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JPWO2013098974

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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
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DESCRIPTION JPWO2013098974
The portable audio reproduction apparatus is an apparatus for reproducing an audio signal using
an earphone, and includes an apparatus main body, an ordinary person's earphone, and a hearing
impaired person's earphone. The jack (90) of the device body is connected to both a general
person earphone and a deaf person earphone. The connection plug (23) of the hearing aid
earphone (20) is provided with a dummy terminal (23C) substantially insulated from the other
terminals. The audio reproduction circuit of the device main body detects the presence or
absence of the dummy terminal (23C) when the connection plug of the general person earphone
or the connection plug of the hearing impaired earphone is inserted into the jack (90). Switch the
audio amplification mode.
Portable voice reproduction device
[0001]
The present invention relates to a portable audio reproduction apparatus that reproduces an
audio signal by an earphone.
[0002]
For example, portable audio playback devices lent on group tours are required to switch the
audio amplification mode corresponding to the person with hearing loss and the general public.
That is, when the portable voice reproducing apparatus is lent, it is required to set the volume
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according to the person who is deaf or the general person. For example, since it is difficult for the
elderly to hear the high-pitched sound, it is preferable to increase the volume of the high-pitched
area.
[0003]
As means for solving this requirement, it is conceivable to provide a switch such as a high-tone
adjustment switch on the main body of the portable audio reproduction device. For example,
although it is a technology of a hearing aid, Patent Document 1 discloses a technology that
allows the elderly to easily adjust the volume.
[0004]
Unexamined-Japanese-Patent No. 05-130698 gazette
[0005]
However, in the case of a portable audio playback device for lending, explaining to the user of the
audio playback device how to use the high-tone adjustment switch requires time, and in some
cases each person may need to be explained. It is not a preferable means.
[0006]
In addition, even devices other than the portable voice reproduction device for lending, for
example, a portable voice reproduction device for personal use, may be lent within the family, so
the voice amplification mode is provided corresponding to the deaf person and the general
public. It is preferable to have a switching function.
[0007]
An object of the present invention is to provide a portable audio reproduction device capable of
easily switching the audio amplification mode according to the device for the hearing impaired
and the general user.
[0008]
(1) One aspect of the present invention is a portable audio reproduction apparatus for
reproducing an audio signal by an earphone, comprising: an apparatus main body, a first
earphone, and a second earphone, and the apparatus main body reproduces the audio signal And
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a jack connectable to both the first connection plug of the first earphone and the second
connection plug of the second earphone, the first connection plug of the first earphone being A
first common terminal and a first input terminal, and the second connection plug of the second
earphone is a second common terminal, a second input terminal, and the second common
terminal and the second input terminal. An isolated dummy terminal, and the audio reproduction
circuit generates an audio based on the detection of the presence or absence of the dummy
terminal when the first connection plug or the second connection plug is inserted into the jack.
To provide a portable audio playback apparatus for switching issue of audio amplification mode.
[0009]
In this aspect, the dummy terminal is provided only to the second earphone among the first
earphone and the second earphone.
Then, based on the detection of the presence or absence of the dummy terminal, the voice
amplification mode of the voice signal is switched.
Therefore, the voice amplification mode can be switched by the general person and the deaf
person selecting the first earphone and the second earphone.
That is, the audio signal can be reproduced in an audio amplification mode corresponding to the
selected earphone without performing an operation such as setting change in the apparatus main
body.
[0010]
(2) Preferably, when the dummy terminal is detected, the audio reproduction circuit makes the
amplification factor of the audio signal in a high frequency range larger than when the dummy
terminal is not detected.
[0011]
(3) Preferably, when the dummy terminal is not detected, the audio reproduction circuit makes
the amplification factor of the audio signal in a high frequency range larger than when the
dummy terminal is detected.
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[0012]
(4) It is preferable that the audio reproduction circuit compresses the dynamic range of the audio
signal when the dummy terminal is detected than when the dummy terminal is not detected.
[0013]
(5) Preferably, the audio reproduction circuit compresses the dynamic range of the audio signal
when the dummy terminal is not detected than when the dummy terminal is detected.
[0014]
(6) It is preferable that the first earphone and the second earphone have different forms in
appearance.
[0015]
(7) The second earphone further includes an adapter connectable to the second connection plug
and having the same terminal structure as the first connection plug, and the adapter is connected
to the second connection plug. Preferably functions as the first earphone.
[0016]
According to the present invention, it is possible to provide a portable audio reproduction device
capable of easily switching the audio amplification mode corresponding to the device for the
hearing impaired and the general user.
[0017]
FIG. 1 is a schematic view of a portable audio reproduction device according to a first
embodiment.
The block diagram of the apparatus main body of 2nd Embodiment.
FIG. 2 is a circuit diagram when a general person's earphone is connected to a device body in the
first embodiment.
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FIG. 3 is a circuit diagram when the hearing impaired earphone is connected to the device body
in the first embodiment.
The circuit diagram when a general person's earphone is connected to the apparatus main body
in 2nd Embodiment.
FIG. 9 is a circuit diagram when the hearing impaired earphone is connected to the device body
in the second embodiment.
Sectional drawing which shows an adapter in 3rd Embodiment.
In 3rd Embodiment, sectional drawing which shows the state with which the adapter was
mounted | worn with the connection plug of the earphone for deaf people.
[0018]
First Embodiment An example of a portable audio reproduction apparatus will be described.
[0019]
The portable audio reproduction device 1 shown in the present embodiment is a receiver that
receives a signal transmitted from a transmitter, reproduces the received signal as an audio
signal, and reproduces an audio signal with an earphone.
The portable voice reproduction device 1 is used as a receiver used by the guided person, for
example, in the case of transmitting the voice of the guide with a transmitter in the guidance of a
tourist spot, an art museum or the like.
The guided person hears the sound reproduced by the receiver with the earphone.
In the following description, a portable audio reproduction device 1 for reproducing a monaural
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signal will be described.
[0020]
As shown in FIG. 1, the portable voice reproduction device 1 includes a device body 2, a general
person earphone 10 (first earphone), and a hearing impaired person earphone 20 (second
earphone). A volume switch 3 which doubles as a power switch is attached to the side of the
device body 2.
[0021]
The general person earphone 10 is an earphone used by a general person whose hearing ability
is within a reference range. The general person earphone 10 includes a speaker 12, a lead 11 for
transmitting an audio signal, and a connection plug 13 (first connection plug) to which the lead
11 is connected.
[0022]
The lead wire 11 of the general person earphone 10 is provided with a visual identification tag
14 indicating the general person earphone 10 so that the general person earphone 10 and the
hearing impaired earphone 20 can be easily distinguished. .
[0023]
The hearing impaired earphone 20 is an earphone used by a hearing impaired person whose
hearing ability is lower than that of the general public.
For example, the use of elderly people and deaf people whose hearing ability has been reduced
due to illness etc. is assumed. The hearing aid earphone 20 includes a speaker 22, a conducting
wire 21 for transmitting an audio signal, and a connection plug 23 (second connecting plug) to
which the conducting wire 21 is connected.
[0024]
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The lead 21 of the hearing aid earphone 20 is provided with a visual identification tag 24
indicating the hearing aid earphone 20 so that the hearing aid earphone 20 and the general
person earphone 10 can be easily distinguished. .
[0025]
The apparatus main body 2 of the portable audio reproduction apparatus 1 will be described
with reference to FIG.
[0026]
The device body 2 amplifies the sound based on the reception function to receive the signal
transmitted from the transmitter, the reproduction function to reproduce the received signal
(hereinafter referred to as a reception signal), and the type of the earphone inserted in the jack
90 And a reproduction function of reproducing an audio signal by switching the mode.
[0027]
The apparatus body 2 includes an antenna 4 for receiving a transmission signal, an audio
reproduction circuit 5 for detecting and demodulating a reception signal, and a jack 90 for
outputting an audio signal.
[0028]
The audio reproduction circuit 5 includes a detection circuit 30 for detecting a predetermined
frequency signal, a squelch circuit 40 for cutting off an output of an audio signal, an audio
processing circuit 50 for amplifying an audio signal in a predetermined manner, and an amplifier
60 for amplifying an audio signal. , A plug determination circuit 70 for determining the type of
plug, and a control device 80 for instructing the function switching of the audio processing
circuit 50.
[0029]
The detection circuit 30 detects a predetermined frequency signal from the received signal, and
demodulates the detected signal to obtain an audio signal.
For example, the reception signal and the predetermined oscillation signal are mixed to form an
intermediate signal, and this intermediate signal is amplified.
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Next, the FM signal is detected from the intermediate signal to demodulate the FM signal.
Further, the demodulated FM signal is amplified to form an audio signal.
[0030]
The squelch circuit 40 includes a tone detection unit 41, a noise detection unit 42, a carrier
detection unit 43, an AND circuit 44, and a squelch switch 45.
[0031]
The tone detection unit 41 detects a tone signal from the audio signal.
When a tone signal is detected, the output voltage of the output port is set to high level.
[0032]
The noise detection unit 42 detects the noise level from the audio signal.
When the noise level is smaller than the set value, the output voltage of the output port is set to
the high level.
[0033]
The carrier detection unit 43 detects the level of the carrier signal of the reception signal.
When the level of the carrier signal is higher than the set value, the output voltage of the output
port is set to the high level.
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[0034]
The AND circuit 44 turns on the squelch switch 45 when all the output voltages of the output
port of the tone detection unit 41, the output port of the noise detection unit 42, and the output
port of the carrier detection unit 43 are at high level. Output In addition, the AND circuit 44
outputs an off signal to turn off the squelch switch 45 under the conditions other than this
condition.
[0035]
The squelch switch 45 has an on state and an off state. In the on state, the audio signal is allowed
to pass. In the off state, no audio signal is allowed to pass. For example, when the tone signal is
detected, the noise level is smaller than the set value, and the carrier signal is higher than the set
value, the squelch switch 45 is turned on when all these conditions are satisfied. And an audio
signal is output. On the other hand, when at least one of these conditions is not met, the squelch
switch 45 is turned off and no audio signal is output.
[0036]
The audio processing circuit 50 amplifies an audio signal according to the type of plug connected
to the jack 90. Specifically, when the connection plug 13 of the general person earphone 10 is
connected to the jack 90, the audio signal is amplified at a substantially constant amplification
factor over the entire sound range. In the following description, this processing is called normal
processing.
[0037]
On the other hand, when the connection plug 23 of the earphone 20 for the hearing impaired is
connected to the jack 90, the audio signal is amplified with an amplification factor substantially
equal to that in the normal process in the low frequency range, Amplify the audio signal. The
high frequency range is set to, for example, 4 kHz or more, which makes it difficult for the
elderly to hear. The bass range is less than 4 kHz. In the following description, this processing is
referred to as high frequency amplification processing.
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[0038]
The jack 90 can be connected to both the connection plug 13 of the general person earphone 10
and the connection plug 23 of the hearing impaired earphone 20. That is, the number of jacks 90
provided in the device body 2 is one, and is commonly used for the general person earphone 10
and the hearing impaired earphone 20.
[0039]
The plug determination circuit 70 determines whether the plug inserted in the jack 90 is the
connection plug 13 of the general person earphone 10 or the connection plug 23 of the hearing
impaired earphone 20.
[0040]
When the plug determination circuit 70 determines that the plug inserted in the jack 90 is the
connection plug 23 of the hearing aid earphone 20, it sets the output voltage of the output port
to the high level.
[0041]
When it is determined that the plug inserted into the jack 90 is the connection plug 13 of the
general person earphone 10, the plug determination circuit 70 sets the output voltage of the
output port to the low level.
[0042]
The control device 80 issues an instruction to the audio processing circuit 50 based on the
output voltage of the plug determination circuit 70.
[0043]
Specifically, when the output voltage of the output port of the plug determination circuit 70 is at
the high level, that is, when the connection plug 23 of the earphone 20 for the hearing impaired
is inserted into the jack 90, the control device 80 operates the audio processing circuit 50.
Control signal to execute high-frequency amplification processing.
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[0044]
On the other hand, when the output voltage of the output port of the plug determination circuit
70 is low, that is, when the connection plug 13 of the general person earphone 10 is inserted
into the jack 90, the control device 80 Issue control signals to execute the process.
[0045]
The structures of the connection plug 13 of the general person earphone 10, the connection plug
23 of the hearing impaired earphone 20, and the jack 90 will be described with reference to
FIGS. 3 and 4.
As each of the connection plugs 13 and 23, a plug conforming to a standard such as a phone
terminal can be used.
[0046]
As shown in FIG. 3, the connection plug 13 (first connection plug) of the general person
earphone 10 includes a first common terminal 13A and a first input terminal 13B.
[0047]
The first input terminal 13 B is provided at the tip of the connection plug 13.
The first input terminal 13 B is connected to one terminal of the speaker 12.
The first common terminal 13 A is provided at the base of the connection plug 13.
The first common terminal 13A is connected to the other terminal of the speaker 12.
[0048]
As shown in FIG. 4, the connection plug 23 (second connection plug) of the hearing aid earphone
20 includes a second common terminal 23A, a second input terminal 23B, and a dummy terminal
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23C.
[0049]
The second input terminal 23 B is provided at the tip of the connection plug 23.
The second input terminal 23 B is connected to one terminal of the speaker 22.
The second common terminal 23A is provided on the base side of the connection plug 23.
The second common terminal 23A is connected to the other terminal of the speaker 22.
[0050]
The dummy terminal 23C is provided between the second input terminal 23B and the second
common terminal 23A.
The dummy terminal 23C is substantially insulated from the second input terminal 23B, the
second common terminal 23A, and the speaker 22.
[0051]
The jack 90 includes a common electrode 91, an input electrode 92, and a dummy electrode 93.
[0052]
The common electrode 91 contacts the first common terminal 13A when the connection plug 13
of the general person earphone 10 is inserted into the jack 90 (see FIG. 3), and the connection
plug 23 of the hearing aid earphone 20 is inserted into the jack 90. When it is turned off, it
contacts the second common terminal 23A (see FIG. 4).
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12
Further, the common electrode 91 is connected to the ground.
[0053]
When the connection plug 13 of the general person earphone 10 is inserted into the jack 90, the
input electrode 92 contacts the first input terminal 13B (see FIG. 3), and the connection plug 23
of the hearing impaired earphone 20 is inserted into the jack 90. When it is turned off, the
second input terminal 23B is contacted (see FIG. 4). Also, the input electrode 92 is connected to
the amplifier 60. That is, an audio signal is input to the earphone through the input electrode 92.
[0054]
The dummy electrode 93 contacts the first common terminal 13A when the connection plug 13
of the general person earphone 10 is inserted into the jack 90 (see FIG. 3), and the connection
plug 23 of the hearing aid earphone 20 is inserted into the jack 90. When it is released, it
contacts the dummy terminal 23C (see FIG. 4). Also, the dummy electrode 93 is connected to the
plug determination circuit 70.
[0055]
An example of the plug determination circuit 70 and the audio processing circuit 50 will be
described with reference to FIGS. 3 and 4.
[0056]
The plug determination circuit 70 includes a comparator 71.
[0057]
A dummy electrode 93 is connected to the comparator 71.
The dummy electrode 93 is connected to the line of the reference potential Vcc via the resistor
72.
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[0058]
The comparator 71 compares the potential of the dummy electrode 93 (hereinafter referred to as
the dummy potential Vd) with the preset comparison potential Vref, and when the dummy
potential Vd is higher than the comparison potential Vref, the output voltage of the output port is
high level Set to
On the other hand, when the dummy potential Vd is lower than the comparison potential Vref,
the output voltage of the output port is set to the low level. The comparison potential Vref is
larger than the ground potential and smaller than the reference potential Vcc of the control
device 80.
[0059]
The output port of the comparator 71 is connected to the controller 80. As described above, the
control device 80 outputs a control signal indicating that high-frequency amplification
processing or normal processing is to be performed to the audio processing circuit 50 based on
the output voltage of the output port of the plug determination circuit 70.
[0060]
The audio processing circuit 50 includes an operational amplifier 54, three resistors 51, 52, 53, a
capacitor 55, and a switch element 56. In the following description, the resistance value of the
resistor 51 is R1, the resistance value of the resistor 52 is R2, the resistance value of the resistor
53 is R3, and the combined resistance of the parallel connection of the resistors 52 and 53 is
R23.
[0061]
The output terminal of the operational amplifier 54 is connected to the amplifier 60. An audio
signal is input to the positive input terminal of the operational amplifier 54. A resistor 51 is
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14
connected between the output terminal of the operational amplifier 54 and the negative input
terminal. A resistor 52 is connected between the negative input terminal of the operational
amplifier 54 and the ground. A capacitor 55 and a resistor 53 are connected in series to the
negative input terminal of the operational amplifier 54 in parallel with the resistor 52. A switch
element 56 is provided between the capacitor 55 and the resistor 53.
[0062]
Switch element 56 switches the connection state between capacitor 55 and resistor 53.
[0063]
The switch element 56 disconnects between the capacitor 55 and the resistor 53 when receiving
a control signal indicating normal processing from the control device 80.
At this time, the gain of the audio processing circuit 50 becomes the setting gain G1 at all
frequencies. The value of the setting gain G1 is approximately (1 + R1 / R2).
[0064]
The switch element 56 connects the capacitor 55 and the resistor 53 to each other when
receiving a control signal indicating that high frequency amplification processing is to be
performed from the control device 80. At this time, the capacitor 55 is connected to the ground
via the resistor 53.
[0065]
Since the audio signal in the high frequency range is hardly affected by the capacitor, the gain of
the audio processing circuit 50 becomes the setting gain G2 in the high frequency range. The
setting gain G2 is larger than the setting gain G1 and is approximately (1 + R1 / R23).
[0066]
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15
On the other hand, since the audio signal in the low frequency range is affected by the capacitor
55, the gain of the audio processing circuit 50 becomes smaller than the set gain G2 in the low
frequency range. The resistors 51, 52 and 53 and the capacitor 55 are set such that the gain in
the low frequency range is larger than the setting gain G1 in the normal processing.
[0067]
That is, the audio processing circuit 50 amplifies the audio signal by the setting gain G1 in the
normal processing. On the other hand, in the case of high frequency amplification processing, the
audio signal is amplified by the setting gain G2 (> the setting gain G1) in the high frequency
range.
[0068]
Next, the operation of the portable audio reproduction device 1 will be described.
[0069]
First, with reference to FIG. 3, an operation when the connection plug 13 of the general person
earphone 10 is inserted into the jack 90 will be described.
[0070]
At this time, the common electrode 91 of the jack 90 and the dummy electrode 93 are connected
via the first common terminal 13A.
The potential of the dummy electrode 93 is smaller than the ground potential and the equal
potential, ie, the comparison potential Vref.
Therefore, the output voltage of the output port of the comparator 71 of the plug determination
circuit 70 becomes low level.
[0071]
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Based on the fact that the output voltage of the output port has become low level, the control
device 80 issues a control signal to the audio processing circuit 50 to execute normal processing.
In response to this control signal, the audio processing circuit 50 disconnects the capacitor 55
from the resistor 53. In such a circuit state, the audio signal is amplified with the setting gain G1
at all frequencies. That is, normal processing is performed on the audio signal.
[0072]
Next, with reference to FIG. 4, an operation when the connection plug 23 of the hearing aid
earphone 20 is inserted into the jack 90 will be described.
[0073]
At this time, the common electrode 91 of the jack 90 and the dummy electrode 93 do not contact
each other.
The potential of the dummy electrode 93 becomes larger than the reference potential Vcc and
the equal potential, ie, the comparison potential Vref. Therefore, the output voltage of the output
port of the comparator 71 of the plug determination circuit 70 becomes high level.
[0074]
Based on the fact that the output voltage of the output port becomes high level, the control
device 80 issues a control signal to the audio processing circuit 50 to execute high frequency
amplification processing. In response to the control signal, the audio processing circuit 50
connects the capacitor 55 and the resistor 53 to each other. In such a circuit state, the audio
signal is amplified by the setting gain G2 (> the setting gain G1) in the high frequency range.
That is, high frequency amplification processing is performed on the audio signal.
[0075]
The portable audio reproduction device 1 having such a configuration operates as follows.
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[0076]
When the connection plug 13 of the general person earphone 10 is plugged into the jack 90, the
audio signal is normally processed.
When the connection plug 23 of the hearing impaired earphone 20 is inserted into the jack 90,
the audio signal is subjected to high frequency amplification processing. Therefore, by selecting
an earphone to be inserted into the jack 90 of the device body 2, the sound amplification mode
of the sound signal can be switched.
[0077]
Such a portable audio reproduction device 1 is used as follows.
[0078]
For example, when an audio guide is performed in a group tour, the guide delivers the portable
audio reproduction device 1 to each traveler.
At this time, the device body 2 and the hearing aid earphone 20 are handed over to a deaf person
such as an elderly person or a requester. The device body 2 and the general person earphone 10
are delivered to the general person. Each traveler connects the lent device body 2 and the
earphones 10 or 20. By such an operation, it is possible to listen to the voice guide in a voice
amplification mode that matches the hearing ability of each traveler without changing the setting
of the device main body 2.
[0079]
In addition, visual recognition tags 14 and 24 are provided on the general person earphone 10
and the hearing impaired earphone 20 to distinguish between the general person and the
hearing impaired. For this reason, the guide can easily grasp what kind of voice amplification
mode each traveler is listening to the voice guide. The guide can easily determine which
earphones the elderly use.
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[0080]
Second Embodiment A modification of the first embodiment will be described with reference to
FIGS. 5 and 6. FIG.
[0081]
In the first embodiment, the portable audio reproduction device 1 for reproducing a monaural
signal has been described.
In the following modification, a portable audio reproduction device 1 for reproducing a stereo
signal will be described. Hereinafter, a change from the configuration of the first embodiment
which occurs as a result of this change will be described. The same reference numerals are given
to the configuration common to the first embodiment.
[0082]
As shown in FIG. 5, the connection plug 113 (first connection plug) of the general person
earphone 110 includes a first common terminal 113A, a first L terminal 113B, and a first R
terminal 113C.
[0083]
The first L terminal 113 B is provided at the tip of the connection plug 113.
The first common terminal 113 </ b> A is provided on the base side of the connection plug 113.
The first R terminal 113C is provided between the first L terminal 113B and the first common
terminal 113A.
[0084]
The first L terminal 113B is connected to one terminal of the first speaker 112A. On the other
hand, the first R terminal 113C is connected to one terminal of the second speaker 112B. The
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first common terminal 113A is connected to the other terminal of the first speaker 112A and the
other terminal of the second speaker 112B.
[0085]
As shown in FIG. 6, the connection plug 123 (second connection plug) of the hearing aid
earphone 120 includes a second common terminal 123A, a second L terminal 123B, a second R
terminal 123C, and a dummy terminal 123D.
[0086]
The second L terminal 123B is provided at the tip of the connection plug 123.
The second R terminal 123C is disposed next to the second L terminal 123B. The dummy
terminal 123D is disposed next to the second R terminal 123C. The second common terminal
123A is provided at the base of the connection plug 123.
[0087]
The second L terminal 123B is connected to one terminal of the first speaker 122A. On the other
hand, the second R terminal 123C is connected to one terminal of the second speaker 122B. The
second common terminal 123A is connected to the other terminal of the first speaker 122A and
the other terminal of the second speaker 122B. The dummy terminal 123D is substantially
insulated from the second L terminal 123B, the second R terminal 123C, the first speaker 122A
and the second speaker 122B.
[0088]
The jack 190 includes a common electrode 191, an L electrode 192, an R electrode 193, and a
dummy electrode 194.
[0089]
The common electrode 191 contacts the first common terminal 113A when the connection plug
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113 of the general person earphone 110 is inserted into the jack 190 (see FIG. 5), and the
connection plug 123 of the hearing aid earphone 120 is inserted into the jack 190. When it is
closed, the second common terminal 123A is contacted (see FIG. 6).
Also, the common electrode 191 is connected to the ground.
[0090]
When the connection plug 113 of the general person earphone 110 is inserted into the jack 190,
the L electrode 192 contacts the first L terminal 113B (see FIG. 5), and the connection plug 123
of the hearing impaired earphone 120 is inserted into the jack 190. When this happens, the
second L terminal 123B is contacted (see FIG. 6). Also, the L electrode 192 is connected to the
first amplifier 141. That is, an L signal is input to the earphone through the L electrode 192.
[0091]
When the connection plug 113 of the general person earphone 110 is inserted into the jack 190,
the R electrode 193 contacts the first R terminal 113C (see FIG. 5), and the connection plug 123
of the hearing impaired earphone 120 is inserted into the jack 190. When it contacts, it contacts
the 2nd R terminal 123C (refer to Drawing 6). Also, the R electrode 193 is connected to the
second amplifier 142. That is, an R signal is input to the earphone through the R electrode 193.
[0092]
The dummy electrode 194 contacts the first common terminal 113A when the connection plug
113 of the general person earphone 110 is inserted into the jack 190 (see FIG. 5), and the
connection plug 123 of the hearing aid earphone 120 is inserted into the jack 190. When it is
released, it contacts the dummy terminal 123D (see FIG. 6). Also, the dummy electrode 194 is
connected to the plug determination circuit 70.
[0093]
The device body 2 detects a predetermined frequency signal from the received signal, and forms
an L signal and an R signal from the detected signal.
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[0094]
Further, the device body 2 has a plug determination circuit 70 and a control device 80.
The plug determination circuit 70 and the control device 80 have the same configuration as the
plug determination circuit 70 and the control device 80 of the first embodiment. That is, the plug
determination circuit 70 sets the output voltage of the output port to the high level or the low
level based on the result of whether the potential of the dummy terminal 123D is larger than the
comparison potential.
[0095]
Control device 80 issues a control signal for executing either high frequency amplification
processing or normal processing to first audio processing circuit 151 and second audio
processing circuit 152 based on the output voltage of plug determination circuit 70. The same
control signal is output to the first audio processing circuit 151 and the second audio processing
circuit 152.
[0096]
The L signal is amplified by the first audio processing circuit 151 and subsequently amplified by
the first amplifier 141.
[0097]
The R signal is amplified by the second audio processing circuit 152 and subsequently amplified
by the second amplifier 142.
[0098]
The first audio processing circuit 151 and the second audio processing circuit 152 have the
same circuit configuration as the audio processing circuit 50 described above.
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22
That is, the L signal or R signal is amplified in an audio reproduction mode corresponding to the
control signal from the control device 80.
[0099]
Next, the operation of the portable audio reproduction device 1 will be described.
[0100]
First, the operation when the connection plug 113 of the general person earphone 110 is
inserted into the jack 190 will be described with reference to FIG.
[0101]
At this time, the common electrode 191 and the dummy electrode 194 of the jack 190 are
connected to each other through the first common terminal 113A.
[0102]
The potential of the dummy electrode 194 is smaller than the ground potential and an equal
potential, that is, the comparison potential Vref.
For this reason, the output voltage of the output port of the plug determination circuit 70
becomes low level.
Based on the output voltage of the output port becoming a low level, the control device 80
outputs a control signal indicating that the normal processing is to be performed to the first
audio processing circuit 151 and the second audio processing circuit 152.
By this control signal, the L signal and the R signal are amplified with the setting gain G1 at all
frequencies.
That is, normal processing is performed on the L signal and the R signal.
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[0103]
Next, with reference to FIG. 6, the operation when the connection plug 123 of the hearing aid
earphone 120 is inserted into the jack 190 will be described.
[0104]
At this time, the common electrode 191 of the jack 190 and the dummy electrode 194 do not
contact each other.
The potential of the dummy electrode 194 becomes larger than the reference potential Vcc and
the equal potential, ie, the comparison potential Vref. Therefore, the output voltage of the output
port of the plug determination circuit 70 becomes high level. Based on the fact that the output
voltage of the output port has become high level, the control device 80 issues a control signal to
the first audio processing circuit 151 and the second audio processing circuit 152 to execute
high-frequency amplification processing. The L signal and the R signal in the high frequency
range are amplified by the setting gain G2 (> the setting gain G1) by this control signal. That is,
high frequency amplification processing is performed on the L signal and the R signal.
[0105]
The above-described configuration also achieves the same function as that of the first
embodiment.
[0106]
That is, by selecting an earphone to be inserted into the jack 190 of the device body 2, the sound
amplification mode of the sound signal can be switched.
[0107]
Third Embodiment A modified example of the earphone according to the first embodiment will be
described with reference to FIGS. 7 and 8.
[0108]
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In the first embodiment, the hearing aid earphone 20 and the general person earphone 10 are
separately prepared.
In the modification shown below, the hearing aid earphone 20 and the adapter 200 connected to
the hearing aid earphone 20 are prepared.
Then, the adapter 200 enables the use of the hearing aid earphone 20 as the general person
earphone 10.
Hereinafter, a change from the configuration of the first embodiment which occurs as a result of
this change will be described. The same reference numerals are given to the configuration
common to the first embodiment.
[0109]
The adapter 200 will be described with reference to FIG.
[0110]
The adapter 200 includes a plug portion 210 inserted into the jack 90 and a connection portion
220 into which the connection plug 23 of the hearing impaired earphone 20 is inserted.
[0111]
The plug unit 210 includes a third common terminal 210A and a third input terminal 210B.
[0112]
The third common terminal 210A is provided at the base of the plug portion 210.
The third input terminal 210 B is provided at the tip of the plug portion 210.
[0113]
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The external structure of the plug portion 210 is the same as the connection plug 13 of the
general person earphone 10 of the first embodiment.
That is, the external dimensions of the third common terminal 210A and the third input terminal
210B are the same as the external dimensions of the first common terminal 13A and the first
input terminal 13B.
[0114]
The internal structure of the plug unit 210 is configured as follows.
[0115]
That is, the conductor 211 along the central axis of the plug portion 210 is provided in the third
input terminal 210B.
The inside of the third common terminal 210A is hollow, and the conductor 211 is inserted
through the hollow portion.
The conductor 211 and the third common terminal 210A are insulated. The tip of the conductor
211 contacts the tip of the second input terminal 23B of the connection plug 23 inserted into the
adapter 200.
[0116]
The connection portion 220 is an extended portion of the third common terminal 210A. The
connection part 220 is formed in a cylinder. On the inner periphery of the connection portion
220, an internal electrode 221 is formed in contact with the second common terminal 23A and
the dummy terminal 23C of the connection plug 23 inserted into the adapter 200.
[0117]
A state in which the connection plug 23 of the hearing aid earphone 20 is inserted into the
09-05-2019
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adapter 200 will be described with reference to FIG.
[0118]
At this time, the conductor 211 of the third input terminal 210B contacts the second input
terminal 23B of the connection plug 23 of the hearing aid earphone 20.
Therefore, the third input terminal 210B is connected to one terminal of the speaker 22.
[0119]
The internal electrode 221 of the third common terminal 210A contacts the dummy terminal
23C and the second common terminal 23A of the connection plug 23 of the hearing aid
earphone 20. Therefore, the third common terminal 210A is connected to the other terminal of
the speaker 22.
[0120]
That is, the hearing aid earphone 20 to which the adapter 200 is attached constitutes the general
person earphone 10.
[0121]
According to such a configuration, preparing the hearing aid earphone 20 and the adapter 200 is
substantially the same as preparing the hearing aid earphone 20 and the general person
earphone 10.
Therefore, the deaf person earphone 20 and the adapter 200 also have the same function as that
of the first embodiment.
[0122]
According to each embodiment, the following effects can be obtained.
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27
[0123]
(1) In the portable audio reproduction device 1 of each embodiment, the dummy terminals 23C
and 123D are not provided in the connection plugs 13 and 113 of the general person earphone
10, and the dummy terminals are connected to the connection plugs 23 and 123 of the hearing
impaired earphone 20. 23C and 123D are provided.
Then, by detecting the presence or absence of the dummy terminals 23C and 123D, the type of
plug inserted in the jack 90 is determined, and the audio amplification mode of the audio signal
is switched according to the type of plug.
[0124]
According to this configuration, it is possible to switch the sound amplification mode of the
sound signal by the general person and the deaf person selecting the general person earphone
10 and the deaf person earphone 20. That is, the user can reproduce the audio signal in an audio
amplification mode corresponding to the selected earphone by connecting the earphone to the
portable audio reproduction device 1 without performing an operation such as setting change in
the device main body 2 Can.
[0125]
(2) In the present embodiment, when the dummy terminals 23C and 123D are detected, the
amplification factor of the audio signal in the high frequency range is set larger than when the
dummy terminals 23C and 123D are not detected. That is, when the hearing aid earphone 20 is
connected to the jack 90, the amplification factor of the audio signal is set large in the high
frequency range.
[0126]
According to this configuration, a person who selects the hearing aid earphone 20 can hear a
sound whose sound pressure level in the high range is increased by inserting the hearing aid
earphone 20 into the jack 90.
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[0127]
(3) In the present embodiment, the visual identification tags 14 and 24 are provided on the
general person earphone 10 and the hearing impaired earphone 20.
That is, the general-purpose earphones 10 and the hearing-impaired earphones 20 have different
appearances. Therefore, the administrator of the portable voice reproduction device 1 can easily
determine which of the general person earphone 10 and the hearing impaired earphone 20 the
user is using. Also, the administrator of the portable voice reproduction device 1 can
appropriately advise the user of the portable voice reproduction device 1 as to whether or not an
earphone suitable for the user is used.
[0128]
(Other Embodiments) The embodiments of the present invention are not limited to the
embodiments exemplified in the above-described embodiments, and can be modified as follows,
for example. Further, each of the following modifications is not limited to the above
embodiments, and different modifications may be combined with each other.
[0129]
In the first embodiment, although the visual identification tags 14 and 24 are attached to both
the general person earphone 10 and the hearing impaired earphone 20, the visual identification
tags 14 and 24 may be attached to only one of them. Also with this configuration, it can be easily
grasped from the outside as to which of the general person earphone 10 and the hearing
impaired earphone 20 the user is using.
[0130]
-Moreover, it replaces with the visual recognition tags 14 and 24, and the seal | sticker which can
distinguish the earphone 10 for general persons and the earphone 20 for hearing-impaired
09-05-2019
29
persons by appearance may be affixed. Also, the color or pattern of the leads of each earphone
may be made different from each other. In either configuration, since the general person
earphone 10 and the hearing impaired earphone 20 can be distinguished in appearance, the
effect according to the above (3) is exhibited.
[0131]
In the above embodiments, when the hearing aid earphone 20 is inserted into the jack 90, the
sound pressure level is increased in the high frequency range of the sound signal, but the sound
amplification aspect of the sound signal is not limited to this. That is, the sound amplification
processing when the hearing aid earphone 20 is inserted into the jack 90 may be processing for
converting the sound into a sound that the deaf person can easily hear.
[0132]
For example, when the hearing aid earphone 20 is plugged into the jack 90, compression
processing of the dynamic range of the audio signal may be performed. Specifically, in the audio
signal, conversion processing is performed to reduce the sound component whose sound
pressure level is larger than the first set value, and conversion processing is performed to
increase the sound component whose sound pressure level is smaller than the second set value.
Is done. As a result, the sound pressure level is too high and the offensive sound is reduced, and
the sound pressure level is reduced and the sound that is hard to hear becomes large. According
to such dynamic range compression processing, the audio signal is converted into a sound that is
easy for the deaf person to hear.
[0133]
Therefore, according to this configuration, by inserting the hearing aid earphone 20 into the jack
90, the width of the sound pressure level (the difference between the maximum value and the
minimum value of the sound pressure level. ) Can hear the narrowed voice.
[0134]
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In the above embodiments, the two-terminal plug earphone is used as the general user earphone
10, and the three-terminal plug earphone is used as the hearing aid earphone 20. It may be That
is, an earphone with a two-terminal plug structure may be used as the hearing aid earphone 20,
and an earphone with a three-terminal plug structure may be used as the general-purpose
earphone 10. In this case, when the dummy terminal 23C is not detected, audio amplification
processing such as high frequency amplification processing or dynamic range compression
processing is performed on the audio signal.
[0135]
-Although the receiver which receives the signal transmitted from the transmitter is mentioned as
an example of the portable audio | voice reproduction apparatus 1 in said each embodiment, this
invention is not limited to this application. That is, the present invention can be applied to any
audio reproduction apparatus that reproduces an audio signal by an earphone. For example, the
present invention can be applied to portable audio devices, mobile phones, and portable
computers.
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