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JP2002354577

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DESCRIPTION JP2002354577
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
voice processing device and an electronic apparatus having the voice processing device. In
particular, the present invention can be applied as an audio processing device mounted on an
electronic device such as a television receiver using a small aperture speaker.
[0002]
2. Description of the Related Art A television receiver equipped with a speaker having a small
aperture has the following features. That is, as a small-aperture speaker used for a television
receiver, the speaker aperture size is much smaller than that of an audio speaker, and it does not
have a very low frequency range, so it is difficult to reproduce the speaker. The frequency band
is also poor to cover the whole range.
[0003]
Here, the small diameter speaker generally refers to a speaker having a diameter of 9 cm or less,
as described in, for example, "Speaker basic knowledge" (an article published on the homepage of
Matsushita Electronic Components Co., Ltd.) However, at present, in the case of a CRT (Brown
Tube) television receiver, a speaker with a diameter of 8 cm or less is referred to as a speaker
with a diameter of 4 cm or less in the case of a liquid crystal display television receiver. It is
common to
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[0004]
When a speaker is attached to a cabinet of a television receiver, if it is indented and attached only
by the thickness of the baffle plate, the influence of the dent causes peaks and valleys in the
acoustic characteristics.
The size (depth) of the peak and valley of this acoustic characteristic increases significantly as
the quotient value obtained by dividing the aperture of the speaker by the size (depth) of the
recess corresponding to the thickness of the baffle plate becomes smaller. Therefore, it is
necessary to pay attention to the small diameter speaker and the mounting method of the
speaker. That is, in order to keep the change in acoustic characteristics due to the depression
within an allowable range, generally, the ratio a / l of the effective vibration radius a of the
speaker to the depth l of the depression is set to (4 to 5) or more. This is very important.
Furthermore, the directivity of the speaker is degraded as the depth of the recess is deeper.
[0005]
For example, as in the case of most current liquid crystal television receivers, when the external
dimension of the speaker is 4 cm, the effective vibration radius a of the speaker is 2 cm or less,
and the depth l of the recess is 1 cm. The value of a / l is 2 or less. In such a case, as described in
"Speaker" written by Heitaro Nakajima (Japan Broadcasting and Publishing Association), as
shown in the frequency characteristic diagram of Fig. 4, a peak tends to occur in the mid-range
frequency band It becomes an acoustic characteristic, which may result in an unnatural sound
quality in which the output level of the low band and high band is lowered.
[0006]
Therefore, as shown by an example in the frequency characteristic diagram of FIG. 5, in the prior
art, it is difficult to output the low frequency band with a small aperture speaker, so when the
output volume from the television receiver is small, As shown in curve 1 of FIG. 5, the output
gain (compared to the mid-range frequency band as the low-frequency band and vice versa,
centering on the central portion of the frequency band) That is, amplification is performed so as
to increase the amplification degree in the output audio signal, while when the output volume
from the television receiver is large, as shown by curve 2 in FIG. Loudness techniques that
perform auditory correction are common, as amplification is done to flatten the gain (i.e. the
amplification to the output audio signal).
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[0007]
As the loudness technology in the case of using such a small aperture speaker, Japanese Patent
Application Laid-Open No. 10-173459 "Acoustic device", Japanese Patent Application Laid-open
No. 9-182197 "Loudness circuit", Japanese Patent Application Laid-open No. 6-232662 "Volume
control device", There is a technique disclosed in Japanese Patent Application Laid-Open No. 1200812 "automatic loudness compensation device" and the like.
That is, the invention disclosed in Japanese Patent Application Laid-Open No. 10-173459 is
directed to the second embodiment in which the amplification of the output sound volume is
predetermined when the amplification degree by emphasis designation in the low sound range
and the high sound range exceeds a predetermined threshold. When it is specified to be larger
than the threshold value, the emphasis specification value in the bass and treble range is
decreased so that the distortion of the output in the bass and treble range is not emphasized.
[0008]
Further, the invention in Japanese Patent Application Laid-Open No. 9-182197 performs control
to suppress the output of the bass region as the output volume becomes larger, and enables on /
off control of the enhancement function (loudness function) of the bass region. As an attempt to
distinguish the effect of the bass enhancement function.
[0009]
Further, the invention in Japanese Patent Laid-Open No. 6-232662 divides an input voice signal
into voice signals of a plurality of frequency bands using a high pass filter and a low pass filter,
and independently controls the output volume of each frequency band. By controlling each
attenuation to be able to change the amount of attenuation based on the specified output volume
size by each of the available attenuators, arbitrary bass and treble range output depending on the
volume of the output volume It is intended to obtain a loudness characteristic without distortion
that emphasizes
[0010]
In the invention disclosed in JP-A-1-200812, when the output volume is small, the low and high
range bands are amplified and the output volume is large due to the tapped volume adjustment
volume when the output volume is small. In this case, the low and high frequency bands are
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attenuated as compared to the middle frequency band, and natural sound quality is intended to
be output regardless of the volume size.
[0011]
However, for example, in the case of using a small aperture speaker as in the case of a television
receiver, in the case where the volume of output from an electronic device such as a television
receiver is small, the above-mentioned. Although it is possible to apply various conventional
techniques, the influence of the depression when the speaker is attached to a cabinet of an
electronic device such as a television receiver is not taken into consideration.
That is, in such a prior art, as the output volume increases, the bass band becomes richer, while
the treble band attaches a speaker to a cabinet of an electronic device such as a television
receiver. Because of the influence of the above-mentioned depressions, peaks occur in the midrange band, causing loud noises, which makes it very difficult to maintain the sound quality. .
The present invention has been made in view of the above problems, and provides an audio
processing apparatus capable of improving the sound quality by performing appropriate audio
processing even when the output volume is large, and the audio processing It is an object of the
present invention to provide an electronic device provided with a device.
[0012]
A first technical means is an audio processing apparatus comprising an audio processing circuit,
a volume control unit, an audio output unit, and a speaker, wherein the audio processing circuit
amplifies an input audio signal. The amplification means for outputting an audio signal, the
filtering means for outputting as a filtered amplified audio signal obtained by filtering a specific
frequency band of the amplified audio signal based on a predetermined output frequency
characteristic, and the above according to the size of the output volume An output adjusting
means for outputting as an adjusted filtering amplified audio signal in which the output level of
the filtering amplified audio signal is adjusted, and an adding means for adding a plurality of
audio signals, wherein the output adjusting means is an output volume specified by the user The
output of the filter means is controlled in conjunction with the control of the volume control unit
which is controlled to The output level is adjusted and controlled based on the magnitude of the
output sound volume, and the filtering amplification audio signal is output from the output
adjusting unit as the adjustment filtering amplification audio signal, and the amplification audio
signal and the filtering audio signal The adjustment filtering amplification audio signal is added
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by the addition means to be an output audio signal, and the audio processing apparatus is
characterized in that it is output to the speaker through the audio output unit.
[0013]
A second technical means is the voice processing device according to the first technical means,
wherein, when the speaker is a small aperture speaker, the amplified voice signal in which the
filter characteristic of the filter means is amplified by the amplifying means A voice processing
apparatus having a characteristic of attenuating the mid-range band relative to the low-pitch
band and amplifying the high-pitch band relative to the low-band band. is there.
[0014]
A third technical means is the audio processing device according to the second technical means,
wherein the output level of the adjustment filtering amplified audio signal output from the output
adjusting means controlled in conjunction with the volume control unit is: When the output
volume is low, the flat characteristic is exhibited over all frequency bands, while as the output
volume increases, the attenuation of the midrange band is increased to amplify the high band. It
is characterized in that it is a voice processing device which is interlocked and controlled so as to
increase the amount.
[0015]
A fourth technical means is an electronic apparatus comprising the speech processing device
according to any one of the first to third technical means.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a voice processing device
and an electronic device equipped with the voice processing device according to the present
invention will be described below with reference to the drawings.
Here, as the electronic apparatus according to the present invention, any apparatus equipped
with a television receiver, a VTR, a PC, a control apparatus such as a car or an aircraft, and
further a voice processing apparatus for voice output such as a robot etc. Although an electronic
device may be used, in the following description of the embodiment, a television receiver will be
used as an example of the electronic device.
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[0017]
FIG. 1 is a circuit diagram showing an example of a specific circuit configuration of an audio
processing device according to the present invention and a television receiver on which the audio
processing device is mounted.
In FIG. 1, a television receiver 100 includes an audio processor 10 for processing audio signals, a
video processor 20 for processing video signals, a microcomputer 30 for controlling the entire
television receiver, and video signals. And an audio / video separation circuit 40 for separating
audio and audio signals.
[0018]
The video processing apparatus 20 also includes a video signal processing circuit 21 which
extracts various control signals from the video signal and restores them into video information
capable of video display, and a video output circuit which amplifies the video information and
outputs it to the video display unit 23 22, an image display unit 23 made of a CRT, liquid crystal
or the like.
On the other hand, the audio processing device 10 includes a volume control circuit 1 for setting
and controlling an output volume to a volume level desired by the user 1, an audio processing
circuit 2 for performing audio processing to ensure sound quality, and an output for the speaker
4 An audio output circuit 3 for amplifying the signal, a speaker 4 and the like are provided.
[0019]
A television broadcast signal from an antenna (not shown) is demodulated and then separated
into a video signal and an audio signal by the video / audio separation circuit 40, and then the
video signal is input to the video processing device 20, The signal is input to the speech
processing device 10.
The video signal input to the video processing device 20 is subjected to signal processing by the
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video signal processing circuit 21 to be restored to video information capable of displaying a
video, and then amplified by the video output circuit 22 to display the video. The output is
displayed on the unit 23.
On the other hand, the audio signal input to the audio processing device 10 is amplified and
attenuated to the audio signal level desired by the user by the volume control circuit 1, and then
input to the audio processing circuit 2. Furthermore, in the volume control circuit 1, as in the
prior art described above, the output level of each band in the low band and the high band is
further emphasized compared to the output level in the band of the middle band and output.
good. The audio signal input to the audio processing circuit 2 is subjected to adjustment control
in conjunction with the operation of the volume control circuit 1 in accordance with the
magnitude of the output volume, and then from the speaker 4 via the audio output circuit 3 It is
output.
[0020]
Here, the circuit operation of the audio processing circuit 2 will be described according to FIG. In
FIG. 1, the audio signal input from the volume control circuit shown as Input is amplified by the
pre-stage amplifier 5 and then branched into two as an amplified audio signal and output. One of
the branched amplified audio signals is input to a frequency setting amplifier 6 having a function
of filtering and outputting only a predetermined specific frequency band (ie, realizing filter
means), and is determined in advance. Only the amplified voice signal of the characteristic
frequency component is subjected to amplification and attenuation processing based on a
predetermined output frequency characteristic, and is output as a filtering amplified voice signal,
and then input to the electronic volume 7.
[0021]
Here, in the case where a small aperture speaker is attached to a cabinet as in a television
receiver, the frequency setting amplifier (that is, filter means) 6 sets the frequency of the low
frequency band of the input amplified audio signal. The amplified voice signal in the mid-range
frequency band is attenuated according to a predetermined attenuation amount as compared to
the amplified voice signal in the band, while the amplified voice signal in the high-tone frequency
band is predefined. A filtering process is performed to amplify according to the amplification
amount, and the filtered amplified audio signal is output.
[0022]
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The electronic volume 7 is controlled in conjunction with the control to the volume control
circuit 1 in accordance with the output volume level to provide an output adjusting means for
setting the output level to a desired level, It is an attenuator (ATT: Attenuator) controlled in
conjunction with the volume control unit of the television receiver.
That is, an instruction similar to the calculated voltage setting instruction value is input from the
microcomputer for controlling the voice processing apparatus to control the volume control unit
in accordance with the desired output volume level set by the user. Thus, the output level of the
input filtered and amplified audio signal is adjusted, and the adjusted filtered and amplified audio
signal is input to the adder circuit of the summing amplifier 8.
[0023]
On the other hand, after being amplified as an amplified voice signal in the pre-stage amplifier 5,
the other amplified voice signal branched into two is input to the other summing circuit side of
the summing amplifier 8, and the adjustment filtering amplified voice signal And the signal is
added between them and output from the summing amplifier 8 as an output voice signal. The
output sound signal shown as Output in FIG. 1 is led to the sound output circuit at the
subsequent stage to drive the speaker.
[0024]
FIG. 2 is a frequency characteristic diagram showing an example of the frequency characteristic
of the output sound signal in the sound processing apparatus according to the present invention.
That is, the frequency characteristic of the output sound signal indicates the output characteristic
regarding the output level for each frequency of the output sound signal (Output) which is the
output signal of the summing amplifier 8 shown in FIG. Here, in order to control the frequency
characteristics of the output audio signal (Output) which is the output signal of the summing
amplifier 8 shown in FIG. 1 as shown in FIG. 2, the frequency setting amplifier (filter means) 6
and electronic volume in FIG. (Attenuator) 7 is provided.
[0025]
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As will be described later, in the frequency setting amplifier (filter means) 6, filtering control is
performed so as to give a frequency characteristic as shown by a curve 2 (broken line), and it is
output as a filtering amplified audio signal. That is, the frequency setting amplifier (filter means)
6 is controlled to output the attenuated output voice signal in the mid band compared to the low
band, and in the high band, Control is performed so as to output an amplified output audio
signal, and a filtered amplified audio signal having a frequency as shown by curve 2 (broken line)
is output.
[0026]
On the other hand, in the electronic volume (output adjusting means) 7, the output level of the
filtering amplified audio signal having a frequency characteristic as shown by the curve 2
(broken line) is outputted from the frequency setting amplifier (filter means) 6 Depending on the
size, it is controlled and controlled so that the output level decreases as the output volume
decreases. Thus, when the magnitude of the output sound volume is set to the minimum, the
adjustment filtering amplified audio signal having flat frequency characteristics like curve 1 will
be output.
[0027]
An output of the summing amplifier 8 is obtained by the signal addition of the adjustment
filtering amplification voice signal which is the output signal of the electronic volume (output
adjusting means) 7 and the amplification voice signal which is the output signal of the pre-stage
amplifier 5 in the summing amplifier 8 It is output as an output audio signal (Output) which is a
signal, and is controlled so as to obtain frequency characteristics as shown in FIG. 2 as frequency
characteristics of the output audio signal (Output).
[0028]
In the frequency characteristic diagram of FIG. 2, the vertical axis represents the output gain
(gain) of the output voice signal normalized by expressing the output gain (gain) of the output
voice signal at a frequency of 1 kHz shown on the horizontal axis as a reference gain. ing.
That is, the reference gain at a frequency of 1 kHz, which is the boundary frequency between the
low range and the mid range, is displayed as 0 dB. Further, the horizontal axis represents the
08-05-2019
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range of the frequency band ranging from 10 Hz to 20 kHz as a logarithmic scale, and the
central portion of the horizontal axis is schematically represented as the frequency 1 kHz. Thus,
in the audio processing apparatus according to the present invention, when the output volume is
small, as shown by curve 1 (solid line) in FIG. 2, the reference gain 0 dB is maintained in a wide
frequency band from 10 Hz to 20 kHz. It has flat frequency characteristics.
[0029]
On the other hand, when the output volume increases, as shown by the curve 2 (dotted line) in
FIG. 2, the attenuated output audio signal is output in the middle band compared to the low band.
It is controlled to be controlled so that a more amplified output speech signal is output in the
high frequency band.
[0030]
By giving such frequency characteristics, as the output sound volume increases, the band of the
low tone range becomes rich, while the high tone range is provided for attaching the speaker to
the cabinet of the television receiver. It becomes possible to solve the problem of loud noise due
to the occurrence of peaks in the midrange band under the influence of the above-mentioned
depressions.
[0031]
Further, FIG. 3 shows a general characteristic diagram relating to the output gain characteristic
in the case where the sound volume control circuit (that is, the sound volume control unit)
variably controls the sound volume, and the output whose horizontal axis is designated by the
user The magnitude of the volume is shown, and the vertical axis shows the gain of the output
sound signal for the specified output volume.
[0032]
In FIG. 3, the horizontal axis indicates the case where the volume of the volume is displayed as a
volume bar on the volume display screen of the television receiver in a range ranging from (0 to
60), and the user can The volume bar can be manipulated to specify the desired output volume.
On the other hand, the vertical axis shows attenuation gain characteristics, and the output sound
when the volume consisting of the input voltage value of the speaker which is the acoustic
conversion device is set to the maximum value (ie, in the case of the volume screen display 60 in
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FIG. 3) The sound volume control circuit 1 shows an attenuation gain that attenuates the
difference from the reference level to the designated position of the output sound volume by the
attenuator (ATT), using the output gain of the signal as the reference level.
That is, FIG. 3 shows that a linear attenuation gain is given to the position of the volume bar.
[0033]
When the volume of the horizontal axis shown in FIG. 3 is changed so as to decrease the output
volume, the signal to reduce the output volume is output from the microcomputer as shown in
FIG. By being transmitted to the electronic volume (output adjustment means) 7 shown in FIG. 1,
an output audio signal having a flat frequency characteristic as shown by curve 1 (solid line) in
FIG. 2 is obtained. In the case of sequentially changing in the large direction, a signal to the effect
that the output volume has changed to a larger value is sequentially transmitted from the
microcomputer to the electronic volume (output adjustment means) 7 shown in FIG. As shown by
curve 2 (dotted line) in FIG. 2, an output speech signal showing a frequency characteristic is
gradually emphasized and outputted.
That is, it is possible to obtain a sound volume variable characteristic change which changes
between the frequency characteristic of curve 1 (solid line) and the frequency characteristic of
curve 2 (dashed line) shown in FIG. 2 according to the size of the output sound volume desired
by the user.
[0034]
That is, when the magnitude of the output sound volume is small, the adjustment filtering
amplification input to the summing amplifier 8 via the frequency setting amplifier (filter means)
6 and the electronic volume (output adjusting means) 7 shown in FIG. 1 Even if the signal level of
the audio signal is reduced by the electronic volume (output adjustment means) 7 and the signal
addition is performed to the amplified audio signal from the pre-stage amplifier 5, the signal
addition effect is small and the output audio signal from the summing amplifier 8 is The output
frequency characteristics show flat characteristics over a wide frequency band as shown by curve
1 (solid line) shown in FIG.
[0035]
On the other hand, when the magnitude of the output volume increases, addition is performed
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via the frequency setting amplifier (filter means) 6 and the electronic volume (output adjustment
means) 7 shown in FIG. 1 according to the level of the magnitude of the output volume. The
output frequency characteristic of the output voice signal from the summing amplifier 8 is shown
by the signal level of the adjustment filtering amplification voice signal input to the amplifier 8
becoming large and being added to the amplified voice signal from the pre-stage amplifier 5 As
shown by curve 2 (dashed line), the amplification gain is attenuated in the vicinity of the midrange band and the frequency characteristic is amplified in the high-range band as compared
with the low-band range.
[0036]
Thus, when the output volume is small, the flat characteristic is exhibited over all frequency
bands, while the attenuation of the midrange band is increased as the output volume increases,
and the high range is increased. By performing interlock adjustment control with the sound
volume control circuit 1 so as to increase the amplification amount of the band, it becomes
possible to obtain an output sound signal of high sound quality regardless of the volume size.
[0037]
As described above, according to the voice processing device according to the present invention
and the electronic device on which the voice processing device is mounted, the following effects
can be obtained.
That is, for example, in the case of an electronic device equipped with a small aperture speaker
such as a television receiver, when the output volume is set large, in the prior art, the bass range
is increased as the output volume increases. Of the high frequency band becomes louder because
the peak of the midrange band of (1 to 5) kHz is generated as the speaker aperture becomes
smaller. have.
[0038]
In the audio processing device according to the present invention, the output level of the
midrange band is controlled to be attenuated as compared to the output level of the bass range,
and the output level of the high range is further enhanced. It is possible to control the output
sound of natural sound quality regardless of the size of the output volume desired by the user.
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