 53, 63, 73). Be done. FIG. 2 is a block circuit diagram showing a
specific configuration example of the rise detection unit 33 (43, 53, 63, 73), and the rise
detection unit 33 (43, 53, 63) shown in FIG. , 73), and input terminals a and output terminals b
of the rising detectors 33, 43, 53, 63 and 73 shown in FIG. 1 correspond to each other. It is a
thing. In the rise detection unit 33 (43, 53, 63, 73) illustrated in FIG. 2, BR is a both-wave peak
detection unit, CA is a charge buffer amplifier, DF is a differentiation circuit, and TA is a time
setting unit. In the double-wave peak detection unit BR, 9, 12 are amplifiers, 10, 11 are resistors,
and D1, D2 are diodes, and double-wave peak detection from the input terminal a of the rise
detection unit 33 (43, 53, 63, 73) The signal Sa exemplified in FIG. 4 (a) supplied to the part BR
is amplified by the amplifier 9 and then its positive wave portion is rectified by the diode D1, and
The wave is reversed in polarity by a circuit consisting of resistors 10 and 11 and an amplifier
12 and then rectified by a diode D2 to produce a signal Sb as shown in FIG. 4b.
[0011]
The signal Sb output from the both-wave peak detection unit BR is supplied to the non-inverted
input terminal of the amplifier 13 in the charge buffer amplifier CA. The output signal of the
amplifier 13 is supplied to the inverting input terminal of the amplifier 13, one end of the
capacitor C4 and one end of the resistor R12 through the diode D3, and is also supplied to the
capacitor C5 in the differentiating circuit DF. The other ends of the capacitor C4 and the resistor
R12 are grounded. Thus, the charge buffer amplifier CA to which the output signal Sb from the
both wave peak detection unit BR is given charges the capacitor C4 with an extremely short
charge time constant and then discharges the accumulated charge of the capacitor C4 through
the discharge resistor R12. Therefore, the terminal voltage of the capacitor C4, that is, the signal
supplied from the charge buffer amplifier CA to the differentiating circuit DF is the same as Sc
shown in (c) of FIG. Become. The differentiating circuit DF is composed of a capacitor C5, a
resistor R13, and a resistor of the time setting unit TA connected in parallel to the resistor R13
described above. The signal Sc as shown in c) is differentiated and output as a signal Sd as shown
in (d) of FIG.
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[0012]
The time setting unit TA charges the capacitor C7 with a voltage obtained by performing voltage
doubling rectification on the signal Sc supplied from the charge buffer amplifier CA to the
differentiation circuit DF by the voltage doubling rectification circuit including the capacitor C6
and the diodes D4 and D5. . The charge stored in the capacitor C7 is discharged according to the
time constant determined by the capacitor C7 and the resistor R14 connected in parallel thereto.
Thus, the transistor Q1 in which the terminal voltage of the capacitor C7 is supplied to the base
via the resistor 14 is in the on state only for the time width determined in relation to the time
constant determined by the capacitor C7 and the resistor R14. It will be done. When the
transistor Q1 is turned on, the base of the transistor Q2 is grounded via the collector / emitter of
the transistor Q1 turned on as described above, so the transistor Q2 is turned off. It is made to
the state. If a resistor having a sufficiently high resistance is used as the resistor 15 connected to
the collector of the transistor Q1 and the base of the transistor Q2, the differentiating circuit DF
when the transistor Q2 is turned off as described above The derivative time constant of is
substantially determined only by the capacitor C5 and the resistor R13, and the differential
operation in the differentiating circuit DF is performed substantially according to the derivative
time constant determined only by the capacitor C5 and the resistor R13. . Therefore, by
appropriately setting the time constant determined by capacitor C7 and resistor R14 in time
setting unit TA, signal Sc supplied from charge buffer amplifier CA to differentiation circuit DF
exhibits a rising slope over a long period of time. Even in the case of the state signal, the
reproduction sound can be a signal in a state where only a signal with a short attack feeling is
added, so that unnatural reproduction sound can be prevented from being generated.
[0013]
The signal Sd sent from the output terminal b of the rise detection unit 33 (43, 53, 63, 73) is
supplied to the comparator 34 (44, 54, 64, 74). The comparator 34 (44, 54, 64, 74) compares
the signal Sd input thereto with a predetermined reference voltage value, and in the case where
the input signal Sd is larger than the reference voltage value. Control signals are output from the
control signal generation circuit 3 (4, 5, 6, 7) for applying an acoustic effect. A plurality of
reference voltages V1, V2, V3... Are set as illustrated in FIG. 3 as the comparator 34 (44, 54, 64,
74) described above, and the input signal Sd is the reference voltage If the magnitude exceeds V1
but does not reach the reference voltage V2, the control signal is output to the connection line
341 (441 to 741), and the input signal Sd exceeds the reference voltage V2. If the magnitude
does not reach the reference voltage V3, the control signal is output to the connection line 342
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(442 to 742), and if the input signal Sd exceeds the reference voltage V3, the connection line
When the control signal can be output to 343 (443 to 743), the state of the attack signal can be
variably set according to the rising state of the acoustic signal. , Such a configuration is It is a
desirable embodiment. Then, as the comparator 34 (44, 54, 64, 74) in the embodiment
illustrated in FIG. 1, as described above with reference to FIG. 3, a plurality of set reference
voltages V1, V2 are set. , And V3... Are compared with the input signal Sd, and it is assumed that
a comparator having a configuration that can generate the control signal as described above
according to the comparison result is used.
[0014]
The control signals output from the control signal generation circuit 3 (4, 5, 6, 7) for applying
the above-mentioned acoustic effect are connected via connection lines 341, 342, 343, 441, 442
... 741, 742, 743. Switch control signal supply terminals 341T, 342T, 343T, 441T, 442T, 741T,
742T, 743T of the corresponding switches 17, 18, 19. The respective fixed contacts of the
switches 17, 18, 19... 25 are connected to the connection point between the resistor R1 and the
resistor R2 of the negative feedback circuit in the amplifier 8, and the switches 17, 18, 19 and 25
described above The movable contacts 19 to 25 are connected to a predetermined series
resonant circuit via individual resistors R3, R4, R5 to R11. In the embodiment shown in FIG. 1,
among the control signals output from the control signal generating circuit 3 for applying an
acoustic effect that generates a control signal corresponding to the signal component of the
frequency band of 125 Hz or less in the acoustic signal. The control signal applied to the switch
control signal supply terminal 341T of the switch 17 via the connection line 341 turns on the
switch 17 to connect the connection point between the resistor R1 and the resistor R2 of the
negative feedback circuit in the amplifier 8. A series resonance circuit is connected, which is
configured by a capacitor C1 and a coil L1 via a resistor R3 and whose resonance frequency is
100 Hz, for example.
[0015]
Also, among the control signals output from the control signal generating circuit 3 for applying
an acoustic effect that generates a control signal corresponding to the signal component of the
frequency band of 125 Hz or less in the acoustic signal, the switch via the connection line 342
The control signal applied to the 18 switching control signal supply terminals 342 T turns on the
switch 18 to connect the capacitor C 1 via the resistor R 4 to the connection point between the
resistors R 1 and R 2 of the negative feedback circuit in the amplifier 8. A series resonance
circuit composed of a coil L1 and configured to have a resonance frequency of, for example, 100
Hz is connected, and a control signal is generated corresponding to a signal component of a
frequency band of 125 Hz or less in an acoustic signal. Of the control signals output from the
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control signal generating circuit 3 for applying an acoustic effect, the switching control of the
switch 19 is performed via the connection line 343. The control signal applied to the signal
supply terminal 343T turns on the switch 19 to connect the resistor R1 of the negative feedback
circuit in the amplifier 8 and the resistor R2 from the capacitor C1 and the coil L1 via the resistor
R5. Thus, a series resonant circuit configured to have a resonant frequency of, for example, 100
Hz is connected.
[0016]
Next, among the control signals output from the control signal generation circuit 4 for applying
an acoustic effect that generates a control signal corresponding to the signal component in the
frequency band of 125 Hz to 500 Hz in the acoustic signal, the connection line 441 is used. The
control signal applied to the switching control signal supply terminal 441T of the switch 20
turns on the switch 20 to set a capacitor via a resistor R6 at the connection point between the
resistor R1 and the resistor R2 of the negative feedback circuit in the amplifier 8 A series
resonance circuit composed of C2 and a coil L2 and configured to have a resonance frequency of,
for example, 250 Hz is connected, and a control signal corresponding to a signal component in a
125 Hz to 500 Hz frequency band of an acoustic signal. Of the control signal output from the
control signal generation circuit 4 for applying an acoustic effect to generate The control signal
applied to the switching control signal supply terminal 442T of the reference numeral 21 turns
on the switch 21 to connect the capacitor C2 via the resistor R7 to the connection point between
the resistor R1 and the resistor R2 of the negative feedback circuit in the amplifier 8. A series
resonance circuit composed of a coil L2 and configured to have a resonance frequency of, for
example, 250 Hz is connected, and a control signal is generated corresponding to the signal
component of the 125 Hz to 500 Hz frequency band of the acoustic signal. Among the control
signals output from the control signal generation circuit 4 for applying the acoustic effect, the
control signal applied to the switching control signal supply terminal 443T of the switch 22
through the connection line 443 has the switch 22 turned on. From the capacitor C2 and the coil
L2 via the resistor R8 to the connection point between the resistor R1 and the resistor R2 of the
negative feedback circuit in the Ri, so as to connect the series resonant circuit configured to
resonate frequency becomes, for example 250 Hz.
[0017]
Similarly, a control signal output from the control signal generation circuit 5 for applying an
acoustic effect through the connection line to generate a control signal corresponding to the
signal component in the frequency band of 500 Hz to 2 KHz in the acoustic signal, and Control
signals and the like output from the control signal generation circuit 6 for applying an acoustic
effect through a connection line to generate a control signal corresponding to a signal
component in a frequency band of 2 KHz to 6 KHz in the acoustic signal are also shown in FIG. A
series resonance circuit (having an acoustic effect providing function) having a predetermined
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resonance frequency provided corresponding to each of the above-described switches is provided
by being applied to the switching control signal supply terminal of each corresponding switch
whose illustration is omitted. Series connected by a switch controlled on / off by a control signal
output from a control signal generation circuit 5 for The resonant frequency of the resonant
circuit is, for example, 1 KHz, and the resonant frequency of the series resonant circuit connected
by the switch controlled to be on or off by the control signal output from the control signal
generating circuit 6 for applying acoustic effects is, for example 4 KHz) is connected to the
connection point between the resistor R1 and the resistor R2 of the negative feedback circuit in
the amplifier 8 via a predetermined resistor.
[0018]
Among the control signals output from the control signal generating circuit 7 for applying an
acoustic effect that generates a control signal corresponding to the signal component in the
frequency band of 6 KHz or higher in the acoustic signal in FIG. The control signal applied to the
switching control signal supply terminal 741T of the switch 23 turns on the switch 23 to set the
capacitor C3 via the resistor R9 at the connection point between the resistor R1 and the resistor
R2 of the negative feedback circuit in the amplifier 8. A series resonance circuit composed of a
coil L3 and configured to have a resonance frequency of, for example, 10 KHz is connected, and a
control signal is generated corresponding to a signal component in a frequency band of 6 KHz or
more in an acoustic signal. Of the control signals output from the control signal generation
circuit 7 for applying an acoustic effect, switching control of the switch 24 via the connection
line 742 The control signal applied to the power supply terminal 742T turns on the switch 24 to
connect the resistor R1 and the resistor R2 of the negative feedback circuit in the amplifier 8
from the capacitor C3 and the coil L3 via the resistor R10. To connect a series resonance circuit
configured to have a resonance frequency of, for example, 10 KHz, and to generate a control
signal corresponding to a signal component in a frequency band of 6 KHz or more in the sound
signal. Among the control signals output from the control signal generation circuit 7, the control
signal applied to the switching control signal supply terminal 743T of the switch 25 via the
connection line 743 turns on the switch 25 to set the amplifier 8 The junction point between the
resistor R1 and the resistor R2 of the negative feedback circuit in the circuit is composed of the
capacitor C3 and the coil L3 via the resistor R11, and the resonant frequency is A series resonant
circuit configured to be 0 KHz is connected.
[0019]
As described above, when the circuit arrangement of the resistor and the series resonant circuit
is connected between the connection point of the resistor R1 and the resistor R2 of the negative
feedback circuit in the amplifier 8 and the ground by the switch turned on. The amplification
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factor of the amplifier 8 at the frequency component corresponding to the resonance
characteristic of the series resonance circuit described above is enhanced only during the period
when the switch is in the ON state.
The degree of enhancement of the amplification degree of the amplifier 8 when the abovedescribed switch is turned on increases as the resistance value of the resistors (for example, R3
to R11) connected in series to the series resonant circuit decreases. Become.
For example, assuming that resistance values R3 to R5 of the resistors R3 to R5 shown in FIG. 1
have a relation such as R3> R4> R5, the amplification degree of the signal component of the
frequency band of 125 Hz or less of the amplifier 8 Is larger when the switch 18 is turned on
than when the switch 17 is turned on, and is higher than when the switch 18 is turned on. Is
greater if the player is turned on.
The same applies to a circuit arrangement connected to another switch that enhances the
amplification of signals in other frequency bands.
[0020]
As in the embodiment shown in FIG. 1, the sound effect apparatus of the present invention is for
dividing the frequency band of the sound signal to be processed, and for providing the sound
effect for each of the plurality of divided frequency bands. When the present invention is
implemented by providing a control signal generation circuit, the present invention is
implemented by providing a control signal generation circuit for applying one acoustic effect
corresponding to the entire band of the acoustic signal to be processed. In this case, the rising
state of the reproduced sound can be made better than in the case of
Further, as described above with reference to FIG. 3, the comparator 34 (44, 54, 64, 74) in the
rise detection unit 33 (43, 53, 63, 73) has a plurality of reference voltages V1, V2,. When
configured to perform comparison with V3 ..., the state of the attack signal can be variably set
according to the state of rise of the acoustic signal, so the comparison in the comparator is
compared with a single reference voltage It is a desirable embodiment compared with the case
where it carries out as a thing of such a configuration aspect.
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[0021]
As is apparent from the details described above, according to the sound effect apparatus of the
present invention, the portion in which the signal level in the sound signal is suddenly changing
is detected by the signal rising detection means, When the output signal of the rise detection
means is greater than a predetermined level, the signal level of the above-mentioned sound
signal can be increased by a very short predetermined time to enhance the attack of the
reproduced sound. And comparing the output signal of the signal rise detection means with a
plurality of reference values having different magnitudes, and predetermining the signal level of
the acoustic signal described above by a magnitude determined in advance corresponding to
each reference value. Better results can be obtained if the acoustic signal is divided into signals of
a plurality of frequency bands so as to increase for a very short time, and detection of abrupt
change in signal level is performed for each signal of each frequency band. It is and than, the
conventional problems described above, according to the sound effect device of the present
invention can be satisfactorily solved.
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