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JP2002345076

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DESCRIPTION JP2002345076
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproducing apparatus for use in various audio equipment and television receivers, and in
particular, it is reproduced from the speaker inside various audio loads coupled to a speaker unit.
The present invention relates to a sound reproducing apparatus having a microphone for
detecting a sound signal, correcting the reproduction sound of the speaker unit by the sound
detection signal of the microphone and suppressing unnecessary vibration from the speaker.
[0002]
An acoustic tube or horn is coupled to the front of a speaker unit, and a sound wave generated
from the speaker unit is guided to the opening of the acoustic tube, and a microphone is disposed
inside the acoustic tube to output the output of the microphone Japanese Patent Application
Laid-Open No. 7-162990 discloses that an acoustic reproducing apparatus having a negative
feedback circuit by connecting a signal to a subtractor provided in front of a power amplifier for
driving a speaker is effective for improving acoustic characteristics. It is known by
[0003]
These techniques are described with reference to FIG.
FIG. 30 is a block diagram of a conventional acoustic feedback speaker device. According to the
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1
figure, reference numeral 1 denotes a speaker unit for generating a sound wave, and the speaker
unit 1 is coupled to an acoustic tube 2. Inside the acoustic tube 2, a microphone 3 for detecting
an acoustic output signal is provided, and the output of the microphone 3 is connected to a
microphone amplifier 7 for amplifying the output signal of the microphone 3. The output signal
of the microphone amplifier 7 is added (or subtracted) to the input signal of the power amplifier
6 for driving the speaker 1 by the adder / subtractor 8, and the output of the adder / subtractor
8 is provided in the front stage of the power amplifier 6. It is connected to the subtractor 5 to
form a negative feedback circuit.
[0004]
With this configuration, the peak dip of resonance generated by the acoustic tube 2 can be
corrected, and the low-frequency reproduction frequency band of the speaker unit 1 can be
expanded, and a good acoustic reproduction device of reproduction sound can be stably realized.
Met.
[0005]
However, even if such a sound reproducing device is used in a television receiver, the vibration of
the speaker unit may cause the vibration of the television receiver as the volume of the television
receiver is increased. It is transmitted to the cathode ray tube or the case, causing a problem that
the image is distorted or an abnormal sound is generated.
[0006]
The present invention solves these problems and provides an excellent sound reproduction
apparatus that performs good reproduction sound and vibration suppression control.
[0007]
According to a first aspect of the present invention, there is provided an amplifier for adjusting
the volume and sound quality of a reproduction signal, a power amplifier for connecting the
output of the amplifier, and an output signal of the power amplifier. , A speaker tube coupled to
the front of the speaker unit for guiding sound waves, a microphone disposed on the front of the
speaker unit for detecting the sound output radiated from the speaker unit, the microphone And
a filter for correcting the amplitude and phase of the output signal of the microphone amplifier,
and the output signal of the filter for correcting the amplitude and phase is provided at the front
stage of the power amplifier. Connected to the first subtractor to form a first negative feedback
circuit, and A sound reproducing apparatus comprising a second negative feedback circuit by
connecting the output signal of a low-pass filter for processing the output signal of the amplifier
to the second subtractor provided in the previous stage of the amplifier adjusting the volume and
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2
sound quality. With the improvement of the frequency characteristic and the increase of the
sound volume, the feedback amount near the lowest resonance frequency of the speaker is
increased, and the sound reproduction and the vibration are suppressed to reduce the influence
of the vibration.
[0008]
The invention according to claim 2 of the present invention, in the invention according to claim
1, has a configuration in which a closed type box is coupled to the rear surface of the abovementioned speaker unit, and has an action of improving the low frequency reproduction
capability.
[0009]
The invention according to claim 3 of the present invention, in the invention according to claim
1, has a configuration in which a bass reflex type box is coupled to the rear surface of the abovementioned speaker unit, and has an effect of improving the low frequency reproduction
capability.
[0010]
According to a fourth aspect of the present invention, in the first aspect, the passive radiator type
box is coupled to the rear surface of the speaker unit, and has an effect of improving the lowfrequency reproduction capability.
[0011]
According to a fifth aspect of the present invention, there is provided an amplifier for adjusting
the volume and sound quality of a reproduction signal, a power amplifier for connecting the
output of the amplifier, a speaker unit for reproducing the output signal of the power amplifier,
and the speaker A microphone provided inside a sealed box in which the unit is disposed, for
detecting an acoustic output radiated from the speaker unit, a microphone amplifier for
amplifying an acoustic output signal detected by the microphone, and an output signal of the
microphone amplifier A first high pass filter to be processed, and an output of the first high pass
filter is connected to a first subtractor provided in front of the power amplifier to constitute a
first negative feedback circuit And adjust the output of the second high-pass filter connected to
the output signal of the microphone amplifier to the above-mentioned volume and sound quality.
The second negative feedback circuit is connected to the second subtractor provided in the
previous stage of the amplifier to improve the low frequency reproduction capability of the
closed speaker box and to increase the volume of the speaker. The amount of feedback near the
lowest resonance frequency is increased, and good acoustic reproduction and vibration are
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suppressed to reduce the influence of vibration.
[0012]
According to a sixth aspect of the present invention, there is provided an amplifier for adjusting
the volume and sound quality of a reproduction signal, a power amplifier for connecting the
output of the amplifier, a speaker unit for reproducing an output signal of the power amplifier,
and the speaker A microphone provided inside a sealed box in which the unit is disposed, for
detecting an acoustic output radiated from the speaker unit, a microphone amplifier for
amplifying an acoustic output signal detected by the microphone, and an output signal of the
microphone amplifier A negative feedback circuit is configured by connecting a high pass filter to
be processed and the output of the high pass filter to a subtractor provided in front of the
amplifier adjusting the volume and sound quality to constitute a negative feedback circuit. In
addition, the amount of feedback near the lowest resonance frequency of the speaker is
increased to suppress the vibration and reduce the influence of the vibration. It has the effect of
say.
[0013]
The invention described in claim 7 of the present invention is the output of a microphone
according to the invention described in claim 5, wherein the speaker unit is disposed in a bass
reflex type box, and an acoustic output provided inside the bass reflex type box is detected. The
signal is connected to a low pass filter and a high pass filter, the output signals of the low pass
filter and the high pass filter are added by an adder, and the output signal of the adder is a
feedback signal. As well as improving the low-frequency reproduction capability of the bass
reflex type speaker box, it has the effect of increasing the feedback amount near the lowest
resonance frequency of the speaker as the volume increases and suppressing the vibration to
reduce the influence of the vibration.
[0014]
According to an eighth aspect of the present invention, in the sixth aspect, the speaker unit is
disposed in a bass reflex type box, and an output of a microphone for detecting an acoustic
output provided inside the bass reflex type box. The signal is connected to a low pass filter and a
high pass filter, the output signals of the low pass filter and the high pass filter are added by an
adder, and the output signal of the adder is a feedback signal. The amount of feedback near the
lowest resonance frequency of the speaker is increased with the increase of the volume to
suppress the vibration and reduce the influence of the vibration.
[0015]
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4
The invention described in claim 9 of the present invention is the output of a microphone
according to the invention described in claim 5, wherein the speaker unit is disposed in a bass
reflex type box and the acoustic output provided inside the bass reflex type box is detected. The
signal is connected to a band rejection filter, and the output signal of the above band rejection
filter is used as a feedback signal to improve the low frequency reproduction capability of the
bass reflex type speaker box and to increase the volume and around the lowest resonance
frequency of the speaker. The feedback amount is increased to suppress the vibration to reduce
the influence of the vibration.
[0016]
According to a tenth aspect of the present invention, in the sixth aspect, the speaker unit is
disposed in a bass reflex type box, and an output of a microphone for detecting an acoustic
output provided inside the bass reflex type box. The signal is connected to a band rejection filter,
and the output signal of the band rejection filter is used as a feedback signal, and the feedback
amount near the lowest resonance frequency of the speaker is increased with the increase of the
sound volume to suppress the vibration and affect the vibration. Have the effect of reducing
[0017]
According to an eleventh aspect of the present invention, in the fifth aspect, the speaker unit is
disposed in a passive radiator type box, and a microphone for detecting an acoustic output
provided inside the passive radiator type box. Output signals of the low pass filter and high pass
filter are connected, the output signals of the low pass filter and high pass filter are added by an
adder, and the output signal of the adder is used as a feedback signal And improve the low
frequency reproduction capability of the passive radiator type speaker box, and increase the
feedback amount near the lowest resonance frequency of the speaker with the increase of the
volume to suppress the vibration and reduce the influence of the vibration. .
[0018]
According to a twelfth aspect of the present invention, in the sixth aspect, the speaker unit is
disposed in a passive radiator type box, and a microphone for detecting an acoustic output
provided inside the passive radiator type box. Output signals of the low pass filter and high pass
filter are connected, the output signals of the low pass filter and high pass filter are added by an
adder, and the output signal of the adder is used as a feedback signal Thus, the feedback amount
near the lowest resonance frequency of the speaker is increased with the increase of the volume,
and the vibration is suppressed to reduce the influence of the vibration.
[0019]
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5
According to a thirteenth aspect of the present invention, in the fifth aspect, the speaker unit is
disposed in a passive radiator type box, and a microphone for detecting an acoustic output
provided inside the passive radiator type box. The output signal of the band rejection filter is
connected to the band rejection filter, and the output signal of the band rejection filter is used as
a feedback signal to improve the low frequency reproduction capability of the passive radiator
type speaker box and to increase the volume of the speaker. The feedback amount near the
frequency is increased to suppress the vibration to reduce the influence of the vibration.
[0020]
The invention according to a fourteenth aspect of the present invention is the microphone
according to the sixth aspect, wherein the speaker unit is disposed in a passive radiator type box,
and a microphone provided inside the passive radiator type box detects an acoustic output. The
output signal from the band rejection filter is connected to the band rejection filter, and the
output signal from the band rejection filter is used as a feedback signal. Have the effect of
reducing the influence of
[0021]
According to a fifteenth aspect of the present invention, in the fifth aspect, the speaker unit is
disposed in a Kelton-type box, and the passive radiator of the Kelton-type box and the space
inside the front surface of the speaker unit The output signal of the microphone provided to
detect the acoustic output is connected to a low pass filter and a high pass filter, and the output
signals of the low pass filter and the high pass filter are added by an adder, and the adder Is used
as a feedback signal to improve the low-frequency reproduction capability of the Kelton-type
speaker box, and increase the feedback amount near the lowest resonance frequency of the
speaker with the increase of the volume to suppress the vibration and suppress the vibration. It
has the effect of reducing the influence.
[0022]
The invention described in claim 16 of the present invention is characterized in that, in the
invention described in claim 6, the speaker unit is disposed in a Kelton type box, the passive
radiator of the Kelton type box, and the space inside the front surface of the speaker unit. The
output signal of the microphone provided to detect the acoustic output is connected to a low pass
filter and a high pass filter, and the output signals of the low pass filter and the high pass filter
are added by an adder, and the adder The output signal of is used as a feedback signal, and has
an effect of increasing the amount of feedback near the lowest resonance frequency of the
speaker as the volume increases and suppressing the vibration to reduce the influence of the
vibration.
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[0023]
According to a seventeenth aspect of the present invention, in the fifth aspect, the speaker unit is
disposed in a Kelton-type box, the passive radiator of the Kelton-type box, and the space inside
the front surface of the speaker unit. An output signal of a microphone for detecting an acoustic
output provided is connected to a band rejection filter, and an output signal of the band rejection
filter is used as a feedback signal, thereby improving the low frequency reproduction capability
of the Kelton speaker box. The amount of feedback in the vicinity of the lowest resonance
frequency of the speaker is increased with the increase of the volume to suppress the vibration to
reduce the influence of the vibration.
[0024]
According to an eighteenth aspect of the present invention, in the sixth aspect, the speaker unit is
disposed in a Kelton-type box, and the passive radiator of the Kelton-type box and the space
inside the front surface of the speaker unit The output signal of the microphone for detecting the
provided acoustic output is connected to the band rejection filter, and the output signal of the
band rejection filter is used as the feedback signal, and the feedback amount near the lowest
resonance frequency of the speaker is increased with the increase of the volume. It has the effect
of increasing and suppressing the vibration to reduce the influence of the vibration.
[0025]
The invention according to a nineteenth aspect of the present invention is the microphone
according to the fifth aspect, wherein the speaker unit is disposed in a Kelton-type box, and a
microphone provided within the space on the rear surface of the speaker unit detects an acoustic
output. The output signal of the high-pass filter is connected to the high-pass filter, and the
output signal of the high-pass filter is used as a feedback signal to improve the low-pass
reproduction capability of the Kelton speaker box and The amount of feedback near the
resonance frequency is increased to suppress the vibration to reduce the influence of the
vibration.
[0026]
The invention according to a twentieth aspect of the present invention is the microphone
according to the fifth aspect, wherein the speaker unit is disposed in a Kelton-type box, and a
microphone provided in the space on the rear surface of the speaker unit detects an acoustic
output. The output signal of the high-pass filter is connected to the high-pass filter, and the
output signal of the high-pass filter is used as a feedback signal. To reduce the influence of
vibration.
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7
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to FIGS. 1 to 29. FIG.
[0028]
(First Embodiment) FIG. 1 is a block diagram of a sound reproducing apparatus according to a
first embodiment of the present invention.
In FIG. 1, a signal to be regenerated is input to an input terminal 9, and this terminal 9 is
connected to a second subtractor 10.
In the negative feedback loop configured by the second subtractor 10, the feedback amount
changes according to the volume level.
The output of the second subtractor 10 is connected to the first subtractor 12, and the amount of
feedback in the negative feedback loop formed by the first subtractor 12 is set to be constant.
The output signal of the first subtractor 12 is connected to a power amplifier 13 that drives the
speaker unit 14, and the output signal of the power amplifier 13 is connected to the speaker unit
14.
[0029]
The speaker unit 14 is connected to an acoustic tube 15, and inside the acoustic tube 15, a
microphone 16 for collecting an acoustic output signal of the speaker unit 14 is installed.
The output signal of the microphone 16 is proportional to the output sound pressure
(acceleration) of the speaker unit 14, and the frequency characteristic of the output signal is as
shown in FIG.
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8
[0030]
The output signal of the microphone 16 is amplified by the microphone amplifier 17, connected
to an amplitude and phase correction filter 18 for stabilizing negative feedback, and subjected to
signal processing.
The amplitude and phase correction filter 18 is set such that stable negative feedback is applied
from the lowest resonance frequency of the speaker unit 14 to the primary resonance frequency
of the acoustic tube 15.
The output signal of the amplitude and phase correction filter 18 is connected to the first
subtractor 12 to form a first negative feedback loop with a fixed feedback amount.
By this negative feedback, the low-frequency reproduction frequency band of the speaker unit 14
is expanded (the lowest resonance frequency is apparently lowered), and the peak (around 300
Hz) at the primary resonance frequency of the acoustic tube 15 is corrected. Is obtained.
[0031]
The output signal of the microphone amplifier 17 is then connected to a low pass filter 19 to
form a second negative feedback loop.
The transfer frequency characteristic of the low pass filter 19 is shown in FIG.
The cut-off frequency of the low pass filter 19 is set to the same frequency as the lowest
resonance frequency when the speaker unit 14 and the acoustic tube 15 are coupled.
The output frequency characteristic of the low pass filter 19 is, as shown in FIG. 4, a frequency
characteristic which is obtained by extracting the lowest resonance frequency when the speaker
unit 14 and the acoustic tube 15 are coupled.
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The frequency characteristic shown in FIG. 4 has a smooth frequency characteristic because the
peak of the resonance frequency (about 300 Hz) of the acoustic tube 15 has already been
corrected in the first negative feedback loop, and the second negative feedback loop is stabilized.
It is effective for
[0032]
The output signal of the low-pass filter 19 is connected to the second subtractor 10 provided at
the previous stage of the sound volume adjustment amplifier 11 to form a second negative
feedback loop.
The frequency characteristics of the second negative feedback loop are shown in FIG.
FIG. 5 shows the output frequency characteristics of the power amplifier 13 when the sound
volume and the sound volume of the sound quality adjustment amplifier 11 are changed in an
overlapping manner.
That is, since the gain after the second subtractor 10 is increased when the volume is increased
(or the low band adjustment level is maximum), the feedback amount of the signal extracted by
the low pass filter 19 is increased. The gain of the lowest resonance frequency due to the
coupling of the speaker unit 14 and the acoustic tube 15 is reduced.
As shown in FIG. 5, the level near 90 Hz decreases with the increase in the volume and gain of
the tone control amplifier 11, so when the volume (or low range enhancement) is increased, the
speaker unit 14 and the sound tube 15 It is possible to reduce the vibration transmitted to the
cathode ray tube and the case of the John receiver, and to reduce the fluctuation of the image
and the abnormal sound of the case.
[0033]
Moreover, unlike the method of simply reducing the level of the bass region electrically by using
this configuration, a signal obtained by filtering the output sound pressure (acceleration)
characteristic of the speaker is used, so that the speaker has a large amplitude. The level is
reduced while the distortion is reduced, and the reproduced sound is a clear bass and a good
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10
bass with little distortion at the time of large volume, unlike the one where the bass is simply
reduced.
[0034]
(Embodiment 2) FIG. 6 shows a block diagram of Embodiment 2 of the sound reproducing
apparatus of the present invention.
In the configuration of the first embodiment, the closed box 20 is provided on the back surface of
the speaker unit 14 so that the low frequency reproduction capability is further improved, and
the vibration suppression effect can be obtained as in the first embodiment.
[0035]
(Third Embodiment) FIG. 7 shows a block diagram of the third embodiment of the sound
reproducing apparatus according to the present invention.
The bass reflex type box 21 is provided on the back of the speaker unit 14 in the configuration of
the first embodiment, so that the low-frequency reproduction capability is further improved, and
the vibration suppression effect can be obtained as in the first embodiment.
[0036]
(Fourth Embodiment) FIG. 8 is a block diagram of a sound reproducing apparatus according to a
fourth embodiment of the present invention.
In the configuration of the first embodiment, the passive radiator type box 22 is provided on the
back surface of the speaker unit 14 so that the low frequency reproduction capability is further
improved, and the vibration suppressing effect can be obtained as in the first embodiment. .
[0037]
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11
(Fifth Embodiment) FIG. 9 is a block diagram showing a fifth embodiment of the sound
reproducing apparatus according to the present invention.
The output signal of the microphone 16 provided inside the closed box 20 is connected to the
microphone amplifier 17 and amplified.
The output voltage and frequency characteristics of the microphone amplifier 17 are as shown in
FIG.
The output signal of the microphone amplifier 17 is connected to a first high pass filter 23.
The output voltage and frequency characteristic of the first high-pass filter 23 are set to the same
cutoff frequency as the lowest resonance frequency of the speaker unit 14 as shown in FIG.
The output voltage and frequency characteristic of the first high pass filter 23 are as shown in
FIG. 12, and the voltage characteristic in the vicinity of the lowest resonance frequency of the
speaker unit 14 is obtained.
[0038]
The output signal of the first high pass filter 23 is connected to the first subtractor 12 to form a
negative feedback loop for correcting the low frequency characteristic of the speaker unit 14.
Further, the output signal of the microphone amplifier 17 is connected to a second high pass
filter 24 having the same frequency characteristic as the first high pass filter 23, and the output
voltage of the second high pass filter 24 is a second Is negatively fed back to the subtracter 10 of
[0039]
In the negative feedback loop formed by the second subtractor 10, the feedback amount
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12
increases as the gain of the sound volume adjustment amplifier 11 increases, and the low
frequency characteristic of the speaker unit 14 is corrected, and along with the volume increase,
The negative feedback amount at the lowest resonance frequency of the speaker unit 14 is
increased, and unnecessary vibration to the cathode ray tube is suppressed even at high volume,
and the abnormal amplitude of the speaker unit 14 is also suppressed, so that good bass
reproduction can be obtained. Is obtained.
[0040]
(Sixth Embodiment) FIG. 13 is a block diagram showing the sixth embodiment of the sound
reproducing apparatus according to the present invention.
The output voltage of the high pass filter 25 extracts the voltage of the lowest resonance
frequency of the speaker unit 14 and is connected to the subtractor 10 to form a negative
feedback loop, and the amount of negative feedback increases as the volume increases. Even at
the time of volume control, the abnormal amplitude of the speaker unit 14 can be suppressed,
and the unnecessary vibration to the cathode ray tube can be suppressed.
[0041]
Seventh Embodiment FIG. 14 is a cross-sectional view of a speaker box according to a seventh
embodiment of the sound reproduction device of the present invention. The speaker unit 14 is
housed in a bass reflex type box 27 and is provided with a bass reflex port 26 in order to expand
the low frequency reproduction frequency. The sound pressure and frequency characteristics of
the bass reflex type box 27 are as shown in FIG. In the case of the bass reflex system, the
resonance of the bass reflex port 26 and the lowest resonance of the speaker unit 14 have two
resonances, as shown in FIG. 15, the sound pressure and frequency characteristics in the vicinity
of the bass reflex box 27 are between the two resonances. I can do a dip. The voltage and
frequency characteristics of the output signal of the microphone 16 provided inside the bass
reflex type box 27 become as shown in FIG. 17, and in fact, it is a characteristic different from
the sound pressure and frequency characteristic (FIG. 15) outside the bass reflex type box 27 It
becomes. FIG. 16 shows a block diagram of the sound reproduction device in the seventh
embodiment. The output signal of the microphone 16 is amplified by the microphone amplifier
17 and connected to the high pass filters 28 and 31 and the low pass filters 29 and 32, and the
respective output signals are added by the adders 30 and 33. The output voltage and frequency
characteristics of the adders 30 and 33 are as shown in FIG. 18 and are substantially the same as
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13
the characteristics obtained by removing the high frequency components of the sound pressure
and frequency characteristics outside the bass reflex type box 27.
[0042]
By using the output signals of the adders 30 and 33 as feedback signals, the same effect as in the
fifth embodiment can be obtained in the bass reflex type box 27 as well.
[0043]
Eighth Embodiment FIG. 19 shows a block diagram of an eighth embodiment of the sound
reproducing apparatus according to the present invention.
With this configuration, the same effect as that of the sixth embodiment can be obtained. That is,
the output of the microphone amplifier 17 is connected to the high pass filter 34 and the low
pass filter 35, and the output is added by the adder 36 and connected to the subtractor 10 to
form a negative feedback circuit.
[0044]
(Embodiment 9) FIG. 20 is a block diagram of a sound reproduction apparatus according to a
ninth embodiment of the present invention. In order to equalize the sound pressure and
frequency characteristics (FIG. 15) outside the bass reflex box 27 and the frequency
characteristics of the output signal of the microphone 16 provided inside the bass reflex box 27,
Band stop filters 37 and 38 are provided. The output voltages and frequency characteristics of
the band rejection filters 37 and 38 are as shown in FIG. 21, and the output signals of the band
rejection filters 37 and 38 are substantially the same as the sound pressure and frequency
characteristics outside the bass reflex type box 27. The same effects as those of the fifth
embodiment can be obtained by feeding back this signal.
[0045]
Tenth Embodiment FIG. 22 is a block diagram showing the tenth embodiment of the sound
reproducing apparatus according to the present invention. In order to equalize the sound
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14
pressure and frequency characteristics (FIG. 15) outside the bass reflex box 27 and the frequency
characteristics of the output signal of the microphone 16 provided inside the bass reflex box 27,
A band rejection filter 39 is provided. The output voltage and frequency characteristic of the
band rejection filter 39 are as shown in FIG. 21, and the output signal of the band rejection filter
39 has substantially the same characteristics as the sound pressure and frequency characteristics
outside the bass reflex type box 27, By feeding back the signal, the same effect as that of the
sixth embodiment can be obtained.
[0046]
Eleventh Embodiment FIG. 23 shows a cross-sectional view of a passive radiator system in the
eleventh embodiment of the sound reproduction device of the present invention. The speaker
unit 14 and the passive radiator 40 are disposed in the passive radiator type box 41, and the
microphone 16 is provided inside the passive radiator type box 41. If a control configuration
similar to that of FIG. 16 is used for the passive radiator type box 41, the same effect as that of
the seventh embodiment can be obtained.
[0047]
(Twelfth Embodiment) FIG. 23 shows a sectional view of a passive radiator system according to a
twelfth embodiment of the sound reproducing apparatus of the present invention. The speaker
unit 14 and the passive radiator 40 are disposed in the passive radiator type box 41, and the
microphone 16 is provided inside the passive radiator type box 41. If a control configuration
similar to that of FIG. 19 is used for the passive radiator type box 41, the same effect as the
eighth embodiment can be obtained.
[0048]
(Thirteenth Embodiment) FIG. 23 shows a cross-sectional view of a passive radiator system in the
thirteenth embodiment of the sound reproduction device of the present invention. The speaker
unit 14 and the passive radiator 40 are disposed in the passive radiator type box 41, and the
microphone 16 is provided inside the passive radiator type box 41. If a control configuration
similar to that of FIG. 20 is used for the passive radiator type box 41, the same effect as that of
the ninth embodiment can be obtained.
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15
[0049]
Fourteenth Embodiment FIG. 23 shows a cross-sectional view of a passive radiator system
according to a fourteenth embodiment of the sound reproduction device of the present invention.
The speaker unit 14 and the passive radiator 40 are disposed in the passive radiator type box 41,
and the microphone 16 is provided inside the passive radiator type box 41. If a control
configuration similar to that of FIG. 22 is used for the passive radiator type box 41, the same
effect as the tenth embodiment can be obtained.
[0050]
(Fifteenth Embodiment) FIG. 24 shows a cross-sectional view of the Kelton scheme in the
fifteenth embodiment of the sound reproduction device of the present invention. The Kelton type
box 43 has a sealed room on the front and back of the speaker unit 14. A passive radiator 42 is
further disposed on the front of the speaker unit 14, and the sound pressure and frequency
characteristics of the Kelton box 43 are as shown in FIG. The microphone 16 is disposed between
the speaker unit 14 of the Kelton box 43 and the passive radiator 42, and the output voltage and
frequency characteristics of the microphone 16 are substantially the same as those shown in FIG.
If a control configuration similar to that of FIG. 16 is used for the Kelton-type box 43, the same
effect as that of the seventh embodiment can be obtained.
[0051]
Sixteenth Embodiment FIG. 24 is a cross-sectional view of a Kelton system according to a
sixteenth embodiment of the sound reproduction device of the present invention. The Kelton type
box 43 has a sealed room on the front and back of the speaker unit 14. A passive radiator 42 is
further disposed on the front of the speaker unit 14, and the sound pressure and frequency
characteristics of the Kelton box 43 are as shown in FIG. The microphone 16 is disposed between
the speaker unit 14 of the Kelton box 43 and the passive radiator 42, and the output voltage and
frequency characteristics of the microphone 16 are substantially the same as those shown in FIG.
If a control configuration similar to that of FIG. 19 is used for the Kelton-type box 43, the same
effect as that of the eighth embodiment can be obtained.
[0052]
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16
Seventeenth Embodiment FIG. 24 shows a cross section of the Kelton scheme in the seventeenth
embodiment of the sound reproduction device of the present invention. The Kelton type box 43
has a sealed room on the front and back of the speaker unit 14. A passive radiator 42 is further
disposed on the front of the speaker unit 14, and the sound pressure and frequency
characteristics of the Kelton box 43 are as shown in FIG. The microphone 16 is disposed between
the speaker unit 14 of the Kelton box 43 and the passive radiator 42, and the output voltage and
frequency characteristics of the microphone 16 are substantially the same as those shown in FIG.
If a control configuration similar to that of FIG. 20 is used for the Kelton-type box 43, the same
effect as that of the ninth embodiment can be obtained.
[0053]
Eighteenth Embodiment FIG. 24 is a cross-sectional view of the Kelton system in the eighteenth
embodiment of the sound reproduction device of the present invention. The Kelton type box 43
has a sealed room on the front and back of the speaker unit 14. A passive radiator 42 is further
disposed on the front of the speaker unit 14, and the sound pressure and frequency
characteristics of the Kelton box 43 are as shown in FIG. The microphone 16 is disposed between
the speaker unit 14 of the Kelton box 43 and the passive radiator 42, and the output voltage and
frequency characteristics of the microphone 16 are substantially the same as those shown in FIG.
If a control configuration similar to that of FIG. 22 is used for the Kelton-type box 43, the same
effect as in the tenth embodiment can be obtained.
[0054]
Nineteenth Embodiment FIG. 26 shows a cross-sectional view of the Kelton system in the
nineteenth embodiment of the sound reproduction device of the present invention. The Kelton
type box 43 has a sealed room on the front and back of the speaker unit 14. A passive radiator
42 is further disposed on the front of the speaker unit 14. The microphone 16 is disposed in the
closed space on the back of the speaker unit 14 of the Kelton-type box 43, and the output voltage
and frequency characteristics of the microphone 16 are as shown in FIG. The control
configuration of this embodiment is the same as that of the fifth embodiment. The output signal
of the microphone 16 is amplified by the microphone amplifier 17, passes through high-pass
filters 23 and 24 having voltage and frequency characteristics as shown in FIG. 28, and has
output voltage and frequency characteristics as shown in FIG. It is converted to a feedback signal.
If a control configuration similar to that of FIG. 9 is used for the Kelton-type box 43, the same
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effect as that of the fifth embodiment can be obtained.
[0055]
Twenty-Fourth Embodiment FIG. 26 is a cross-sectional view of a Kelton system in a twentysecond embodiment of a sound reproduction device according to the present invention. The
Kelton type box 43 has a sealed room on the front and back of the speaker unit 14. A passive
radiator 42 is further disposed on the front of the speaker unit 14. The microphone 16 is
disposed in the closed space on the back of the speaker unit 14 of the Kelton-type box 43, and
the output voltage and frequency characteristics of the microphone 16 are as shown in FIG. The
control configuration of the present embodiment is the same as that of the sixth embodiment.
The output signal of the microphone 16 is amplified by the microphone amplifier 17 and passes
through a high pass filter 25 having voltage and frequency characteristics as shown in FIG. 28
and a feedback signal having output voltage and frequency characteristics as shown in FIG.
Converted to If a control configuration similar to that of FIG. 13 is used for the Kelton-type box
43, the same effect as that of the sixth embodiment can be obtained.
[0056]
As described above, according to the present invention, only the band around the lowest
resonance frequency of the speaker unit (system) is extracted from the sound pressure and
frequency characteristics of the speaker system detected by the microphone, and By correcting
with one fixed negative feedback loop and further feeding back to the previous stage of the
volume sound quality adjustment amplifier, not only the low range characteristic of the speaker
unit (system) is improved, but also from the speaker unit at high volume It is possible to realize
an excellent sound reproducing apparatus capable of suppressing abnormal noise and
suppressing unnecessary vibration from a speaker unit to a CRT or the like.
[0057]
Brief description of the drawings
[0058]
1 is a block diagram of the first embodiment of the sound reproduction apparatus of the present
invention
[0059]
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18
Fig. 2 Same microphone output signal frequency characteristics
[0060]
Fig. 3 Frequency characteristics of the same low pass filter
[0061]
Figure 4 Output frequency characteristics of the same low pass filter
[0062]
Fig. 5 shows the change in frequency characteristics as the volume increases.
[0063]
6 is a block diagram of the second embodiment of the sound reproduction device of the present
invention
[0064]
7 is a block diagram of the third embodiment of the sound reproduction apparatus of the present
invention
[0065]
8 is a block diagram of the fourth embodiment of the sound reproduction device of the present
invention
[0066]
9 is a block diagram of the fifth embodiment of the sound reproduction device of the present
invention
[0067]
Fig. 10 Output frequency characteristics of the same microphone
[0068]
Fig. 11 Frequency characteristics of the same high pass filter
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19
[0069]
Fig. 12 The frequency characteristic diagram of the output of the same high pass filter
[0070]
13 is a block diagram of the sixth embodiment of the sound reproduction device according to the
present invention
[0071]
14 is a cross-sectional view of the bass reflex box according to the seventh embodiment of the
sound reproduction device of the present invention.
[0072]
Figure 15 Sound pressure and frequency characteristics of the bass reflex box
[0073]
16 is a block diagram of a seventh embodiment of the sound reproduction device according to
the present invention.
[0074]
Fig. 17 Output frequency characteristics of the same microphone
[0075]
Fig. 18 Output frequency characteristics of the same adder
[0076]
19 is a block diagram of the eighth embodiment of the sound reproduction device of the present
invention
[0077]
Fig. 20 A block diagram of a ninth embodiment of the sound reproduction device according to
the present invention
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20
[0078]
Figure 21: Frequency characteristics of the same band rejection filter
[0079]
22 is a block diagram of a tenth embodiment of the sound reproduction device according to the
present invention
[0080]
23 is a cross-sectional view of the passive radiator box of the eleventh to fourteenth
embodiments of the sound reproduction device according to the present invention.
[0081]
24 is a cross-sectional view of the Kelton box of the fifteenth to eighteenth embodiments of the
sound reproduction device according to the present invention.
[0082]
Figure 25 Sound pressure and frequency characteristics of the same Kelton box
[0083]
26 is a cross-sectional view of the Kelton box of the nineteenth and twentieth embodiments of
the sound reproducing apparatus according to the present invention.
[0084]
Fig. 27 Output frequency characteristics of the same microphone
[0085]
Fig. 28 Frequency characteristics of the same high pass filter
[0086]
Fig. 29 Output frequency characteristics of the same high pass filter
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21
[0087]
Fig. 30 Block diagram of the conventional sound reproducing apparatus
[0088]
Explanation of sign
[0089]
9 input terminal 10 second subtractor 11 volume and tone control amplifier 12 first subtractor
13 power amplifier 14 speaker unit 15 acoustic tube 16 microphone 17 microphone amplifier
18 amplitude and phase correction filter 19 low pass filter 20 closed speaker Box 21 bass reflex
type loudspeaker box 22 passive radiator loudspeaker type box 23 first high pass filter 24
second high pass filter 25 high pass filter 26 bass reflex port 27 bass reflex type box 28, 31, 34
high pass filter 29 , 32, 35 Low-pass filters 30, 33, 36 Adders 37, 38, 39 Bandstop filters 40, 42
Passive radiators 41 Passive radiator box 43 Kelton box
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