close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JPWO2016013161

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPWO2016013161
Abstract A high-pass attenuation filter (11) for attenuating a signal component of a frequency
band higher than at least a predetermined frequency of an input speech signal, and a hearing aid
process for carrying out hearing aid processing on the speech signal output from the high-pass
attenuation filter (11) And a predetermined frequency is determined according to the upper limit
of the frequency band to be a target of hearing aid.
Signal processing apparatus and signal processing method
[0001]
The present invention relates to a signal processing apparatus and signal processing method for
performing hearing aid processing on a broadband audio signal output from a television or an
optical disc (DVD, Digital Versatile Disc), BD (Blu-ray (registered trademark) Disc), etc. About.
[0002]
FIG. 7 is a diagram for explaining the basic operation of the hearing aid processing.
The upper part of FIG. 7 shows the waveform of the signal before the hearing aid processing.
Also, the lower part of FIG. 7 shows the waveform of a signal subjected to hearing aid processing
to the signal shown in the upper part of FIG. That is, the basic operation of the hearing aid
processing is an operation of amplifying a small amplitude signal and maintaining a large
amplitude signal. Thus, the hearing aid process compensates for the hearing of a person whose
11-04-2019
1
dynamic range of perception of sound is reduced (that is, loud sounds are normal but small
sounds are not).
[0003]
Also, in recent years, there has been technology development of a television in which listeners
requiring hearing aid processing (hereinafter referred to as elderly people) and listeners not
required (hereinafter referred to as healthy persons) can simultaneously enjoy content. For
example, Patent Document 1 discloses the following technology.
[0004]
As the first technique, for the elderly, ordinary voices not subjected to hearing aid processing are
output from one of the speakers (for example, the left side), and sounds subjected to hearing aid
processing are output from the other (for example, the right side). Provide appropriate audio
from the right speaker.
[0005]
In addition, as a second technology, ordinary voices not subjected to hearing aid processing are
output from the left and right speakers, and voices subjected to hearing aid processing are
output separately from the strongly directional speaker, and thus provided separately to the
elderly. Provide appropriate sound from a highly directional speaker.
[0006]
In addition, as a third technique, normal voices not subjected to hearing aid processing are
output from the left and right speakers, and sounds subjected to hearing aid processing are
output from the headphones to provide appropriate voices from the headphones to the elderly.
[0007]
Japanese Patent Application Publication No. 2003-230071
[0008]
However, the sound of television in recent years is a wideband signal with a sampling frequency
11-04-2019
2
of 48 kHz (the reproduction band is 24 kHz), and a very large number of signals in a band not
requiring hearing aid processing are included.
FIG. 8 is a diagram for explaining a frequency band to be a target of hearing aid for a wide band
signal.
As shown in FIG. 8, in consideration of the fact that the band requiring hearing aid processing is
at most about 10 kHz, the sound of television will be too wide in frequency band.
[0009]
For example, FIG. 9 is a diagram showing an example of frequency components that interfere
with hearing aid processing.
(A) of FIG. 9 is a figure which shows the waveform of the audio | voice in which the signal with
small amplitude exists at the time A. FIG.
(B) of FIG. 9 is a figure which shows the frequency component of the signal in the time A of the
waveform of the audio | voice shown by (a) of FIG. (C) of FIG. 9 is a figure which shows the
waveform of the audio | voice in which the signal with a large amplitude exists in the time A. FIG.
(D) of FIG. 9 is a figure which shows the frequency component of the signal in the time A of the
waveform of the audio | voice shown by (c) of FIG.
[0010]
When the signal at time A shown in (a) of FIG. 9 is mainly composed of signal components in a
low frequency band as shown in (b) of FIG. The hearing aid processing is amplified to a loud
sound. However, as shown in (c) of FIG. 9, the signal with large amplitude at time A is over the
signal with small amplitude, and the signal with large amplitude is high as shown in (d) of FIG.
When the signal component of the frequency band is included, the signal component of the high
frequency band is detected as a signal with a large amplitude. As described above, in the prior
art, there is a problem that amplification of signal components of low frequency bands to be
originally amplified is inhibited. Note that the audio signals in (c) and (d) in FIG. 9 have artificially
11-04-2019
3
generated signal components of high frequency at time A with respect to the audio signals in (a)
and (b) in FIG. Added. However, even in actual content, it is often seen that metal background
sound gets mixed with speech, and in this case, the phenomenon described in FIG. 9 occurs.
[0011]
This tendency is more pronounced in optical disc contents. This is because the sampling
frequency of the audio of the content of the optical disk is not only 48 kHz, but also 96 kHz, 192
kHz, etc., so the audio of the content of the optical disk contains many signal components in a
very high frequency band. The signal components in these frequency bands inhibit the
amplification of the signal components in the frequency band that originally requires hearing aid.
[0012]
In addition, there are three techniques disclosed in the above-mentioned Patent Document 1 as a
method for a healthy person and an elderly person to enjoy content simultaneously, but there are
the following problems.
[0013]
In the first technique, signals emitted from the left and right speakers are mixed in space and are
not appropriately provided to healthy people and elderly people, respectively.
[0014]
In the second shown technique, it is necessary to install an extra directional speaker, which
makes the equipment expensive.
[0015]
In the third technique, elderly people have to wear headphones, and they feel a sense of
alienation in a haunted family group where families gather and enjoy the same television
program.
[0016]
11-04-2019
4
On the other hand, in recent years, inexpensive devices for wirelessly connecting speakers using
radio waves such as Bluetooth (registered trademark) have been commercialized.
Such a device is placed, for example, at the knees of an elderly person, to which a hearing aid
processed signal is provided.
Then, the normal sound is provided to the speaker of the device body.
Then, the above-mentioned three problems are all solved because the hearing aid processed
voice is reproduced only near the elderly people.
[0017]
However, in such a wireless speaker, when an audio signal is put on a radio wave, it is
compressed and encoded by a compression method in the frequency domain (SBC (SubBand
Codec), AAC (Advanced Audio Coding), etc.) and then transmitted. There is a problem of
deterioration.
FIG. 10 is a diagram for explaining a frequency band which is a target of bit allocation in
compression coding for a wideband signal. That is, in the compression method in the frequency
domain, when the frequency band of the input signal is wide, as shown in FIG. 10, the bit
allocation at the time of encoding becomes wide and shallow, so a low frequency to be a target of
hearing aid There is a problem that sufficient bit allocation can not be performed for the signal
component of the band, and the hearing aid signal is degraded.
[0018]
The present invention has been made in view of such conventional problems, and is capable of
performing a hearing aid process on a broadband audio signal output from a television or an
optical disc player with high accuracy, and performing the hearing aid process It is an object of
the present invention to provide a signal processing apparatus and a signal processing method
capable of compression coding with high sound quality.
[0019]
11-04-2019
5
In order to solve the above problems, a signal processing apparatus according to an aspect of the
present invention includes a high-pass attenuation filter for attenuating a signal component in a
frequency band higher than at least a predetermined frequency of an input audio signal; And a
hearing aid processing unit that performs hearing aid processing on the audio signal output from
the attenuation filter, wherein the predetermined frequency is determined according to the upper
limit of the frequency band to be subjected to hearing aid.
Thus, the audio signal output from the high-pass attenuation filter that attenuates the signal
component of the high frequency band of the wideband audio signal is subjected to hearing aid
processing. Therefore, the wide-band audio signal of a television or an optical disk is subjected to
hearing aid processing with high accuracy.
[0020]
And a first communication unit for transmitting the signal compression-encoded by the
compression encoding unit, the compression encoding unit compressing and encoding the signal
subjected to the hearing aid processing by the hearing aid processing unit, the compression
encoding unit The unit may compress and code the signal component of the frequency band to
be subjected to hearing aid by assigning a larger number of coding bits than other frequency
bands. As a result, the signal component of the frequency band to be a target of hearing aid is
compression-coded with a larger number of coding bits allocated than in the other frequency
bands, so that the signal subjected to hearing aid processing is compressed and coded with high
quality. Be done.
[0021]
Further, to solve the above problems, a signal processing apparatus according to an aspect of the
present invention compresses a signal that has been subjected to the hearing aid processing by
the hearing aid processing unit that performs hearing aid processing on the input audio signal. A
compression encoding unit for encoding and a first communication unit for transmitting a signal
compressed and encoded by the compression encoding unit, wherein the hearing aid processing
unit has an upper limit frequency of a frequency band to be a target of hearing aid Are
transmitted to the compression encoding unit, and the compression encoding unit is configured
to transmit to the signal component of the frequency band to be a target of hearing aid based on
11-04-2019
6
the frequency transmitted from the hearing aid processing unit as compared to other frequency
bands. A large number of encoding bits may be allocated for compression encoding. As a result,
the high-pass attenuation filter attenuates the signal components in the high frequency band to
automatically assign a large number of encoding bits to the signal components in the frequency
band in which the hearing aid processing has been performed. The upper limit frequency of the
frequency band to be set is transmitted to the compression coding unit, and the frequency band
to which the number of coding bits is assigned is specified. Therefore, even if the high-pass
attenuation filter is not provided, the signal subjected to the hearing aid processing is
compressed and encoded with high sound quality.
[0022]
Furthermore, a second communication unit that receives a signal from the first communication
unit, a decoding unit that decodes the signal received by the second communication unit into an
audio signal, and an audio that is decoded by the decoding unit A speaker for reproducing a
signal, the second communication unit, the decoding unit, and the speaker are integrated, and at
least the high-frequency attenuation filter, the hearing aid processing unit, the compression
encoding unit, And, it may be independent from the main device including the first
communication unit. As a result, the hearing aid processed signal is reproduced from the speaker
carried near the listener requiring the hearing aid processing, so that the listener requiring the
hearing aid and the listener not requiring the same hearing can enjoy the same content at the
same time .
[0023]
Further, the first communication unit further includes a reception function, and the second
communication unit transmits and receives a signal to and from the first communication unit,
and the signal processing device needs a hearing aid process or not The second communication
unit transmits the information specified by the specification unit to the first communication unit,
and the first communication unit receives the hearing aid processing When the information
indicates that it is not required, the voice signal input to the signal processing device is
transmitted to the second communication unit, and the received information is information
indicating that a hearing aid process is required. The audio signal subjected to the hearing aid
processing by the hearing aid processing unit may be transmitted to the second communication
unit. In this way, the designating unit designates whether or not the hearing aid processing is
required. Therefore, when the hearing aid is required, the signal subjected to the hearing aid
processing is compressed and encoded to a high quality, and when the hearing aid is not
11-04-2019
7
required, the original signal A broadband signal is reproduced.
[0024]
Further, at least one of the high-frequency attenuation filter and the hearing aid processing unit
may stop the operation when the information received by the first communication unit is
information indicating that the hearing aid processing is not required. . Thereby, when the
hearing aid is not required, at least one of the high-pass attenuation filter and the hearing aid
processing unit stops the operation, and the power consumption amount related to the process
or the calculation resource required for the process is reduced.
[0025]
Furthermore, a second communication unit that receives a signal from the first communication
unit, a decoding unit that decodes the signal received by the second communication unit into an
audio signal, and an audio that is decoded by the decoding unit A speaker for reproducing a
signal, the second communication unit, the decoding unit, and the speaker are integrated, and at
least the high-frequency attenuation filter, the hearing aid processing unit, the compression
encoding unit, And independent from the main device including the first communication unit, the
first communication unit further includes a reception function, and the second communication
unit transmits and receives signals to and from the first communication unit, The signal
processing apparatus further includes a designation unit that designates whether or not hearing
aid processing is required, and the second communication unit transmits the information
designated by the designation unit to the first communication unit, and the first communication
unit The communication unit does not require hearing aid processing for the received
information And the audio signal input to the signal processing apparatus is transmitted to the
second communication unit, and the received information indicates that the information needs to
be processed by the hearing aid, the hearing aid The processing unit transmits the audio signal
subjected to the hearing aid processing to the second communication unit, and the hearing aid
processing unit is information indicating that the information received by the first
communication unit does not require the hearing aid processing. In this case, the operation may
be stopped. Thereby, when the hearing aid is not required, the hearing aid processing unit stops
the operation, and the power consumption amount related to the processing or the calculation
resource required for the processing is reduced.
[0026]
11-04-2019
8
The predetermined frequency may be 8 kHz to 12 kHz. As a result, after securing the main
frequency band of television sound, the wideband sound signal is subjected to hearing aid
processing.
[0027]
Further, in order to solve the above problems, a signal processing method according to an aspect
of the present invention is a high-frequency attenuation step of attenuating a signal component
of a frequency band higher than at least a predetermined frequency of an input audio signal; And
a hearing aid processing step for performing hearing aid processing on the audio signal
processed in the high-frequency attenuation step, wherein the predetermined frequency is
determined according to the upper limit of the frequency band to be subjected to hearing aid.
Thus, hearing aid processing can be performed on the audio signal output from the highfrequency attenuation filter that attenuates the signal component of the high frequency band of
the wideband audio signal. Therefore, it is possible to perform high-accuracy hearing aid
processing of wide-band audio signals of a television or an optical disk.
[0028]
Further, in order to solve the above problems, in a signal processing method according to an
aspect of the present invention, a hearing aid processing step of performing hearing aid
processing on an input audio signal, and a compression encoding unit And a first communication
step of transmitting the signal compression-encoded in the compression encoding step, wherein
the hearing aid processing step includes the hearing aid processing step The upper limit
frequency of the target frequency band is transmitted to the compression encoding unit, and in
the compression encoding step, the compression encoding unit performs hearing aid hearing
based on the frequency transmitted from the hearing aid processing unit. The signal component
of the target frequency band is assigned a larger number of coding bits than the other frequency
bands for compression coding. As a result, by attenuating the signal component of the high
frequency band with the high-pass attenuation filter, instead of automatically assigning a large
number of coding bits to the signal component of the frequency band for which the hearing aid
processing has been performed, The upper limit frequency of the frequency band is transmitted
to the compression coding unit, and the frequency band to which the number of coding bits is to
be assigned is designated. Therefore, even without providing the high-pass attenuation filter, the
signal subjected to the hearing aid processing can be compressed and encoded with high sound
11-04-2019
9
quality.
[0029]
According to the signal processing apparatus and the signal processing method of the present
invention, high-accuracy hearing aid processing can be performed on a wideband audio signal of
a television or an optical disk, and the signal subjected to the hearing aid processing can be
compressed and encoded with high sound quality.
[0030]
FIG. 1 is a diagram showing the configuration of a signal processing apparatus according to the
embodiment.
FIG. 2 is a diagram showing an example of the frequency characteristic of the output signal of the
speech decoder. FIG. 3 is a diagram showing an example of the frequency characteristic of the
output signal of the high-pass attenuation filter. FIG. 4 is a diagram showing an example of the
frequency characteristic of the output signal of the hearing aid processor. FIG. 5 is a diagram
showing a frequency band to which a bit is assigned in the compression coding unit. FIG. 6 is a
diagram showing the configuration of a signal processing device that does not have a high-pass
attenuation filter. FIG. 7 is a diagram for explaining the basic operation of the hearing aid
processing. FIG. 8 is a diagram for explaining a frequency band to be a target of hearing aid for a
wide band signal. FIG. 9 is a diagram showing an example of frequency components that interfere
with hearing aid processing. FIG. 10 is a diagram for explaining a frequency band which is a
target of bit allocation in compression coding for a wideband signal.
[0031]
Hereinafter, a signal processing device and a signal processing method according to an aspect of
the present invention will be specifically described with reference to the drawings.
[0032]
Each embodiment described below shows one specific example of the present invention.
11-04-2019
10
The numerical values, the components, the arrangement positions and connection forms of the
components, the processing order, and the like shown in the following embodiments are merely
examples, and are not intended to limit the present invention. Further, among the components in
the following embodiments, components not described in the independent claim indicating the
highest level concept will be described as an optional component.
[0033]
FIG. 1 is a diagram showing the configuration of a signal processing device 1 in the present
embodiment.
[0034]
In FIG. 1, a signal processing apparatus 1 according to the present embodiment is an apparatus
that can perform hearing aid processing on a wideband speech signal with high accuracy, and
can compress and encode the signal subjected to the hearing aid processing with high sound
quality.
In addition, it is an apparatus that allows listeners who require such a hearing aid process and
listeners who do not need to enjoy the content at the same time. The signal processing device 1
includes a main device 2 and a portable device 3.
[0035]
The main device 2 is, for example, a television set, and includes an audio decoder 10, a high
frequency attenuation filter 11, a hearing aid processing unit 12, a switch 13, a compression
encoding unit 14, and a first communication unit 15.
[0036]
The portable device 3 is a portable casing (for example, a portable speaker) independent of the
main device 2, and includes a second communication unit 16, a decoding unit 17, a speaker 18,
and a designation unit 19.
[0037]
11-04-2019
11
The voice decoder 10 is a circuit that converts an input voice coded signal into a PCM (Pulse
Code Modulation) signal.
The audio encoded signal input here is an audio encoded signal such as an audio encoded signal
of television broadcast, an audio encoded signal of content of DVD or BD, or an AV (Audio Visual)
content distributed via the Internet. It is a signal.
These speech encoded signals are encoded signals of a wideband speech signal whose sampling
frequency is 32 kHz or more (reproduction band is 16 kHz or more). In general, digital television
broadcasting has a sampling frequency of 48 kHz (reproduction band is 24 kHz), and DVD / BD
content has sampling frequencies of 48 kHz / 96 kHz / 192 kHz (reproduction bands of 24 kHz /
48 kHz / 96 kHz, respectively). The main input signal of the present invention is a signal having
such a frequency band.
[0038]
The high-pass attenuation filter 11 is a circuit that attenuates a signal component of a frequency
band higher than at least a predetermined frequency (cutoff frequency) of the input wide-band
speech signal. The predetermined frequency is determined in accordance with the upper limit of
the frequency band to be subjected to hearing aid.
[0039]
The hearing aid processing unit 12 is a circuit that performs hearing aid processing on the audio
signal output from the high-frequency attenuation filter 11. That is, as shown in FIG. 7, by
amplifying a small amplitude signal and maintaining a large amplitude signal, the dynamic range
of the perception of sound is reduced (that is, a large sound is normal). Complement the human
ear's hearing)
[0040]
The switch 13 is a circuit that sends one of the two input signals to the subsequent stage.
[0041]
11-04-2019
12
The compression encoding unit 14 is a circuit that compresses and encodes the signal subjected
to the hearing aid processing by the hearing aid processing unit 12.
The compression encoding scheme employs a type of compression encoding scheme in which
bits are adaptively assigned to signals in the frequency domain, such as the SBC scheme or the
AAC scheme compliant with the Bluetooth (registered trademark) standard.
[0042]
The first communication unit 15 has a reception function of transmitting a signal compressed
and encoded by the compression encoding unit 14 and receiving a signal from a second
communication unit 16 described later, for example, Bluetooth (registered trademark) It is a
communication interface that transmits and receives radio waves compliant with the standard.
[0043]
The above is the elements incorporated into the device on the main body side ("main device 2",
for example, a television set).
[0044]
The second communication unit 16 is a communication interface that transmits and receives
signals to and from the first communication unit 15, and transmits and receives, for example,
wireless radio waves compliant with the Bluetooth (registered trademark) standard.
[0045]
The decoding unit 17 is a circuit that decodes the signal received by the second communication
unit 16 into an audio signal.
The decoding method is a decoding method corresponding to the compression encoding method
used by the compression encoding unit 14.
[0046]
11-04-2019
13
The speaker 18 is a speaker that converts the audio signal decoded by the decoding unit 17 into
an acoustic signal and reproduces it.
[0047]
The designation unit 19 is a circuit that designates whether a hearing aid process is required.
[0048]
As described above, the second communication unit 16 to the designation unit 19 are elements
integrated and incorporated in a housing (“portable device 3”, for example, a portable speaker)
independent of the main device 2 (for example, a television set).
[0049]
The operation of the signal processing device 1 of the present embodiment configured as
described above will be described below.
[0050]
First, the speech decoder 10 converts the inputted speech coding signal into a PCM signal.
The decoding method in the speech decoder 10 conforms to the coding standard of each of the
inputted speech coding signals.
[0051]
FIG. 2 is a diagram showing an example of the frequency characteristic of the output signal of the
audio decoder 10. As shown in FIG.
As shown in FIG. 2, in the present embodiment, the reproduction band of the reproduced signal is
a 24 kHz wide band signal.
[0052]
11-04-2019
14
Next, the high-pass attenuation filter 11 attenuates the signal component of the frequency higher
than the frequency band handled by the hearing aid processing unit 12 among the signal
components of the input wide band audio signal.
For this purpose, the high-pass attenuation filter 11 is notified from the hearing aid processing
unit 12 as to which frequency band signal component is to be listened to.
That is, the cutoff frequency of the high-pass attenuation filter 11 is determined in accordance
with the upper limit of the frequency band to be subjected to hearing aid.
In FIG. 1, the dotted line from the hearing aid processing unit 12 to the high-frequency
attenuation filter 11 represents the notification of the upper limit of the frequency band to be
subjected to hearing aid.
When the hearing aid processing unit 12 performs the hearing aid processing only by a
predetermined method, the high-frequency attenuation filter 11 does not receive a notification of
the upper limit of the frequency band to be a target of hearing aid from the hearing aid
processing unit 12. Good. That is, the cut-off frequency of the high-frequency attenuation filter
11 may be set in advance according to a predetermined frequency band handled by the hearing
aid processing unit 12. Therefore, in this case, since the cutoff frequency of the high-pass
attenuation filter 11 is set in advance, the dotted line from the hearing aid processing unit 12 to
the high-pass attenuation filter 11 is unnecessary in FIG.
[0053]
FIG. 3 is a diagram showing an example of the frequency characteristic of the output signal of the
high-pass attenuation filter 11.
[0054]
In the present embodiment, the upper limit of the frequency band targeted for hearing aid in the
hearing aid processor 12 is 8 kHz.
11-04-2019
15
The frequency characteristic shown in FIG. 3 is obtained by attenuating the signal component of
the frequency band of 8 kHz or more, which is determined according to the upper limit of the
frequency band targeted for hearing aid from the signal of the frequency characteristic shown in
FIG. There is. However, in general, a filter that attenuates signal components in a specific
frequency band does not have completely steep characteristics. Therefore, also in the high-pass
attenuation filter 11 of the present embodiment, signal components in the frequency band of 8
kHz or more remain, and further, signal components in the frequency band of 8 kHz or less are
also attenuated to some extent.
[0055]
Next, the hearing aid processing unit 12 performs hearing aid processing on the audio signal
output from the high-frequency attenuation filter 11. The method may be any method known in
the art, but the basic operation amplifies the small amplitude signal and the large amplitude
signal maintains its amplitude as shown in FIG. 7 described above. It is an operation of doing.
Here, even if a signal component with a large amplitude exists in a frequency band higher than
the frequency band targeted for hearing aid in the output signal of the audio decoder 10, the
effect of the high-pass attenuation filter 11 is Signal components with large amplitudes are
attenuated and do not interfere with the hearing aid process. That is, even in the state shown in
(a) and (b) of FIG. 9 described above, the signal component is attenuated and therefore not
treated as a signal with a large amplitude. It does not disturb.
[0056]
FIG. 4 is a diagram showing an example of the frequency characteristic of the output signal of the
hearing aid processing unit 12.
[0057]
Usually, hearing aid processing is performed on signal components in a frequency band of about
10 kHz or less.
However, since there is individual difference in the optimum frequency band in which the
hearing aid processing is performed, the frequency band in which the hearing aid processing is
performed may be about 8 kHz or less or about 12 kHz or less. The upper limit value of the
11-04-2019
16
frequency band is notified to the high-pass attenuation filter 11 and is reflected in the
characteristics of the high-pass attenuation filter 11. In the present embodiment, the frequency
band handled by the hearing aid processor 12 is 8 kHz or less. Therefore, as shown in FIG. 3, the
high-pass attenuation filter 11 attenuates signal components in a frequency band higher than the
notified frequency (here, 8 kHz). Thus, the hearing aid processing unit 12 outputs a signal having
the frequency characteristic shown in FIG. 4 from the hearing aid processing unit 12 as the
hearing aid processing unit 12 performs hearing aid processing on the signal in which the signal
component in the frequency band higher than 8 kHz is attenuated.
[0058]
Next, the switch 13 sends one of the output signal from the hearing aid processing unit 12 and
the output signal from the audio decoder 10 to the compression encoding unit 14 in the
subsequent stage. In the following, first, an operation in the case where an output signal from the
hearing aid processing unit 12 is sent to the compression coding unit 14 by the selection
operation of the switch 13 will be described.
[0059]
Next, the compression encoding unit 14 compresses and encodes the signal sent from the switch
13 and subjected to the hearing aid processing by the hearing aid processing unit 12.
[0060]
FIG. 5 is a diagram showing a frequency band to which a bit is assigned by the compression
coding unit 14.
[0061]
In the present embodiment, the frequency band handled by the hearing aid processor 12 is 8 kHz
or less, and the high frequency attenuation filter 11 attenuates the signal of 8 kHz or more,
reflecting that.
As shown in FIG. 5, since the compression encoding unit 14 has almost no high frequency
component of 8 kHz or more, the frequency component of the frequency band of 8 kHz or lower
to be automatically targeted for hearing aid has another frequency. There are more bit
11-04-2019
17
allocations than bandwidth.
That is, the high-pass attenuation filter 11 also functions to induce the compression encoding
unit 14 to assign many bits to the signal component of the frequency band subjected to the
hearing aid processing.
[0062]
The compression encoding unit 14 may directly obtain information on the frequency band
handled by the hearing aid processing unit 12. In this case, in FIG. 1, the information of the
frequency band handled by the hearing aid processing unit 12 is transmitted along the dotted
path from the hearing aid processing unit 12 to the compression encoding unit 14.
[0063]
Next, the first communication unit 15 transmits the signal compression-encoded by the
compression encoding unit 14 to the second communication unit 16.
[0064]
The above is the operation of the elements incorporated into the main device 2 (for example, the
television set).
[0065]
Next, the operation of the portable device 3 configured independently of the main device 2 will
be described.
The portable device 3 is a portable device (for example, a portable speaker), and is assumed to be
placed at the knee of an elderly person, on the desk of the elderly person, or the like.
[0066]
First, the second communication unit 16 receives the transmission signal from the first
communication unit 15.
11-04-2019
18
[0067]
Next, the decoding unit 17 decodes the signal received by the second communication unit 16
into an audio signal using a decoding method corresponding to the compression encoding
method used in the compression encoding unit 14 and generates an audio signal. Generate
[0068]
Next, the speaker 18 converts the audio signal decoded by the decoding unit 17 into an acoustic
signal and reproduces it.
[0069]
Here, although not shown in FIG. 1, a speaker is also attached to the main device 2 (for example,
a speaker incorporated in a television set).
A speaker attached to the main device 2 reproduces an output signal from the audio decoder 10
as an acoustic signal.
On the other hand, the speaker 18 reproduces the acoustic signal subjected to hearing aid
processing in the vicinity of the elderly person.
Therefore, the elderly person listens to the sound signal from the speaker 18 of the portable
device 3 and the healthy person listens to the sound signal from the speaker of the main device 2
so that the elderly person and the healthy person enjoy the appropriate audio signal respectively.
Can do.
[0070]
Finally, the role of the designation unit 19 will be described.
[0071]
11-04-2019
19
The designation unit 19 designates whether a hearing aid process is required.
The information designated by the designation unit 19 is sent to the second communication unit
16 and further transmitted from the second communication unit 16 to the first communication
unit 15.
The first communication unit 15 sends the information designated by the designation unit 19 to
the switch 13. When the information received by the first communication unit 15 indicates that
the information required for the first communication unit 15 needs the hearing aid processing,
the switch 13 compresses and encodes the narrowband audio signal to which the hearing aid
processing unit 12 performs the hearing aid processing. The unit 14 performs compression
coding and sends it to the first communication unit 15. In addition, when the information
received by the first communication unit 15 indicates that the information received by the first
communication unit 15 does not require hearing aid processing, the switch 13 receives the
wideband audio signal input to the signal processing device 1 and decoded by the audio decoder
10. The compression encoder 14 compresses and encodes the data and sends it to the first
communication unit 15. Furthermore, for example, the portable device 3 includes a switch that
can be switched ON / OFF whether or not a hearing aid process is required although not shown
in FIG. That is, the elderly person who needs the hearing aid process turns on the switch
provided in the portable device 3. In addition, a healthy person who does not need the hearing
aid process turns off the switch provided in the portable device 3. By doing so, the listener who
listens to the acoustic signal reproduced by the portable device 3 can turn on / off the hearing
aid processing at hand. Furthermore, in the case of OFF, a signal not passing through the highfrequency attenuation filter 11 is extracted from the main device 2 and reproduced from the
speaker 18, so that a healthy person can enjoy a wide band audio signal with the portable device
3.
[0072]
Furthermore, when the information received by the first communication unit 15 is information
indicating that the hearing aid processing is not required, at least one of the high-pass
attenuation filter 11 and the hearing aid processing unit 12 stops operating, and power
consumption is consumed. Reduce the amount or reduce the use of computing resources.
[0073]
As described above, according to the signal processing device 1 in the present embodiment, the
signal component of the high frequency band of the wide band audio signal is attenuated by the
high-pass attenuation filter 11 and then the hearing aid processing unit 12 performs the hearing
11-04-2019
20
aid processing. Also, since the signal component of the frequency band to be a target of hearing
aid is compression-coded by the compression coding unit 14 being assigned a larger number of
coding bits than in other frequency bands, from a television or an optical disk player Hearing aid
processing can be performed with high accuracy on the output wide band audio signal, and the
signal subjected to the hearing aid processing can be compressed and encoded with high sound
quality.
[0074]
Also, the listener requiring hearing aid listens to the acoustic signal that has been subjected to
hearing aid processing from the speaker 18 of the portable device 3 carried near the listener
requiring hearing aid, and the listener not requiring hearing aid uses the main device 2 By
listening to a normal sound signal from a speaker attached to the speaker, listeners who need
hearing aid and listeners who do not need hearing aid can simultaneously enjoy the same
content.
[0075]
As mentioned above, although the signal processing apparatus 1 which concerns on this
invention was demonstrated based on embodiment, this invention is not limited to this
embodiment.
What did various modification which those skilled in the art think about is given to an
embodiment unless it deviates from the meaning of the present invention may be included in the
scope of the present invention.
[0076]
For example, although the signal processing device 1 in the above embodiment includes the highpass attenuation filter 11, the high-pass attenuation filter 11 need not necessarily be provided.
[0077]
FIG. 6 is a diagram showing a configuration of a signal processing device according to a
modification of the present embodiment, that is, a signal processing device 1a not provided with
the high-frequency attenuation filter 11.
11-04-2019
21
The signal processing device 1a is a device that can perform hearing aid processing on a
wideband speech signal with high accuracy, and can compress and encode the signal subjected to
the hearing aid processing with high sound quality.
In addition, it is an apparatus that allows listeners who require such a hearing aid process and
listeners who do not need to enjoy the content at the same time.
The signal processing device 1a of FIG. 6 differs from the signal processing device 1 shown in
FIG. 1 in that the main device 2a is provided instead of the main device 2. In FIG. 6, the same
components as those shown in FIG. 1 are denoted by the same reference numerals, and the
description thereof will be omitted.
[0078]
The main device 2 a is, for example, a television set, and includes an audio decoder 10, a hearing
aid processor 12, a switch 13, a compression encoder 14, and a first communication unit 15.
[0079]
The signal processing device 1a includes a main device 2a obtained by removing the highfrequency attenuation filter 11 from the main device 2 of the component included in the signal
processing device 1 shown in FIG.
Also in such a signal processing apparatus, the hearing aid processing unit 12 transmits the
upper limit frequency of the frequency band to be a target of hearing aid to the compression
encoding unit 14 to specify the frequency band to which the number of encoding bits is
allocated. . Therefore, even if the high-pass attenuation filter 11 is not provided, the signal
subjected to the hearing aid processing is compressed and encoded with high sound quality.
[0080]
Further, the present invention can be realized not only as the signal processing device in the
11-04-2019
22
above-described embodiment but also as a signal processing method. The signal processing
method includes a high-pass attenuation step for attenuating a signal component of a frequency
band higher than at least a predetermined frequency of the input audio signal, and a hearing aid
processing step for performing hearing aid processing on the audio signal processed in the highpass attenuation step. And the predetermined frequency is a signal processing method
determined according to the upper limit of the frequency band targeted for hearing aid. Here, the
hearing aid processing step for performing hearing aid processing on the input audio signal; and
the compression encoding step for compressing and encoding the signal subjected to the hearing
aid processing in the hearing aid processing step. And a first communication step of transmitting
a signal compressed and encoded in the compression encoding step, and in the hearing aid
processing step, the hearing aid processing unit 12 compresses and encodes the upper limit
frequency of the frequency band to be a target of hearing aid. In the compression encoding step,
based on the frequency transmitted from the hearing aid processing unit 12, the compression
encoding unit 14 transmits to the signal component of the frequency band to be a target for
hearing aid in another frequency band. It may be a signal processing method in which a larger
number of coding bits is allocated and compression coding is performed. Even with such a signal
processing method, the signal component in the high frequency band of the wide-band speech
signal is attenuated by the high-pass attenuation filter 11, and then the hearing aid processing
unit 12 performs the hearing aid processing, and The compression encoding unit 14 assigns a
larger number of encoding bits than that of other frequency bands and compresses and encodes
the signal component of one frequency band, so high-accuracy hearing aid processing of a
wideband audio signal of a television or optical disk is performed. It is possible to perform
compression and coding with high sound quality on a signal that has been processed and
deafened.
[0081]
Also, such a signal processing method may be realized as a program executed by a processor
such as a DSP (Digital Signal Processor). It goes without saying that such a program can be
stored in a computer readable recording medium such as a DVD.
[0082]
Further, in the present embodiment, the frequency band handled by the hearing aid processor 12
is 8 kHz or less, but not limited to this, it may be 12 kHz or less. As a result, the cutoff frequency
of the high-pass attenuation filter 11 is determined according to the upper limit of the frequency
band targeted for hearing aid, and the cutoff frequency of the high-pass attenuation filter 11 may
11-04-2019
23
be 8 kHz to 12 kHz.
[0083]
Further, in the present embodiment, in order to simplify the explanation, a listener requiring
hearing aid processing is an elderly person, and a listener not requiring hearing aid processing is
a healthy person. However, it goes without saying that elderly people do not necessarily require
hearing aid processing, and conversely some listeners need hearing aid processing even if they
are not elderly.
[0084]
The signal processing apparatus according to the present invention can be widely applied to
digital AV equipment.
[0085]
1, 1a Signal processing device 2, 2a Main body device 3 Portable device 10 Voice decoder 11
High frequency attenuation filter 12 Hearing aid processing unit 13 Switch 14 Compression
coding unit 15 First communication unit 16 Second communication unit 17 Decoding unit 18
Speaker 19 Designated section
11-04-2019
24
Документ
Категория
Без категории
Просмотров
0
Размер файла
36 Кб
Теги
description, jpwo2016013161
1/--страниц
Пожаловаться на содержимое документа