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JP2007274423

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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
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DESCRIPTION JP2007274423
The present invention provides a voice generation device capable of preventing the influence of
high frequency noise as much as possible even when the priority frequency band used in the
language used by the user is high. An audio processing IC of an in-vehicle radio receiver sets an
attenuation amount by high cut control according to a language when a language used is selected
by a user. In other words, since the English people have a high priority frequency band
(frequency band to be used preferentially) and a high frequency listening ability, the British listen
to the voice from the speaker when the high frequency noise is superimposed on the voice signal.
It becomes difficult. Therefore, by setting the amount of attenuation in the high frequency band
to attenuate high frequency noise, even a British person with high ability to listen to high
frequencies can clearly hear the sound from the speaker without feeling discomfort. be able to.
[Selected figure] Figure 5
Voice generator
[0001]
The present invention relates to a voice generator provided with a function to attenuate high
frequency components above a predetermined frequency.
[0002]
There is a thing of patent documents 1 as this kind of device.
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This object is intended to reduce audible noise by implementing high cut control and stereo
separation control according to the electric field strength of the detected receiving station in the
in-vehicle FM radio tuner. In general, the high cut control is generally set by tuning as a constant
for, for example, for Europe, for North America, for Japan, etc. for each destination based on the
evaluation of the on-vehicle radio vehicle, and setting for each destination of the vehicle.
Unexamined-Japanese-Patent No. 11-298426
[0003]
By the way, it has become known by French scholar Dr. Alfred Tomatis that the human hearing is
influenced by the culture and living environment, and in particular, is very easily influenced by
the language used by that person. It is known that the language has a priority frequency band
which is preferentially used when speaking a language.
[0004]
However, since the priority frequency band used preferentially for each language affects the way
the audible noise is heard, it may be difficult for the user to listen to the audio from the in-vehicle
radio only by tuning for each in-vehicle radio destination. .
For example, when the electric field intensity received by the in-vehicle radio is weak, the invehicle radio is likely to generate very annoying high frequency noise. For this reason, if the
priority frequency band preferentially used in the user's language is high frequency, the user
feels uncomfortable with the offensive high frequency noise emitted from the in-vehicle radio,
and the original voice emitted from the in-vehicle radio is It becomes difficult to hear.
[0005]
The present invention has been made in view of the above circumstances, and an object thereof
is to provide a voice generating device capable of preventing the influence of high frequency
noise as much as possible even when the priority frequency band used in the language used by
the user is high. It is to provide.
[0006]
According to the invention of claim 1, the voice extraction means extracts the voice signal from
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the input signal, and the voice generation means generates the voice signal extracted by the voice
extraction means as voice.
Here, when the user selects his / her own language (native language) by the language selection
means, the attenuation means determines a predetermined one of the frequency bands of the
speech signal extracted by the speech extraction means according to the language selected by
the selection means. Attenuates high frequency components. As a result, since the offensive high
frequency noise emitted from the voice generation means can be attenuated, it is possible to
prevent the user from feeling unpleasant even if the user is excellent in the ability to listen to the
high frequency sound. Can.
[0007]
According to the invention of claim 2, the higher the priority frequency band to be used
preferentially, the higher the high frequency component is attenuated, so that high frequency
noise which may be annoying depending on the language used can be effectively attenuated. .
[0008]
According to the third aspect of the invention, when the voice extraction means has the high cut
control function, it can be easily implemented by using the high cut control function as the
attenuation means.
[0009]
According to the invention of claim 4, it can be easily implemented using an audio processing IC.
According to the invention of claim 5, when extracting the audio signal included in the received
signal from the tuner module, when the electric field intensity received by the tuner module is
weak, high frequency noise is attenuated by attenuating the high region. Although attenuation
can be performed, high frequency noise is not generated when the electric field strength is high,
so that it is possible to prevent the high frequency component from being attenuated
unnecessarily.
[0010]
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Hereinafter, an embodiment in which the present invention is applied to a car radio receiver will
be described with reference to the drawings.
FIG. 1 is a block diagram showing an on-vehicle radio receiver. As shown in FIG. 1, the on-vehicle
radio receiver 1 includes a tuner module (corresponding to a radio tuner) 2, an audio processing
IC (corresponding to an audio extraction unit and an attenuation unit) 3, an amplifier 4 and a
speaker (corresponding to an audio generation unit). ) Is composed of five.
[0011]
The tuner module 2 converts an RF (Radio Frequency) signal received by the antenna 6 into an IF
(Intermediate Frequency) signal and outputs it. The tuner module 2 includes an FM-IF unit 7 that
converts an FM (Frequency Modulation) signal into an IF signal, an AM-IF unit 8 that converts an
AM (Amplitude Modulation) signal into an IF signal, and a signal meter Equivalent to notification
means) 9). The signal meter 9 indicates a DC voltage indicating the electric field strength of the
RF signal received by the antenna 6, and the DC voltage is supplied to the audio processing IC 3.
[0012]
The audio processing IC 3 includes a tuner and audio DSP (Digital Signal Processor) which is a
microprocessor specialized for voice processing, and an IF-ADC (Analog Digital Converter) 10, a
detection unit 11, a stereo demodulation unit 12, and a characteristic adjustment unit 13, DAC
(Digital Analog Converter) 14 is comprised. The IF-ADC 10 AD-converts the IF signal
(corresponding to the input signal) input from the tuner module 2 and then converts the sample
rate into a value suitable for processing in the circuit in the subsequent stage. The detection unit
11 performs predetermined radio signal processing on the digital signal digitally converted by
the IF-ADC 10 to extract a radio signal (corresponding to an audio signal) included in the digital
signal. The radio signal processing applied at this time is AM / FM noise removal, AM / FM
detection, etc. When the extracted radio signal is an FM radio signal, the stereo demodulation
unit 12 separates the radio signal into an L audio signal and an R audio signal. In this case, when
the input radio signal is an AM radio signal or monaural reception is selected, the input signal is
output as left and right signals without separation.
[0013]
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The characteristic adjustment unit 13 has functions of SSC (Stereo Separation Control) and HCC
(High Cut Control). The SSC changes the blend ratio between the L audio signal and the R audio
signal in order to improve the S / N in stereo according to the DC voltage (indicating the received
electric field strength) from the signal meter 9. The HCC attenuates high-frequency components
when the DC voltage from the signal meter 9 is low, that is, when the electric field or multipath is
low. The operation of this HCC is executed as a low pass filter, for example, by calculation
processing of an FIR (Finite Impulse Response) digital filter, and the cutoff frequency can be
changed by changing the filter coefficient.
[0014]
The DAC 13 converts the input digital radio signal into an analog radio signal and outputs the
analog radio signal to the amplifier 4. The amplifier 4 amplifies the input analog radio signal and
generates sound from the speaker 5.
[0015]
The digital processing performed by the function of the tuner / audio DSP in the audio
processing IC 3 is performed by the program processing of the tuner / audio DSP.
[0016]
Next, the operation of the above configuration will be described.
FIG. 2 is a flowchart showing an outline of the operation of the audio processing IC 3 related to
the present invention. In FIG. 2, when the audio processing IC 3 is operated by turning on the
power, first, after executing a predetermined initialization process (S 1), the DC voltage from the
signal meter 9, that is, the reception level of the tuner module 2 Is determined to be equal to or
less than a predetermined level (S2). If the reception level exceeds the predetermined level (S2:
NO), it is determined that high frequency noise is not generated, the normal HCC attenuation
amount is set (S7), and HCC is executed (S5), SSC And other audio processing is executed (S6). In
this case, the amount of attenuation of normal HCC is a constant set corresponding to the
destination of the vehicle as described in the conventional example. Therefore, the speaker 5
emits radio sound to which normal HCC has been applied.
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[0017]
If the reception level of the tuner module 2 is below the predetermined level (S2: YES), it is
judged that high frequency noise is generated, and it is judged whether the language is selected
(S3). When the language is not selected (S3: NO), the attenuation amount of normal HCC is set
(S7), and after HCC is executed (S5), other audio processing such as SSC is executed (S6) .
[0018]
Now, when the user uses the in-vehicle radio receiver for the first time, or changes the selected
language, the user selects a language (native language). To select a language, a language
selection screen is displayed on, for example, a multi-information display (not shown) provided
on an instrument panel of a vehicle.
[0019]
FIG. 3 shows an example of the language selection screen displayed on the multi-information
display. As shown in FIG. 3, the language selection screen 15 displays a language list 16
indicating languages that can be selected, and is displayed above the language list 16 at the top
of the language list 16. The language is displayed as the selected language 17. A side of the
language list 16 displays an index unit 18 indicating the position of the currently displayed
language in the entire language, and also displays a list up button 19 and a list down button 20,
and a return button 21. It is displayed. Therefore, the user selects a language by a touch
operation on the list up button 19 and the list down button 20, and performs touch operation on
the return button 21 when the language selection is completed.
[0020]
The multi-information display is configured to have a touch operation unit (corresponding to a
language selection unit) 22 as shown in FIG. 1, and the language selected by the touch operation
on the touch operation unit 22 is instructed to the audio processing IC 3 Be done. As described
above, the user can select the language (native language) he / she uses by operating the multi-
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information display.
[0021]
When the language is selected by the user as described above, the audio processing IC 3 sets the
attenuation amount of HCC as shown in FIG. 2 based on the priority frequency band
preferentially used in each language ( S4).
[0022]
FIG. 4 shows an example of the preferred frequency band of each language.
As shown in FIG. 4, it can be seen that while the priority frequency band is high in English, the
priority frequency band is low in Japanese. This means that the British are excellent in the ability
to listen to high frequency sound, and when high frequency noise is emitted from the speaker 5,
the user feels uncomfortable and the radio voice becomes difficult to hear . On the other hand,
Japanese means that the ability to listen to high frequency sound is inferior, and even if high
frequency noise is emitted from the speaker 5, it does not feel so unpleasant and radio voice You
can listen to
[0023]
Therefore, when the user selects English (UK) on the language selection screen shown in FIG. 3,
the user has a high ability to listen to the sound of high frequency, so the FIR digital filter
coefficient is increased so that the attenuation of the high region becomes large. Are set (the
attenuation amount C shown in FIG. 5). On the other hand, when the user selects Japanese, the
ability to hear high-frequency sounds is low, so the FIR digital filter coefficients are set so that
the amount of attenuation in the high region decreases (the amount of attenuation A shown in
FIG. 5). Do. That is, since the British feel discomfort when the high frequency noise is generated
from the speaker 5, the attenuation amount of the high frequency component is set large even if
the high frequency characteristic is deteriorated. On the other hand, since Japanese people do
not feel discomfort even if high frequency noise is generated from the speaker 5, the attenuation
amount of the high frequency component is set small so that the high frequency characteristic is
not deteriorated. It is
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[0024]
The frequency band shown by the hatched area in FIG. 4 indicates the dominant frequency band
recognized as speech, and it is needless to say that it can be recognized as speech even in
frequency bands other than the hatched area. Further, the priority frequency band shown in FIG.
4 only shows representative numerical values, and even users in the same country have a
difference in listening ability depending on the user.
[0025]
Returning to FIG. 2, the audio processing IC 3 which sets the attenuation amount of HCC as
described above executes HCC (S5) and executes other audio control such as SSC (S5), step S2
The above operation is repeated by returning to.
[0026]
As described above, as a result of the predetermined radio signal processing being performed on
the RF signal input from the tuner module 2, a radio from which high frequency components of a
predetermined frequency or more are attenuated from the speaker 5 according to the selected
language Sound is emitted.
Therefore, since the high frequency noise included in the radio signal can be attenuated by the
audio processing IC 3, even if the user is a British who is excellent in the high frequency listening
ability, the speaker 5 emits it without feeling discomfort due to the high frequency noise Can
hear clear voices.
[0027]
According to such an embodiment, the audio processing IC 3 attenuates high frequency
components above the predetermined frequency in the frequency band of the audio signal
according to the language selected by the user. Even if the priority frequency band is high, by
attenuating high frequency noise from the speaker 5, the user can listen to clear voice without
feeling uncomfortable.
[0028]
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Moreover, since the high cut control function of the audio processing IC 3 is used as means for
attenuating such high frequency components, it can be easily implemented without using any
special means.
In addition, the high frequency component of the radio signal is attenuated only when the DC
voltage from the signal meter 9 falls below the predetermined level, so the high frequency
characteristic is unnecessarily deteriorated in the state where high frequency noise is not
generated. Can be avoided as much as possible without degrading the sound quality.
[0029]
The present invention can be modified or expanded as follows without being limited to the above
embodiments. For example, the country in which the vehicle is traveling may be detected by GPS
(Global Positioning System), and the language of the country may be automatically selected. The
language used by the user may be automatically selected by analyzing the voice emitted by the
user. The cut frequency that the user wants to attenuate may be arbitrarily set. The high
frequency component of the audio signal may be attenuated by an analog circuit. The input
signal may be a signal from a television tuner, audio, or hands-free portable telephone other than
the radio tuner.
[0030]
A block diagram showing the operation of a radio receiver according to an embodiment of the
present invention. A flowchart showing an example of an audio processing IC. A diagram showing
an example of a language selection screen. A diagram showing a priority frequency band of each
language. A setting of attenuation of highcut control. Figure
Explanation of sign
[0031]
In the figure, 1 is an on-vehicle radio receiver, 2 is a tuner module (radio tuner), 3 is an audio
processing IC (audio extraction means, attenuation means), 4 is an amplifier, 5 is a speaker
(audio generation means), 9 is a signal meter (Notification means), 22 is a touch operation unit
(language selection means).
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