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JP2007086109

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DESCRIPTION JP2007086109
A speaker device for musical instrument is provided which performs MFB processing that can
appropriately reproduce musical instrument sound. An output of a sensor (45) is amplified to a
predetermined level by a head amplifier (24) and input to a filter (25). The filter 25 is a
secondary differential filter, and acquires acceleration from the displacement of the voice coil 41
detected by the sensor 45. This is because the sound pressure characteristic of the cone speaker
is proportional to the acceleration of the cone. The output of the filter 25 is adjusted to an
arbitrary level by the player operating the MFB level adjustment volume 28 and input to the
input terminal of the voltage control amplifier 26. The voltage control amplifier 26 is an
amplifier whose amplification factor is controlled to amplify a signal input to the input terminal
by a voltage value supplied to the control terminal. [Selected figure] Figure 4
Loudspeaker device for musical instruments
[0001]
The present invention relates to a speaker device for a musical instrument that detects a
displacement of a voice coil of a speaker and performs feedback processing.
[0002]
In an audio speaker device, a displacement of a voice coil of a speaker, a displacement of a center
cap, and the like are detected, and the detected displacement is taken as a negative feedback to
obtain a difference value from an input signal, and the difference value is amplified by an
amplifier. Motional feedback (hereinafter referred to as MFB) for driving a loudspeaker is known.
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1
[0003]
It is known that this MFB processing can considerably improve the non-linear movement of the
speaker.
In JP-A-10-276492 (patent document 1), in the MFB speaker apparatus, the detected
displacement and the output of the filter to which the audio signal is supplied are averaged to
shift the center of the vibration displacement of the voice coil. There is disclosed that no
abnormal noise occurs.
Japanese Patent Application Laid-Open No. 10-276492
[0004]
However, in the conventional MFB speaker apparatus, although the movement of the non-linear
speaker can be improved, there is a problem that it is not possible to set characteristics such as
the tone color of the actively generated tone like the speaker for musical instruments. .
[0005]
Also, with conventional musical instrument speakers, when playing an instrument that generates
a lot of bass such as a bass guitar or an instrument with a wide range such as a piano, the voice
coil of the speaker or the speaker when playing a low range. Due to the large mechanical
amplitude of the cone paper, non-linear distortion may occur or the strong sound may be
overrun, and the expression of strength and weakness may not be sufficiently performed.
Therefore, the performer had to take extra care such as playing more strongly to improve the
tone generated by his performance, causing stress.
[0006]
The present invention has been made to solve the above-mentioned problems, and it is an object
of the present invention to provide a speaker device for musical instrument that performs MFB
processing that can appropriately reproduce musical instrument sound.
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[0007]
In order to achieve the above object, a speaker device for musical instrument according to claim
1 of the present invention comprises an input terminal for inputting an electric signal, and a
preamplifier for changing frequency characteristics of the electric signal inputted to the input
terminal; A speaker driven by an amplifier, feedback means for detecting displacement of the
speaker, and for feeding back the detected signal to the amplifier, and an electric signal
corresponding to an output of the preamplifier and a feedback signal fed back by the feedback
means. An amplifier for amplifying the signal, the apparatus comprising: feedback amount setting
means for arbitrarily setting the amount of feedback signal fed back by the feedback means, the
amplifier comprising an output of the preamplifier and the feedback amount setting means The
electric signal is amplified in accordance with the feedback signal of the set feedback amount.
[0008]
The speaker apparatus for musical instruments according to claim 2 is the speaker apparatus for
musical instruments according to claim 1, further comprising: level detecting means for detecting
an output level of the preamplifier, wherein the feedback amount setting means is detected by
the level detecting means. The amount of feedback is set according to the level.
[0009]
The loudspeaker apparatus for musical instruments according to claim 3 is the loudspeaker
apparatus according to claim 2, further comprising: a low pass filter for passing low frequency
components of the output of the preamplifier, and the level detection means detects an output
level of the low pass filter. It is
[0010]
The speaker apparatus for musical instruments according to claim 4 is the speaker apparatus for
musical instruments according to claim 2 or 3, further comprising sense adjusting means for
arbitrarily adjusting the value of the output level of the preamplifier detected by the level
detecting means, The feedback amount setting means sets the feedback amount according to the
value of the level detected by the level detection means being adjusted by the sense adjustment
means.
[0011]
The speaker apparatus for musical instruments according to claim 5 is the speaker apparatus
according to any one of claims 1 to 4, further comprising: a volume operator for arbitrarily
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setting the volume of the sound output from the speaker, the feedback amount setting means Is
to set the feedback amount according to the operation amount set by the volume operator.
[0012]
The musical instrument speaker apparatus according to claim 6 is the musical instrument
speaker apparatus according to any one of claims 1 to 5, wherein the preamplifier includes an
equalizer operator for arbitrarily setting the levels of a plurality of frequency bands. The
feedback amount setting means sets the feedback amount in accordance with the operation
amount set by the equalizer operator.
[0013]
The musical instrument speaker apparatus according to claim 7 is the musical instrument
speaker apparatus according to any one of claims 1 to 6, wherein the speaker comprises a voice
coil having a reflection plate at a cylindrical central portion, and the reflection plate The light
source includes a light source for emitting light and a light receiving element for receiving the
light reflected by the reflection plate.
[0014]
According to the speaker device for musical instrument of the present invention, the apparatus
comprises the feedback amount setting means for arbitrarily setting the amount of feedback
signal fed back by the feedback means, and the amplifier is the feedback set by the output of the
preamplifier and the feedback amount setting means. Since the electric signal is amplified
according to the amount of feedback signal, the non-linear distortion of the musical tone output
from the speaker can be reduced and the feedback amount can be set arbitrarily. By setting the
degree or the like, there is an effect that it can be set to the tone color intended by the player.
[0015]
According to the speaker apparatus for musical instrument of the second aspect, in addition to
the effects of the speaker apparatus for musical instrument of the first aspect, the apparatus
further comprises level detecting means for detecting the output level of the preamplifier, and
the feedback amount setting means is the level detecting means Since the amount of feedback is
set according to the level detected by the above, there is an effect that the amount of feedback
can be changed according to the output level of the preamplifier.
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For example, when the output level of the preamplifier is large, if there is no margin in the
performance of the amplifier even if the amount of feedback is increased, electrical distortion of
the amplifier may be generated.
Therefore, in this case, the feedback amount may be reduced when the output level of the
preamplifier is large, and the feedback amount may be increased when the output level of the
preamplifier is small.
On the other hand, if there is a margin in the performance of the amplifier, it is possible to widen
the dynamic range and widen the performance expression by increasing the feedback amount
when the output level of the preamplifier is large.
[0016]
According to the speaker device for musical instrument of the third aspect, in addition to the
effect of the speaker device of the second aspect, the low-pass filter for passing the low
frequency component of the output of the preamplifier is provided, and the level detection means
Since the level is detected, there is an effect that the feedback amount can be set according to the
level of the bass which is particularly effective in the MFB processing.
[0017]
According to the speaker device for musical instrument of the fourth aspect, in addition to the
effect of the speaker device for musical instrument of the second aspect or the third aspect, sense
adjustment means for arbitrarily adjusting the value of the output level of the preamplifier
detected by the level detection means The feedback amount setting means sets the feedback
amount according to the value adjusted by the sense adjustment means, and the value of the
level detected by the level detection means sets the feedback amount according to the value of
the output level of the preamplifier. The ratio (sensitivity) of the feedback amount to be set can
be set arbitrarily, and there is an effect that the feedback amount according to the value of the
output level of the preamplifier intended by the player can be obtained.
[0018]
According to the speaker device for musical instrument of the fifth aspect, in addition to the
effect of the speaker device according to any one of the first to fourth aspects, a volume operator
for arbitrarily setting the volume of the sound output from the speaker is provided. Since the
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feedback amount setting means sets the feedback amount according to the operation amount set
by the volume operator, the feedback amount can be set by the value of the volume set by the
volume adjustment means. is there.
For example, when the output level is set large by the volume, the feedback amount can be set
small, and when the output level is set small by the volume, the feedback amount can be set
large.
[0019]
According to the speaker device for musical instrument of the sixth aspect, in addition to the
effect exhibited by the speaker device for the musical instrument according to any of the first to
fifth aspects, the preamplifier sets the levels of the plurality of frequency bands arbitrarily. A
controller is provided, and the feedback amount setting means sets the feedback amount in
accordance with the operation amount set by the equalizer operator. Therefore, the feedback
amount is set by the value of the equalizer set by the equalizer adjustment means. Has the effect
of
For example, when it is set by the equalizer adjustment means to increase the level in the low
band, the feedback amount is reduced, and when it is set by the equalizer adjustment means to
decrease the level in the low band, the feedback amount is set. Settings such as enlargement can
be made.
[0020]
According to the speaker device for musical instrument of the seventh aspect, in addition to the
effect of the speaker device for musical instrument according to any of the first to sixth aspects,
the speaker has a voice coil having a reflection plate at the center of the cylindrical shape Since
the light source for emitting light toward the reflecting plate and the light receiving element for
receiving the light reflected by the reflecting plate are provided, the voice coil is provided as
compared with the case where the reflecting plate is provided in the center cap of the speaker.
There is an effect that the displacement due to the vibration of can be accurately detected.
[0021]
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Hereinafter, preferred embodiments of the present invention will be described with reference to
the accompanying drawings.
FIG. 1 is a block diagram showing an electrical configuration of a musical instrument speaker
device 1 according to an embodiment of the present invention.
The musical instrument speaker device 1 includes an input terminal (input), a preamplifier unit
10, a feedback unit 20, a power amplifier unit 30, and a speaker unit 40.
The line output of an electric guitar, an electric base, an electronic keyboard, an electronic piano,
etc. is mainly connected to the input terminal 51 (see FIG. 2) by a connection cord.
[0022]
The electric signal input to the input terminal is adjusted in frequency characteristic and level by
the preamplifier unit 10, and is output to the feedback unit 20.
The feedback unit 20 receives the output of the preamplifier unit 10 and the sensor output
outputted by the sensor 45 (see FIG. 3) for detecting the displacement of the voice coil 41 (see
FIG. 3) provided in the speaker unit 40. And processes the output of the signal to the power
amplifier unit 30.
[0023]
The power amplifier unit 30 performs power amplification for driving the speaker unit 40 and
outputs the output of the feedback unit 20 to the speaker unit 40.
In the speaker unit 40, the voice coil vibrates in accordance with the power supplied from the
power amplifier unit 30 to generate musical tones, and the mechanical vibration of the voice coil
41 is detected by the sensor 45.
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[0024]
Next, with reference to FIG. 2, the operation panel 50 of the musical instrument speaker device 1
will be described.
FIG. 2 is an operation panel diagram showing the operation panel 50 of the musical instrument
speaker device 1.
In the operation panel 50, the feedback amount of the output of the sensor 45 is adjusted, the
input terminal 51, the base adjustment knob 52 which is the operation element of the equalizer
12 for adjusting the frequency characteristic, the middle adjustment knob 53, the treble
adjustment knob 54 Dynamics for adjusting the detected output level of the preamplifier unit 10
when detecting the level of the output of the MFB level adjustment knob 55 and the preamplifier
unit 10 and changing the feedback amount of the output of the sensor 45 according to the level
A sense knob 56 and a volume knob 57 for adjusting the volume are provided.
[0025]
The input terminal 51 is formed by an input jack, and a plug to which the output of the musical
instrument is connected is detachably mounted. The base adjustment knob 52, the middle
adjustment knob 53, and the treble adjustment knob 54 are for adjusting the levels of the low
frequency range, the middle frequency range, and the high frequency range of the frequency
characteristics adjusted by the equalizer 12, respectively. The rotary variable resistor shaft is
fixed to these knobs, and the level of each band is adjusted by changing the resistance value of
the variable resistor. Similarly, the axes of the rotary variable resistors are fixed to the MFB level
adjustment knob 55, the dynamics sense knob 56, and the volume knob 57, and their respective
values are adjusted by changing the resistance value of the variable resistors.
[0026]
Next, the speaker unit 40 will be described with reference to FIG. FIG. 2 is a cross-sectional view
showing a cross section of the speaker unit 40. As shown in FIG. The speaker unit 40 is a speaker
of a type called a cone speaker, and mainly includes the voice coil 41, the cone paper 42, the
magnet 43, the reflection plate 44, the sensor 45, the suspension 47, the frame 48 and the like. It
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is configured.
[0027]
The voice coil 41 is formed in a cylindrical shape, and is arranged so as to be capable of
oscillating along the axis of the cylinder in the magnetic field formed by the magnet 43. The
electric power supplied from the power amplifier unit 30 causes a current to flow through the
voice coil 41, and the voice coil 41 vibrates according to the current. A cone 42 is fixed to the
voice coil 41 and vibrates as the voice coil 41 vibrates, and a tone is generated by vibrating the
cone 42 air. The voice coil 41 and the cone paper 42 are held by the suspension 47 at the center
of the frame 48 which forms the outer periphery of the speaker unit 40.
[0028]
A center cap 46 is formed on the central portion of the cone paper 42 so as to cover the voice
coil 41. A reflective plate 44 for reflecting light is formed on the side of the cylindrical voice coil
41 close to the center cap 46, and is formed to be displaced according to the vibration of the
voice coil 41.
[0029]
The central portion of the cylindrical magnet 43 has a cylindrical space concentric with the
magnet 43, and on the extension of the cylindrical space, light is directed toward the reflecting
plate 44 at a position facing the reflecting plate 44. The sensor 45 is provided with a light source
for emitting light and a light receiving element for receiving the light reflected by the reflecting
plate 44. Although not shown, the sensor 45 is fixed to the frame 48.
[0030]
The light source always emits light toward the reflecting plate 44 while the power of the musical
instrument speaker device 1 is turned on, and since the sensor 45 side of the reflecting plate 44
is mirror-finished, the light emitted by the light source Reflect. The light receiving element is
constituted by a phototransistor or the like which generates an electric signal according to the
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amount of light reflected by the reflecting plate 44, and outputs a larger voltage as the distance
between the sensor 45 and the reflecting plate 44 is shorter. Therefore, when an electric signal
such as voice is supplied to the voice coil 41, it vibrates according to the signal, and the sensor
45 outputs an output according to the position of the voice coil 41.
[0031]
In the prior art, it is known that a reflector is fixed to a center cap and the vibration of the
speaker is detected by the light reflected by the reflector, but the center cap may be distorted by
the vibration, or the center cap may By fixing the reflecting plate to the above, there is a problem
that the sound pressure characteristic of the center cap changes, but by fixing the reflecting plate
to the center of the voice coil, these problems can be solved.
[0032]
Next, the details of the preamplifier unit 10 and the feedback unit 20 will be described with
reference to FIG.
FIG. 4 is a block diagram showing a detailed electrical configuration of the preamplifier unit 10
and the feedback unit 20. As shown in FIG. The preamplifier unit 10 mainly includes a head
amplifier 11, an equalizer 12, and a volume (variable resistor) 13. The electric signal input to the
input terminal 51 is amplified to a predetermined level by the head amplifier 11. Then, the
frequency characteristic is changed by the equalizer 12. This frequency characteristic is a
characteristic arbitrarily set by the player by the base adjustment knob 52, the middle
adjustment knob 53, and the treble adjustment knob 54 provided on the operation panel 50. The
level of the electric signal whose frequency characteristic has been changed by the equalizer 12
is adjusted by the volume value set by the volume knob 57.
[0033]
The feedback unit 20 mainly includes a low pass filter 21, a level detector 22, an input / output
function adjustment unit 23, a dynamics sense adjustment volume 29, a head amplifier 24, a
filter 25, an MFB level adjustment volume 28, a voltage A control amplifier (VCA) 26 and a
differential amplifier 27 are provided.
[0034]
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The output of the preamplifier unit 10 is input to the positive input of the differential amplifier
27 and is also input to the low pass filter 21.
The low pass filter 21 is, for example, a low pass filter whose cutoff frequency is set to 100 Hz,
and only low frequency components are input to the level detector 22. The level detector 22
detects the envelope of the amplitude of the input signal by full-wave rectifying the input signal
to obtain an absolute value and applying a low pass filter.
[0035]
The input / output function adjustment unit 23 converts an output value to an input value, and is
adapted to perform conversion according to any one of a plurality of conversion curves as shown
in FIG.
[0036]
FIG. 5 is a graph showing a plurality of conversion curves that the input / output function
adjustment unit 23 has.
In FIG. 5, the conversion curve shown in a is a conversion characteristic that is convex
downward, and if the input value is small, the rate of increase, which is the increment of the
output value with respect to the increment of the input value, is small. , The increase rate is large.
Further, the conversion curve shown in b is an upward convex conversion characteristic, and the
increase rate is large when the input value is small, and the increase rate is small when the input
value is large. In these two conversion curves, the output level increases as the input level
increases. However, in the conversion curves indicated by c and d, the output level decreases as
the input level increases. The conversion curve shown in c is an upward-convex conversion
characteristic, and when the input value is small, the reduction rate, which is the decrease of the
output value relative to the increment of the input value, is small. Is large. The conversion curve
indicated by d is a conversion characteristic that is convex downward, and the reduction rate is
large when the input value is small, and the reduction rate is small when the input value is large.
[0037]
The level adjusted by the input / output function adjustment unit 23 is adjusted by the dynamics
sense adjustment volume 29 and supplied to the control terminal of the voltage control amplifier
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26.
[0038]
On the other hand, the output of the sensor 45 is amplified to a predetermined level by the head
amplifier 24 and input to the filter 25.
The filter 25 is a secondary differential filter, and acquires acceleration from the displacement of
the voice coil 41 detected by the sensor 45. This is because the sound pressure characteristic of
the cone speaker is proportional to the acceleration of the cone. When a voltage proportional to
the acceleration of cone paper is detected using a piezoelectric element or the like, the filter 25 is
unnecessary.
[0039]
The output of the filter 25 is adjusted to an arbitrary level by the player operating the MFB level
adjustment volume 28 and input to the input terminal of the voltage control amplifier 26. The
voltage control amplifier 26 is an amplifier whose amplification factor is controlled to amplify a
signal input to the input terminal by a voltage value supplied to the control terminal. The output
of the voltage control amplifier 26 is input to the negative electrode terminal of the differential
amplifier 27, and the differential amplifier amplifies and outputs the voltage difference between
the positive electrode input and the negative electrode input.
[0040]
Next, with reference to FIG. 6, the characteristic when the feedback amount is adjusted by the
MFB level adjustment volume 28 or the like in the musical instrument speaker device 1
configured as described above will be described. FIG. 6 is a graph showing the characteristic
when the feedback amount is adjusted by the MFB level adjustment volume 28 etc. FIG. 6 (a)
shows the frequency characteristic and FIG. 6 (b) shows the output waveform. It is.
[0041]
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In FIG. 6A, the horizontal axis represents frequency, and the vertical axis represents the sound
pressure level generated by the speaker unit 40. The solid line represents the case where the
feedback amount is zero, and the broken line represents the case where the feedback amount is
small. The dot-and-dash line indicates the frequency characteristics when the feedback amount is
large. When the amount of feedback is small and large, the level of the middle part in the middle
and high range decreases, but in FIG. 6A, the gain of the amplifier is increased to indicate that the
horizontal part becomes the same. Although not shown in the block diagram shown in FIG. 4, for
example, an amplifier for controlling the output level of the preamplifier unit 10 in proportion to
the MFB level 28 may be provided.
[0042]
When the feedback amount is zero, the characteristic is from high frequency to low left
characteristic, when the feedback amount is small, from high frequency to low left characteristic,
and when the feedback amount is large, from low frequency to low left characteristic It is shown
that it becomes. In FIG. 6B, the horizontal axis represents time, and the vertical axis represents
the level of the sound pressure generated by the speaker unit 40. For example, a 50 Hz sine wave
is input to the input, and the solid line represents feedback. When the amount is zero, the broken
line indicates the output waveform when the amount of feedback is large, and the dashed-dotted
line indicates the output waveform when the amount of feedback is large. When the amount of
feedback is zero, the level is lowered at a portion where the sine wave level is relatively low, and
when the amount of feedback is small, the level is depressed at a slightly higher level, and when
the amount of feedback is large, the sign is almost faithfully signed. It has been shown to
regenerate the waves.
[0043]
As described above based on the embodiment, the mechanical speaker of the speaker unit 40 is
detected, the detected value is fed back, and in the speaker device 1 for musical instrument that
drives the speaker unit 40 by the amplifier, the feedback amount is arbitrary. Since the MFB level
adjustment volume 28 to be set is provided, it is possible to form undistorted musical tones and
to form musical tones having optimum timbres for the performer, particularly when reproducing
the low tone range.
[0044]
Further, since the feedback amount can be controlled according to the output level of the
preamplifier unit 10, when the output level is large, the feedback amount can be reduced and
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distortion generated by the power amplifier unit 30 can be reduced.
[0045]
As mentioned above, although the present invention was explained based on an embodiment, the
present invention is not limited at all by the embodiment mentioned above, It is easy that various
improvement change is possible within the range which does not deviate from the meaning of
the present invention It can be guessed that.
[0046]
For example, in the above embodiment, although the preamplifier unit 10 and the feedback unit
20 are configured by analog circuits, A / A that converts an analog electrical signal input to an
input terminal into a digital signal at a predetermined sampling frequency D / A converter, A / D
converter for converting values set by output of sensor 45, volume of equalizer 12, MFB level
adjustment volume 28, dynamics sense adjustment volume 29, etc. into digital signals, and these
A / D A digital signal converted by the converter is input, and a DSP (digital signal processing
device) that performs processing in the preamplifier unit 10 and the feedback unit, and D / A
that converts the digital signal processed and output by the DSP into an analog signal And a
converter, and perform the same processing as the above embodiment. It may be.
[0047]
In the above embodiment, the feedback unit 20 includes the low pass filter 21, the level detector
22, the input / output function adjustment unit 23, and the dynamics sense adjustment volume
29, and detects the output of the preamplifier unit 10, Although the output level of the sensor 45
is controlled by the detected value, the head amplifier 24, the filter 25, the MFB level adjustment
volume 28, and the differential amplifier 27 are simply included. The output of the preamplifier
unit 10 may be input to the positive electrode terminal, and the output of the sensor 45 adjusted
by the MFB level adjustment volume 28 may be input to the negative electrode terminal.
[0048]
In the above embodiment, the input / output function adjustment unit 23 converts the detection
level of the output of the preamplifier unit 10, but the value detected by the sensor 45 is
converted by the input / output function adjustment unit 23 The converted value may be
supplied to the differential amplifier 27.
[0049]
In the above embodiment, the output of the preamplifier unit 10 is detected, and the output of
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the sensor 45 is adjusted according to the detected level. However, the value set by the volume
13 is detected, and The output of the sensor 45 may be adjusted accordingly.
[0050]
In the above embodiment, the output of the preamplifier unit 10 is detected, and the output of
the sensor 45 is adjusted according to the detected level. However, the volume of either the base,
middle, or treble of the equalizer 12 is used. The output of the sensor 45 may be adjusted
according to the set value or the value set by the combination of the settings of the plurality of
volumes.
[0051]
It is a block diagram which shows the electric constitution of the speaker apparatus for musical
instruments by this invention.
It is a panel figure showing an operation panel.
It is a sectional view showing a section of a speaker part.
It is a block diagram which shows the detailed electric constitution of a preamplifier part and a
feedback part.
It is a graph which shows an input / output function.
It is a figure which shows the characteristic of the musical tone which changes with feedback
amount, Comprising: (a) is a frequency characteristic, (b) is a graph which shows the output
waveform at the time of inputting a sine wave.
Explanation of sign
[0052]
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DESCRIPTION OF SYMBOLS 1 Speaker device for musical instrument 10 Preamplifier part 12
Equalizer 20 Feedback part 26 Voltage control amplifier (feedback amount setting means) 28
MFB level adjustment volume (feedback amount setting means) 29 Dynamics sense adjustment
volume (sense adjustment means) 30 Power amplifier part (amplifier ) 40 Speaker unit 44
Reflecting plate 45 Optical sensor (light source and light receiving element)
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