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JPH0984173

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH0984173
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproduction apparatus which divides an audio signal into bands and reproduces signals
using different speakers in each band.
[0002]
2. Description of the Related Art As a conventional sound reproducing apparatus for reproducing
using different speakers and amplifiers for each band, there is a two-way type as shown in FIG. In
the figure, 1 is an acoustic input terminal, 2 is a high pass filter for extracting a high frequency
side signal of the acoustic signal, 3 is a phase equalizer for linearizing the phase characteristic of
the front speaker 5, 4 is a phase equalizer 3 Is an amplifier for amplifying an acoustic signal from
the front speaker 5 and supplying the amplified signal to the front speaker 5. The front speaker
5 radiates an acoustic signal of middle to high frequency into space. Further, 6 is a low pass filter
for extracting a low band side signal of the acoustic signal, 7 is a first delay circuit for adjusting
the reproduction timing of the woofer 9, and 8 is a signal from the first delay circuit 7. An
amplifier that amplifies the acoustic signal and supplies it to the woofer 9 is a woofer that
radiates the low-range acoustic signal into space.
[0003]
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1
FIG. 14 shows the group delay characteristics of each of the speakers and the overall group delay
characteristics. In the figure, 10 is an overall group delay characteristic, 11 is a group delay
characteristic of the front speaker 5 including the phase equalizer 3, and 12 is a group delay
characteristic of the woofer 9 including the first delay circuit 7.
[0004]
This is to make the integrated group delay characteristics of the high pass filter 2 and the front
speaker 5 and the delay characteristics of the integrated group delay characteristics of the low
pass filter 6 and the first delay circuit 7 have the same value.
[0005]
Next, the operation will be described.
The input acoustic signal is input to the phase equalizer 3 via the high pass filter 2. The phase
equalizer 3 gives in advance a group delay characteristic such that the combined group delay
characteristic of the front speaker 5 and the phase equalizer 3 becomes substantially constant
regardless of the frequency, as indicated by 11 in FIG. As a result, the acoustic signal output from
the front speaker 5 has substantially constant group delay characteristics with respect to the
input acoustic signal regardless of the frequency.
[0006]
On the other hand, the input acoustic signal passes through the low pass filter 6 and is delayed
by the first delay circuit 7 so as to have the same group delay as the acoustic signal radiated
from the front speaker 5. As a result, except for the vicinity of the lowest resonance frequency of
the woofer 9, the two-way speaker has substantially constant group delay characteristics
regardless of the frequency.
[0007]
FIG. 15 shows the structure of a television system to which the above-mentioned sound
reproducing apparatus for reproducing is applied using different speakers and amplifiers for
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2
each band. In the figure, 21 is a television system, 22 is a woofer cabinet, and 23 is a distance L
from a front speaker 5 provided on the front of the television system to the woofer 9. FIG. 16 is a
diagram showing the group delay characteristics of the sound reproduction apparatus according
to the configuration of FIG. In the figure, 25 is the group delay characteristic of the woofer 9, and
26 is the general group delay characteristic.
[0008]
As described above, in the sound reproducing apparatus having the structure in which the
woofer 9 is behind the front speaker 5 by the distance L23, when the sound is radiated at the
same time as the front speaker 5, the reproduced sound of the woofer 9 reaches the listener.
There is a problem that it is delayed by a time corresponding to the distance L23. Although the
case where it applies to a television system was shown here, the same problem arises in the
sound reproduction apparatus from which the distance of a front speaker and a woofer becomes
a different speaker arrangement from a listener's viewpoint. Furthermore, although a large group
delay occurs at the lowest resonance frequency of the unit, there is also a problem that the
correction of the group delay of the use reproduction band of the woofer 9 is not performed.
[0009]
The present invention has been made to solve the above-mentioned problems, and it is an object
of the present invention to provide an acoustic reproduction device having substantially constant
delay characteristics over the entire reproduction frequency band in which the front speaker and
the woofer are combined. .
[0010]
A sound reproducing apparatus according to the present invention comprises an electro-acoustic
transducer for low-frequency reproduction and an electro-acoustic transducer for medium-highfrequency reproduction, which is driven by different amplifiers. A low-pass filter for extracting
the low-pass component of the input acoustic signal, an amplifier for driving the lowreproduction electro-acoustic transducer, an electro-acoustic transducer for low-pass
reproduction, and a middle-high range component of the acoustic signal High-pass filter to be
taken out, group delay time occurring at lowest resonance frequency of low-pass reproduction
electro-acoustic transducer, attachment position of the low-pass reproduction electro-acoustic
transducer and middle-high-pass reproduction electro-acoustic transducer A delay circuit that
corrects time, a phase equalizer that corrects the group delay in the reproduction frequency band
of the mid-high range reproduction electro-acoustic transducer to a constant, an amplifier for
driving the mid-high range reproduction electro-acoustic transducer, and Characterized in that it
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has an electro-acoustic transducer of frequency playback.
[0011]
A low pass filter for extracting low frequency components of an input acoustic signal in an audio
reproduction apparatus having a low frequency reproduction electro-acoustic transducer and a
middle high frequency reproduction electro-acoustic transducer, each of which is driven by
different amplifiers An amplifier for driving a low-range reproduction electro-acoustic
transducer, a high-pass filter for extracting a low-range reproduction electro-acoustic transducer,
a mid-high range component of the acoustic signal, and a low-range reproduction electroacoustic transducer A delay circuit for correcting the group delay time occurring at the lowest
resonance frequency, and the time generated at the mounting position of the low-frequency
reproduction electroacoustic transducer and the mid-high frequency reproduction electroacoustic transducer, and the mid-high frequency reproduction electro-acoustic transducer Phase
equalizer which corrects the group delay in the reproduction frequency band of a constant, the
inverse filter having the inverse characteristic of the reproduction amplitude characteristic of the
electroacoustic transducer of the middle to high frequency reproduction, and the electroacoustic
transducer of the middle to high frequency reproduction An amplifier for, and having an
electrical transducer middle and high frequency reproduction.
[0012]
Furthermore, a low-pass filter for extracting low-pass components of an input acoustic signal in
an audio reproduction apparatus having a low-range reproduction electro-acoustic transducer
and a middle-high-range reproduction electro-acoustic transducer, each of which is driven by
different amplifiers A cyclic reverberation generator for adding a reverberation component to an
output signal of a low pass filter, an amplifier for driving a low band reproduction electroacoustic transducer, a low band reproduction electro-acoustic transducer, and the acoustic signal
A high pass filter for extracting the middle and high frequency components, a group delay time
occurring at the lowest resonance frequency of the low frequency reproduction electroacoustic
transducer, and the low frequency reproduction electroacoustic transducer and the middle high
frequency reproduction electroacoustic transducer A delay circuit that corrects the time that
occurs at the mounting position, a phase equalizer that corrects the group delay in the playback
frequency band of the mid-high range playback electro-acoustic transducer to a constant, and an
mid-high range playback electro-acoustic transducer An amplifier that is characterized by having
an electro-acoustic transducer of middle and high frequency reproduction.
[0013]
A low pass filter for extracting low frequency components of an input acoustic signal in an audio
reproduction apparatus having a low frequency reproduction electro-acoustic transducer and a
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middle high frequency reproduction electro-acoustic transducer, each of which is driven by
different amplifiers A cyclic reverberation generator for adding a reverberation component to an
output signal of a low pass filter, an amplifier for driving a low band reproduction electroacoustic transducer, a low band reproduction electro-acoustic transducer, and the acoustic signal
A high pass filter for extracting the middle and high frequency components, a group delay time
occurring at the lowest resonance frequency of the low frequency reproduction electroacoustic
transducer, and the low frequency reproduction electroacoustic transducer and the middle high
frequency reproduction electroacoustic transducer A delay circuit that corrects the time that
occurs at the mounting position, a phase equalizer that corrects the group delay in the
reproduction frequency band of the mid-high range reproduction electroacoustic transducer to a
constant, and a reproduction vibration of the medium-high range reproduction electroacoustic
transducer To the inverse filter having an inverse characteristic of the characteristic, an amplifier
for driving the electro-acoustic transducer of the intermediate and high frequency reproduction,
comprising the electro-acoustic transducer of the middle and high frequency reproduction.
[0014]
Furthermore, a low-pass filter for extracting low-pass components of an input acoustic signal in
an audio reproduction apparatus having a low-range reproduction electro-acoustic transducer
and a middle-high-range reproduction electro-acoustic transducer, each of which is driven by
different amplifiers An acyclic reverberation generator for adding a reverberation component to
an output signal of a low pass filter, an amplifier for driving an electro-acoustic transducer for
low-pass reproduction, an electro-acoustic transducer for low-pass reproduction, and the acoustic
signal High-pass filter for taking out the middle-high range component, group delay time
occurring at the lowest resonance frequency of the low-range reproduction electro-acoustic
transducer, the above-mentioned low-range reproduction electro-acoustic transducer and middlehigh range reproduction electro-acoustic transducer Delay circuit that corrects the time that
occurs at the mounting position of the phase, a phase equalizer that corrects the group delay in
the playback frequency band of the mid-high range playback electro-acoustic transducer
constant, and the mid-high range playback electro-acoustic transducer An amplifier for, and
having an electrical transducer middle and high frequency reproduction.
[0015]
A low pass filter for extracting low frequency components of an input acoustic signal in an audio
reproduction apparatus having a low frequency reproduction electro-acoustic transducer and a
middle high frequency reproduction electro-acoustic transducer, each of which is driven by
different amplifiers An acyclic reverberation generator for adding a reverberation component to
an output signal of a low pass filter, an amplifier for driving an electro-acoustic transducer for
low-pass reproduction, an electro-acoustic transducer for low-pass reproduction, and the acoustic
signal High-pass filter for taking out the middle-high range component, group delay time
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occurring at the lowest resonance frequency of the low-range reproduction electro-acoustic
transducer, the above-mentioned low-range reproduction electro-acoustic transducer and middlehigh range reproduction electro-acoustic transducer A delay circuit that corrects the time that
occurs at the mounting position of the phase, a phase equalizer that corrects the group delay in
the reproduction frequency band of the middle-high range reproduction electroacoustic
transducer to a constant, reproduction of the middle-high range reproduction electroacoustic
transducer To the inverse filter having an inverse characteristic of the width characteristics, an
amplifier for driving the electro-acoustic transducer of the intermediate and high frequency
reproduction, comprising the electro-acoustic transducer of the middle and high frequency
reproduction.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION In the sound reproducing apparatus
according to the embodiment of the present invention, the woofer reproduction timing and the
front speaker reproduction timing are the same, and the group delay time is constant over the
entire reproduction frequency band. It becomes possible to play.
[0017]
Further, the timing of the woofer reproduction and the timing of the front speaker reproduction
are the same, and it becomes possible to reproduce with a constant group delay time over the
entire reproduction frequency band.
Furthermore, the reproduction amplitude characteristic of the front speaker becomes flat.
[0018]
Furthermore, the woofer reproduction timing and the front speaker reproduction timing become
the same, and it becomes possible to reproduce with a constant group delay time over the entire
reproduction frequency band.
Furthermore, a reverberation component is added to the bass.
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[0019]
Further, the timing of the woofer reproduction and the timing of the front speaker reproduction
are the same, and it becomes possible to reproduce with a constant group delay time over the
entire reproduction frequency band.
Furthermore, the reproduction amplitude characteristic of the front speaker becomes flat.
Also, a reverberation component is added to the bass.
[0020]
Furthermore, the timing of the woofer reproduction and the timing of the front speaker
reproduction are the same, and it becomes possible to reproduce with a constant group delay
time over the entire reproduction frequency band.
Furthermore, any reverberation component is added to the bass.
[0021]
Further, the timing of the woofer reproduction and the timing of the front speaker reproduction
are the same, and it becomes possible to reproduce with a constant group delay time over the
entire reproduction frequency band.
Furthermore, the reproduction amplitude characteristic of the front speaker becomes flat.
In addition, any reverberation component is added to the bass.
[0022]
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7
The present invention will be specifically described below based on the drawings showing the
embodiments thereof.
Embodiment 1 FIG. 1 is a block diagram showing the configuration of a sound reproduction
apparatus according to a first embodiment of the present invention. In the figure, reference
numerals 1 to 9 indicate the same parts as the conventional method shown in FIG. 13, and the
description thereof will be omitted here. A second delay circuit 31 compensates for the delay due
to the group delay and the distance occurring at the lowest resonance frequency of the woofer 9.
FIG. 2 is a diagram showing the characteristics of the group delay, 11 is a general group delay
characteristic of the phase equalizer 3 and the front speaker 5, 33 is a group delay characteristic
of the second group delay circuit, 34 is the phase equalizer 3 and the front speaker 5 And the
second delay circuit, all integrated group delay characteristics.
[0023]
Next, the operation will be described. The sound signal input from the input end 1 is banddivided by the low pass filter 6 and the high pass filter 2, and then the signal of the high pass
filter 2 is that of the woofer 9 as shown by 33 in FIG. The group delay characteristic is corrected
by the second delay circuit 31 having the group delay characteristic and the characteristic for
correcting the delay generated at the distance L23. Therefore, the group delay characteristic
radiated from the front speaker 5 is a characteristic obtained by adding the characteristics 11
and 33. Further, as shown by the characteristic 34, the comprehensive group delay characteristic
with the woofer 9 becomes a constant characteristic at a frequency higher than the lowest
resonance frequency of the woofer 9.
[0024]
Here, the second delay circuit 31 and the phase equalizer 3 may be configured by non-recursive
digital filters as shown in FIG. In the case of the non-recursive digital filter shown in FIG. 3, the
delay amount can be changed by shifting the peak position of the coefficient introduced into the
filter.
[0025]
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8
Second Embodiment FIG. 4 is a block diagram showing the configuration of a sound reproducing
apparatus according to a second embodiment of the present invention. In the figure, reference
numeral 41 denotes an amplitude inverse filter which performs correction so that the
reproduction amplitude frequency characteristic of the front speaker 5 becomes flat. FIG. 5 is an
explanatory view of a method of correcting the amplitude characteristic by the inverse filter. In
the figure, 42 is a reproduction amplitude characteristic of the front speaker 5, 43 is a
characteristic of the amplitude inverse filter 41, and 44 is a reproduction characteristic after
using the amplitude inverse filter.
[0026]
Next, the operation will be described. In the same manner as in the first embodiment, the input
acoustic signal can be stabilized in the group delay characteristic. Furthermore, the inverse
amplitude filter 41 has the inverse characteristic of the reproduction amplitude characteristic of
the front speaker 5 as indicated by the characteristic 43 in FIG. 5, and performs convolution on
the acoustic signal after correction of the group delay. As a result, the group delay characteristic
is constant regardless of the frequency as shown by the characteristic 34 of FIG. 2, and the
amplitude characteristic is flat as shown by 44 of FIG.
[0027]
Here, the inverse characteristic of the amplitude inverse filter is the inverse characteristic of the
characteristic of the front speaker 5, but as shown in FIG. 6, when the sound conduit 45 is
attached to the front of the front speaker 5, the inverse including the sound conduit Also, in the
case where various acoustic resistances such as saran net are included, they may be reversed
characteristics of the state including the respective structures.
[0028]
When a delay occurs in the amplitude inverse filter 41, the delay amount of the second delay
circuit 31 may be reduced by the delay amount in advance.
[0029]
Furthermore, the second delay circuit 31, the phase equalizer 3 and the amplitude inverse filter
41 may be configured by one non-recursive digital filter shown in FIG.
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9
At that time, the characteristic of the high pass filter 2 may be taken.
[0030]
Third Embodiment
FIG. 7 is a block diagram showing the configuration of a sound reproducing apparatus according
to a third embodiment of the present invention. In the figure, 51 is a cyclic reverberation
generator, 52 is a third delay circuit for delaying, 53 is a multiplier for limiting the feedback
amount, 54 is a signal delayed by the third delay circuit 52 and a low pass filter It is an adder
that adds the signal of 6. FIG. 8 shows the operation of the cyclic reverberation generator 51. As
shown in FIG.
[0031]
Next, the operation will be described. As in the first embodiment, the reproduction group delay
characteristics of the front speakers 5 and the woofer 9 are constant. Further, a reverberation
component as shown in FIG. 8 is added to the signal of the low pass filter 6 by a cyclic
reverberation generator 51 including a third delay circuit 52, a multiplier 53 and an adder 54,
and the woofer 9 Sound reproduction including this reverberation component is performed.
[0032]
Fourth Embodiment FIG. 9 is a block diagram showing the configuration of a sound reproduction
device according to a fourth embodiment of the present invention.
[0033]
Next, the operation will be described. As in the second embodiment, the reproduction group
delay characteristics of the front speakers 5 and the woofer 9 are constant, and the reproduction
08-05-2019
10
amplitude characteristics are also constant. Further, a reverberation component as shown in FIG.
8 is added to the signal of the low pass filter 6 by a cyclic reverberation generator 51 including a
third delay circuit 52, a multiplier 53 and an adder 54, and the woofer 9 Sound reproduction
including this reverberation component is performed.
[0034]
Embodiment 5 FIG. 10 is a block diagram showing the configuration of a sound reproducing
apparatus according to a fifth embodiment of the present invention. FIG. 11 is a diagram showing
the operation of the acyclic reverberation generator 61. As shown in FIG.
[0035]
Next, the operation will be described. As in the first embodiment, the reproduction group delay
characteristics of the front speakers 5 and the woofer 9 are constant. Further, a reverberation
component as shown in FIG. 11 is added to the signal of the low pass filter 6 by the nonrecursive reverberation generator 61 comprising the delay group 62, the multiplier group 63
and the adder 64, and the woofer 9 Sound reproduction including this reverberation component
is performed. The acyclic reverberation generator 61 can set the reverberation level at each time
by arbitrarily setting each multiplication coefficient of the multiplier group 63.
[0036]
Sixth Embodiment FIG. 12 is a block diagram showing the configuration of a sound reproducing
apparatus according to a sixth embodiment of the present invention.
[0037]
Next, the operation will be described. As in the second embodiment, the reproduction group
delay characteristics of the front speakers 5 and the woofer 9 are constant, and the reproduction
amplitude characteristics are also constant. Further, a reverberation component as shown in FIG.
11 is added to the signal of the low pass filter 6 by the non-recursive reverberation generator 61
comprising the delay group 62, the multiplier group 63 and the adder 64, and the woofer 9
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Sound reproduction including this reverberation component is performed.
[0038]
Since the present invention is configured as described above, the following effects can be
obtained.
[0039]
Since the delay characteristic reverse to the delay characteristic generated by the woofer is
added to the front speaker, the total reproduction group delay characteristic of the woofer and
the front speaker is constant regardless of the frequency.
[0040]
In addition, since a delay characteristic reverse to the delay characteristic occurring in the woofer
is added to the front speaker, and an inverse filter for correcting the reproduction amplitude
characteristic of the front speaker is added, the total reproduction group delay of the woofer and
the front speaker is added. The characteristics are constant regardless of the frequency, and the
reproduction amplitude frequency characteristics are also constant regardless of the frequency.
[0041]
Furthermore, since it was configured to add a delay characteristic opposite to the delay
characteristic generated in the woofer to the front speaker and further to add a reverberation
component to the woofer, the total reproduction group delay characteristic of the woofer and the
front speaker has a frequency It becomes constant regardless, and can further enhance the
regenerated energy of the bass without raising the level of the amplifier.
[0042]
Moreover, since it was comprised so that the inverse filter which correct | amends the
reproduction | regeneration amplitude characteristic of front speaker itself and a delay
characteristic reverse to the delay characteristic which arises in a woofer may be added to a front
speaker, and it is comprised so The overall playback group delay characteristics and playback
amplitude characteristics of the woofer and front speaker become constant regardless of the
frequency, and further it is possible to enhance the bass playback energy without raising the
level of the amplifier.
[0043]
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12
Furthermore, since it is configured to add to the front speaker a delay characteristic opposite to
the delay characteristic generated by the woofer, and further to add a reverberation component
of an arbitrary characteristic to the woofer, the overall reproduction of the woofer and the front
speaker The group delay characteristic is constant regardless of the frequency, and the
regenerated energy of the bass can be enhanced without increasing the level of the amplifier.
[0044]
In addition, it is configured to add an inverse filter that corrects the delay characteristic reverse
to the delay characteristic that occurs in the woofer to the front speaker and the reproduction
amplitude characteristic of the front speaker itself, and to add a reverberation component of an
arbitrary characteristic to the woofer. Since the system is configured, the overall reproduction
group delay characteristics and reproduction amplitude characteristics of the woofer and the
front speaker become constant regardless of the frequency, and it is possible to further enhance
the reproduction energy of the bass without raising the level of the amplifier.
[0045]
Brief description of the drawings
[0046]
FIG. 1 is a block diagram showing a configuration of a sound reproduction device according to a
first embodiment of the present invention.
[0047]
FIG. 2 is a diagram showing characteristics of group delay according to the configuration of FIG.
1;
[0048]
FIG. 3 is a diagram showing the configuration of a phase equalizer and a second delay circuit of
the first embodiment.
[0049]
FIG. 4 is a block diagram showing a configuration of a sound reproduction device according to a
second embodiment of the present invention.
08-05-2019
13
[0050]
FIG. 5 is an explanatory view of a correction method of amplitude characteristics by an inverse
filter.
[0051]
FIG. 6 is a view showing the configuration of a speaker in the case where a sound conduit 45 is
attached to the front of a front speaker 5;
[0052]
FIG. 7 is a block diagram showing a configuration of a sound reproduction device according to a
third embodiment of the present invention.
[0053]
FIG. 8 is a diagram showing an operation of a cyclic reverberation generator 51.
[0054]
FIG. 9 is a block diagram showing a configuration of a sound reproduction device according to a
fourth embodiment of the present invention.
[0055]
FIG. 10 is a block diagram showing a configuration of a sound reproduction device according to a
fifth embodiment of the present invention.
[0056]
FIG. 11 is a diagram showing an operation of the acyclic reverberation generator 61.
[0057]
FIG. 12 is a block diagram showing a configuration of a sound reproduction device according to a
sixth embodiment of the present invention.
[0058]
FIG. 13 is a diagram showing a configuration of a conventional sound reproducing apparatus.
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[0059]
FIG. 14 is a diagram showing group delay characteristics according to a conventional example.
[0060]
FIG. 15 is a view showing the arrangement of speakers by the sound reproducing apparatus.
[0061]
FIG. 16 is a diagram showing the group delay characteristics of the sound reproduction
apparatus according to the conventional configuration.
[0062]
Explanation of sign
[0063]
2 high pass filter, 3 phase equalizer, 4 front speaker amplifier, 5 front speaker, 6 low pass filter,
8 woofer amplifier, 9 woofer, 31 second delay circuit.
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