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JPH0954592

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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 JPH0954592
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
active noise eraser, and more particularly to a technique for listening to a target sound in a noisy
environment.
[0002]
2. Description of the Related Art Conventionally, in this type of audio listening technology, when
listening to a target sound from an audio device such as an audio device, the external noise is
physically blocked so that the external noise is not mixed in the target sound. There is a method
or a method of sampling extraneous noise before mixing into the target sound and eliminating it
by phase inversion or the like.
[0003]
In the case of the latter method, as shown in FIG. 3, the voice signal generated by the voice
synthesis circuit 11 based on the predetermined parameter is synthesized voice from the speaker
13 through the D / A (digital / analog) conversion circuit 12. It is output.
[0004]
The microphone 14 takes in the synthesized voice outputted from the speaker 13 together with
the ambient sound, and outputs the taken-in voice signal to the ambient sound extraction and
analysis circuit 16 via an A / D (analog / digital) conversion circuit 15.
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[0005]
The ambient sound extraction and analysis circuit 16 extracts only the ambient sound from the
audio signal captured by the microphone 14 based on the audio signal generated by the speech
synthesis circuit 11.
Here, the audio signal captured by the microphone 14 includes a synthesized audio component
and an ambient sound component.
[0006]
The ambient sound extraction and analysis circuit 16 analyzes the extracted ambient sound, and
generates a parameter adjusted so that the synthesized speech is a voice that is not easily
influenced by the ambient sound and is easy to hear, and passes it to the speech synthesis circuit
11.
The voice synthesis circuit 11 generates a voice signal based on the parameters from the ambient
sound extraction and analysis circuit 16.
This technique is described in detail in JP-A-5-307395.
[0007]
SUMMARY OF THE INVENTION In the above-described conventional speech synthesizer, the
adjustment of the parameters for the sound source generation unit, that is, the operation of the
sound source is performed. It is not suitable for the output of playback sound from a record etc.).
[0008]
In addition, since synthetic sound with little influence of ambient sound is generated by
parameter adjustment, ambient sound is not actively erased, so the level of ambient sound in, for
example, a machine shop or in a battle vehicle is extremely high. In high environments, sufficient
effects can not be obtained.
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[0009]
Furthermore, in the case of music appreciation or the like, the sound quality may change, or a
voice different from the original sound may be output.
Since the above-mentioned voice synthesizer operates the sound source, it is difficult to add the
above-mentioned technology to the existing equipment and use it.
[0010]
Therefore, the object of the present invention is to solve the above-mentioned problems, to be
able to easily hear the target sound even under high-level noise environment, to maintain the
sound quality of the sound source, and to add to existing equipment It is to provide an active
noise eraser that can.
[0011]
An active noise eraser according to the present invention comprises: capturing means for
capturing the ambient sound of a headphone; phase inverting means for inverting the phase of
the ambient sound captured by the capturing means; A first addition means for adding the
ambient sound whose phase is inverted by the phase inversion means and the target sound from
the sound source; and a second addition means for adding the target sound from the sound
source to the addition result of the first addition means An addition means and an output means
for outputting the addition result of the second addition means to the outside are provided.
[0012]
Another active noise eraser according to the present invention comprises a microphone for
collecting ambient sound of headphones, a phase inverting means for inverting the phase of the
ambient sound collected by the microphone, and a phase inverted by the phase inverting means.
First adding means for adding the ambient sound and the target sound from the sound source;
second adding means for adding the target sound from the sound source to the addition result of
the first adding means; And a speaker for outputting the addition result of the addition means to
the outside.
[0013]
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Another active noise eraser according to the present invention comprises: capturing means for
capturing an ambient sound of a headphone including a target sound from a sound source; phase
inverting means for inverting the phase of the ambient sound captured by the capturing means;
A first synthesis unit that synthesizes an ambient sound whose phase is inverted by the phase
inversion unit and a target sound from the sound source; and a second synthesis unit that
synthesizes the target sound from the sound source with the synthesized sound by the first
synthesis unit And output means for outputting the synthesized sound by the second synthesis
means to the outside.
[0014]
Still another active noise eraser according to the present invention comprises a microphone for
collecting ambient sound of headphones including a target sound from a sound source, phase
inverting means for inverting the phase of the ambient sound collected by the microphone, and A
first synthesis unit that synthesizes an ambient sound whose phase is inverted by the phase
inversion unit and a target sound from the sound source; and a second synthesis unit that
synthesizes the target sound from the sound source with the synthesized sound by the first
synthesis unit And a speaker for outputting the synthesized sound by the second synthesizing
means to the outside.
[0015]
DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the operation of the present invention
will be described below.
[0016]
The synthetic sound in the vicinity of the headphone including the target sound from the sound
source is collected by the microphone, the phase of the synthetic sound collected by the
microphone is inverted by the phase inverting circuit, and then added to the target sound from
the sound source by the adding circuit. Further, the audio signal is added to the target sound
from the sound source by an adder circuit and output from the speaker in the vicinity of the
outer ear.
As a result, the phase of the ambient sound near the headphones is inverted and then
superimposed on the target sound and output, so that only the target sound can be left.
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[0017]
Therefore, it is possible to hear only the target sound by causing the unnecessary ambient sound
to interfere with the ambient sound of the opposite phase and eliminating it, instead of
generating a synthetic voice of a sound quality that is easy to hear as in the conventional
example. The target sound can be easily heard even under a level noise environment, and the
sound quality of the sound source can be maintained.
[0018]
Also, without adjusting the sound quality with the parameters according to the conventional
ambient sound, the ambient sound (noise) other than the target sound is erased so that only the
target sound can be heard, and the parameter is returned to the sound source Interference is
unnecessary, so it can be added to existing equipment.
[0019]
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
In the figure, a headphone 2 according to an embodiment of the present invention includes a
microphone 21, an input volume 22, a phase inverting circuit 23, an adding circuit 24, a range
volume 25, an adding circuit 26, and an amplifier (AMP) 27; The speaker 28 is connected to the
sound source 1.
[0020]
FIG. 2 is a diagram showing the waveform of the audio signal in each block of the headphone 2
shown in FIG.
2 (a) shows the waveform of the ambient sound in the vicinity of the headphone 2 of FIG. 1, FIG.
2 (b) shows the waveform of the target sound from the sound source 1, and FIG. 2 (c) shows the
sound of the microphone 21 of FIG. The waveform of the synthetic sound a to be sounded is
shown.
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[0021]
2 (d) shows the waveform of the audio signal whose phase is inverted by the phase inverting
circuit 23 of FIG. 1, and FIG. 2 (e) shows the waveform of the audio signal synthesized by the
adding circuit 24 of FIG. .
FIG. 2 (f) shows the waveform of the synthetic sound b output from the speaker 28 of FIG. 1, and
FIG. 2 (g) shows the waveform of the synthetic sound d of FIG.
[0022]
The listening operation of the target sound under the noise environment according to one
embodiment of the present invention will be described using FIGS. 1 and 2.
[0023]
When the person who listens to the target sound from the sound source 1 wears the headphones
2 so as to cover the ears, the microphone 21 of the headphones 2 collects the synthetic sound a
in the vicinity of the outer ear.
Here, the synthetic sound a is a voice signal (surrounding of the ambient sound c near the outer
ear [see FIG. 2 (a)] and the target sound (original sound) [see FIG. 2 (b)] output from the speaker
28 Sound + target sound) [see FIG. 2 (c)].
[0024]
When the microphone 21 collects the synthesized sound a, the microphone 21 outputs the
synthesized sound a to the input volume 22.
The input volume 22 adjusts the level of the synthesized sound a so that the target sound
included in the synthesized sound a and the level of the original sound output from the sound
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source 1 become equal, and outputs the adjusted synthesized sound to the phase inversion
circuit 23 .
[0025]
The phase inversion circuit 23 inverts the phase of the synthesized sound from the input volume
22, and outputs the phase-inverted audio signal (-ambient sound-target sound) [see FIG.
[0026]
The adding circuit 24 adds the voice signal whose phase is inverted by the phase inverting circuit
23 and the original sound from the sound source 1 and combines them (-ambient sound-target
sound + target sound =-ambient sound) [Fig. 2 (e) Reference] is generated, and the generated
synthesized sound is output to the range volume 25.
The range volume 25 adjusts the synthesized sound generated by the addition circuit 24 to an
appropriate level.
[0027]
The addition circuit 26 adds the synthesized sound adjusted to an appropriate level by the range
volume 25 and the original sound from the sound source 1 to generate a synthesized sound (ambient sound + target sound) [see FIG. 2 (f)], The generated synthesized sound is output to the
speaker 28 via the amplifier 27.
[0028]
The speaker 28 outputs the synthesized sound amplified by the amplifier 27 near the outer ear.
At this time, the ambient sound c is added in the vicinity of the outer ear to the synthesized
sound b output from the speaker 28, and the synthesized sound d (-ambient sound + target
sound + ambient sound = target sound) [see FIG. 2 (g)] .
That is, the synthetic sound d is an audio signal in which the ambient sound c and the ambient
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sound of the opposite phase in the synthetic sound b cancel each other, and only the target
sound is obtained.
[0029]
As described above, the synthetic sound a in the vicinity of the headphone 2 including the target
sound from the sound source 1 is collected by the microphone 21, and the phase of the synthetic
sound a collected by the microphone 21 is inverted by the phase inversion circuit 23. The
addition circuit 24 adds to the target sound from the sound source 1 and the addition of the
audio signal to the target sound from the sound source 1 by the addition circuit 26 and
outputting the sound signal from the speaker 28 near the outer ear Since the phase of the sound
is inverted and then superimposed on the target sound and output, only the target sound can be
left.
[0030]
Therefore, it is possible to hear only the target sound by causing the unnecessary ambient sound
to interfere with the ambient sound of the opposite phase and eliminating it, instead of
generating a synthetic voice of a sound quality that is easy to hear as in the conventional
example. The target sound can be easily heard even under a level noise environment, and the
sound quality of the sound source can be maintained.
[0031]
Further, in one embodiment of the present invention, ambient sound (noise) other than the target
sound is erased so that only the target sound can be heard without sound quality adjustment
using parameters matched to the conventional ambient sound. As 1 does not require interference
such as returning parameters, it can be used additionally to existing equipment.
[0032]
As described above, according to the present invention, the ambient sound of the headphone
including the target sound from the sound source is collected by the microphone, and the phase
of the ambient sound collected by the microphone is inverted before the sound source By
combining the target sound from the sound source with the target sound from the sound source
and outputting the sound from the speaker to the outside, the target sound can be easily heard
even in a high-level noise environment. The sound quality of can be maintained, and there is an
effect that it can be used additionally to the existing equipment.
[0033]
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Brief description of the drawings
[0034]
1 is a block diagram showing the configuration of an embodiment of the present invention.
[0035]
Fig.2 (a) is a figure which shows the waveform of the ambient sound of headphone vicinity of
FIG. 1, (b) is a figure which shows the waveform of the target sound from the sound source of
FIG. 1, (c) is sound-collected with the microphone of FIG. (D) shows the waveform of the speech
signal whose phase is inverted by the phase inversion circuit of FIG. 1, (e) shows the waveform of
the speech signal synthesized by the addition circuit of FIG. (F) shows the waveform of the
synthesized sound output from the speaker of FIG. 1, (g) shows the waveform of the synthesized
sound that can actually be heard.
[0036]
3 is a block diagram showing the configuration of a conventional speech synthesizer.
[0037]
Explanation of sign
[0038]
DESCRIPTION OF SYMBOLS 1 sound source 2 headphone 21 microphone 22 input volume 23
phase inversion circuit 24 and 26 addition circuit 25 range volume 28 speaker
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