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JP2003125481

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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 JP2003125481
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproduction apparatus, and more particularly to a portable audio reproduction apparatus.
[0002]
2. Description of the Related Art Conventionally, this type of portable audio reproducing
apparatus reproduces audio with an earphone type speaker, but in order to make the
reproduction output of a low frequency signal close to the original sound, the earphone and
inner ear secret It was configured to enhance the sex.
[0003]
However, in the above-described conventional portable audio reproducing apparatus, the
reproduction output of a low frequency signal can be brought close to the original sound by
enhancing the confidentiality of the earphone and the inner ear. Because the degree of contact
between the earphones and the inner ear is high, surrounding sounds do not enter the ears,
making it difficult to hear surrounding sounds or sounds, and it is difficult to hear surrounding
sounds, so traffic accidents may occur. There was a problem.
[0004]
The present invention has been made to solve the above-mentioned conventional problems, and
it is a portable voice reproduction device in which the surrounding sound is not difficult to hear
even if the confidentiality of the earphones and the inner ear is increased to bring the
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reproduction output closer to the original sound. It is provided.
[0005]
A voice reproduction apparatus according to the present invention adds a microphone for
collecting surrounding voice, a voice reproduction block for reproducing voice, and a collected
surrounding voice signal and a reproduced voice signal. Signal adding means, amplifying means
for amplifying the added audio signal, and an earphone-type speaker for outputting the audio
signal from the amplifying means as audio.
With this configuration, the confidentiality of the earphones and the inner ear is enhanced, or
even if the ambient sound is hard to hear due to the large absolute value volume of the
reproduced sound, the microphones are used to collect the ambient sound through the
earphones. By listening, it is possible to prevent the surrounding sounds from being difficult to
hear.
[0006]
The audio reproduction device in the present invention is provided in a terminal device having a
microphone, and has a configuration in which the microphone of the terminal device is used in
place of the microphone for collecting the surrounding sound.
With this configuration, it is not necessary to provide a microphone for the purpose of collecting
surrounding sound.
[0007]
The audio reproduction device in the present invention has a configuration in which a
microphone for collecting the surrounding sound is provided outside the main body of the audio
reproduction device.
With this configuration, even when the audio playback apparatus is housed in a place where it is
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difficult for the surrounding audio to reach, if the microphone alone is installed in a place where
the surrounding audio can be easily collected, the surrounding audio can be collected properly. it
can.
[0008]
The sound reproducing apparatus according to the present invention has a configuration in
which the microphone for collecting the surrounding sound is integrated with the earphone type
speaker and disposed at a position where the sound is collected. With this configuration, by
disposing the microphone in a position where the surrounding sound can be collected without
fail by contacting the surrounding, even when the sound reproducing device main body is stored
in a place where the surrounding sound is hard to reach, the surrounding can be properly Sound
can be collected.
[0009]
The audio reproduction apparatus according to the present invention includes mixing variable
means for setting the mixing ratio between the surrounding sound collected by the microphone
and the sound reproduced by the sound reproduction block, wherein the signal addition means
sets the mixing ratio. The mixing variable according to the information from the external I / O
and an external I / O for inputting information for setting the mixing ratio between the
surrounding sound collected from the microphone and the sound reproduced by the sound
reproduction block A control means is provided for arbitrarily setting the mixing ratio of the
surrounding sound and the reproduced sound in the means. With this configuration, it is possible
to output the surrounding sound collected from the microphone at an arbitrary level in
accordance with the output level of the reproduction sound by the sound reproduction device.
[0010]
The audio reproduction apparatus according to the present invention is configured to include an
AGC circuit that is connected to the microphone and makes the output level of the ambient sound
collected from the microphone constant. This configuration makes it possible to output the
surrounding sound at a constant level even in a place where the variation of the surrounding
sound is large.
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[0011]
The audio reproduction apparatus according to the present invention takes in the surrounding
audio collected from the microphone and the audio reproduced by the audio reproduction block,
transmits it to the control means, and mixes the ratio between the surrounding audio and the
reproduced audio. Is configured to automatically set a DSP. According to this configuration, it is
possible to automatically output the output level of the surrounding sound collected from the
microphone with an appropriate value with respect to the output level of the reproduction sound.
[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first to seventh embodiments
of the present invention will be described in detail with reference to the attached drawings. (First
Embodiment) First, with reference to FIG. 1, the configuration of an audio reproduction
apparatus according to a first embodiment of the present invention will be described. The audio
reproduction device 1 in the present embodiment is an audio reproduction means for
reproducing an audio consisting of the microphone 2 and the audio reproduction block 5, and a
signal addition consisting of mixing variable resistors (mixing variable means) 4 and 6 and a
mixing amplifier 7. Means, a signal amplification means comprising an output amplifier 8, and an
earphone-type speaker 9 for generating sound. The earphone-type speaker 9 may be configured
to be directly connected to the sound reproducing apparatus main body, or may be separately
connected and detachably connected by a connector.
[0013]
Next, with reference to FIG. 1, the operation of the audio reproduction apparatus in the first
embodiment of the present invention will be described. First, ambient sound collected by the
microphone 2 is mixed with the sound reproduced by the sound reproduction block 5 by the
mixing amplifier 7 according to the mixing ratio set for the mixing variable resistors 4 and 6, and
then output. The signal is amplified by the amplifier 8 and output as sound from the earphone
type speaker 9. As described above, the surrounding sound is mixed with the reproduced sound
and transmitted from the earphone type speaker 9 to the ear. Even if it can not be directly
transmitted to the ear, ambient sound can be heard from the earphone type speaker 9.
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[0014]
Second Embodiment Next, referring to FIG. 1, an audio reproduction apparatus according to a
second embodiment of the present invention will be described. The audio reproduction apparatus
according to the present embodiment is configured by incorporating the audio reproduction
apparatus 1 according to the first embodiment of the present invention into a portable
communication terminal. Then, by using the microphone of the mobile communication terminal
as the microphone 2, that is, by sharing the microphone of the mobile communication terminal
with the microphone 2 of the audio reproduction device 1, a microphone for collecting
surrounding sound is separately provided. There is no need to provide it, and the device can be
miniaturized.
[0015]
Third Embodiment Next, with reference to FIG. 2, an audio reproduction apparatus according to a
third embodiment of the present invention will be described. The audio reproduction apparatus
according to the present embodiment is configured by providing the microphone 2 of the audio
reproduction apparatus 1 according to the first embodiment of the present invention shown in
FIG. The other components are the same as those shown in FIG. As described above, in the
present embodiment, even when the voice reproducing device main body is stored in a place
where the surrounding voices are hard to reach, if the microphone 2 is installed in a place where
the surrounding voices are easily collected, the surrounding voices Sounds easier to collect.
[0016]
Fourth Embodiment An audio reproduction apparatus according to a fourth embodiment of the
present invention will now be described with reference to FIG. The sound reproducing apparatus
according to the present embodiment has the microphone 2 of the sound reproducing apparatus
1 according to the first embodiment of the present invention shown in FIG. It is arranged at a
position where sound can be generated, that is, a position optimum for collecting sound. The
other components are the same as those shown in FIG. As described above, in the present
embodiment, the microphone 2 is always disposed at a position where it can collect surrounding
sound even when the sound reproducing apparatus main body is stored in a place where it is
difficult for the surrounding sound to reach. Can surely collect the surrounding sound.
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[0017]
Fifth Embodiment First, with reference to FIG. 4, the configuration of an audio reproduction
apparatus according to a fifth embodiment of the present invention will be described. The audio
reproduction apparatus according to the present embodiment is a mixing variable resistance to
the signal addition means including the mixing variable resistors 4 and 6 and the mixing
amplifier 7 of the audio reproduction apparatus 1 according to the first embodiment of the
present invention shown in FIG. An external I / O 11 for inputting information for setting
resistance values of 4 and 6 and a CPU 10 as control means for setting resistance values of
mixing variable resistors 4 and 6 according to information from the external I / O 11 Do. The
other components are the same as those shown in FIG.
[0018]
Next, with reference to FIG. 4, the operation of the audio reproduction device in the fifth
embodiment of the present invention will be described. First, ambient sound collected by the
microphone 2 is set to an arbitrary value by the CPU 10 setting the resistance value of the
mixing variable resistors 4 and 6 based on the information set by the external I / O 11 In
accordance with the above, the sound reproduced by the sound reproduction block 5 and the
mixing amplifier 7 are mixed, then amplified by the output amplifier 8 and outputted as a sound
from the earphone type speaker 9. As described above, in the present embodiment, since the
output level ratio between the surrounding sound level and the reproduced sound level can be
arbitrarily set, the ratio of both sound levels is changed according to the preference and the
situation. be able to.
[0019]
Sixth Embodiment First, with reference to FIG. 5, the configuration of an audio reproduction
apparatus according to a sixth embodiment of the present invention will be described. The audio
reproduction apparatus according to the present embodiment has AGC 12 added in parallel to
microphone input amplifier 3 of audio reproduction apparatus 1 according to the fifth
embodiment of the present invention shown in FIG. Configure. The other components are the
same as those shown in FIG.
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[0020]
Next, with reference to FIG. 5, the operation of the audio reproduction device in the sixth
embodiment of the present invention will be described. First, ambient sound collected by the
microphone 2 is adjusted to a constant level by the AGC 12 and input to the mixing variable
resistor 4. The audio signal is reproduced by the audio reproduction block 5 according to the
mixing ratio arbitrarily set by the CPU 10 setting the resistance value of the mixing variable
resistors 4 and 6 based on the information set by the external I / O 11 After being mixed by the
mixing amplifier 7, the signal is amplified by the output amplifier 8 and output as sound from the
earphone type speaker 9. As described above, in the present embodiment, the absolute value
volume of the surrounding sound collected by the microphone 2 is constant, and the surrounding
sound of this constant volume is output even at a place where the change of the surrounding
sound is large. And it is easy to adjust the ratio of the output level of the ambient sound output
level to that of the reproduced sound.
[0021]
Seventh Embodiment First, the configuration of an audio reproduction apparatus according to a
seventh embodiment of the present invention will be described with reference to FIG. The audio
reproduction apparatus according to the present embodiment inputs surrounding audio signals
and reproduced audio signals to the audio reproduction apparatus 1 according to the sixth
embodiment of the present invention shown in FIG. A digital signal processor (hereinafter
referred to as a DSP) 13 is added to configure the values of the resistors 4 and 6 to be
automatically set by the CPU 10 so as to obtain a predetermined mixing ratio. The other
components are the same as those shown in FIG.
[0022]
Next, with reference to FIG. 6, the operation of the audio reproduction device in the seventh
embodiment of the present invention will be described. First, the surrounding audio signal
collected by the microphone 2 and the audio signal reproduced by the audio reproduction block
5 are input to the DSP 13, and the absolute value signal level information of both audio signals is
notified to the CPU 10. When the setting of the external I / O 11 is automatic, the CPU 10
automatically sets the mixing ratio to an appropriate value by automatically setting the values of
the mixing resistors 4 and 6 based on the absolute value signal level information from the DSP
13. The audio signal whose mixing ratio is adjusted by the mixing resistors 4 and 6 is mixed by
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the mixing amplifier 7, then amplified by the output amplifier 8, and output as sound from the
earphone-type speaker 9. As described above, in the present embodiment, it is possible to
automatically set the surrounding sound level collected from the microphone to an appropriate
value with respect to the output level of the reproduction sound and output it.
[0023]
The sound reproducing apparatus according to the present invention is configured as described
above, and in particular, the sound of the ambient sound is collected by the microphone, added to
the reproduced sound, and output from the earphone to reproduce the low frequency signal.
Since the output is brought closer to the original sound, it is possible to prevent the surrounding
sound from being difficult to hear even if the sensitivity of the earphones and the inner ear is
increased.
[0024]
Brief description of the drawings
[0025]
1 is a block diagram showing the configuration of an audio reproduction apparatus according to
the first embodiment of the present invention;
[0026]
2 is a block diagram showing the configuration of an audio reproduction apparatus according to
a third embodiment of the present invention;
[0027]
3 is a block diagram showing the configuration of an audio reproduction apparatus according to
the fourth embodiment of the present invention;
[0028]
4 is a block diagram showing the configuration of an audio reproduction device according to the
fifth embodiment of the present invention;
[0029]
5 is a block diagram showing the configuration of an audio reproduction device according to the
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sixth embodiment of the present invention,
[0030]
6 is a block diagram showing the configuration of an audio reproduction device according to a
seventh embodiment of the present invention.
[0031]
Explanation of sign
[0032]
DESCRIPTION OF SYMBOLS 1 audio reproduction apparatus 2 microphone 3 microphone input
amplifier 4 and 6 mixing variable resistance 5 audio reproduction block 7 mixing amplifier 8
output amplifier 9 earphone type speaker 10 CPU11 external I / O12 AGC13 DSP
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