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JPH0511559

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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 JPH0511559
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
headphone device for use in a stereo device or the like, and more particularly to a headphone
device for transmitting and receiving wirelessly.
[0002]
2. Description of the Related Art A headphone device for transmitting and receiving audio output
such as stereo by a so-called wireless system has conventionally been connected an antenna
device 3 to the rear output terminal of the stereo device 1 by a wire 4 as shown in FIG. The
output signal of the reproduction circuit is oscillated from the antenna device 3 and is received
by the headphone device 6 provided with the receiving circuit 5.
[0003]
Further, in an AV apparatus not having such an oscillation means, a so-called FM transmitter
apparatus is connected to a rear output terminal of an amplifier apparatus or the like.
As shown in FIG. 6, this FM transmitter device 6 has a signal line 9 disposed at the rear output
terminal 8 of various AV devices 7 and transmits an audio signal input from the signal line 9
from the antenna 10 as a radio wave. The other radio wave tuner is received by another FM
tuner device 11. When the audio signal is to be auditioned by the headphone 12, the headphone
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terminal 15 is inserted and attached to the headphone terminal 14 of the FM tuner device 11,
and the received audio is reproduced and auditioned.
[0004]
On the other hand, with the progress of integrated circuit technology in recent years, the circuit
configuration on the receiving side is also simplified, and various smaller receiving devices with
better performance have been proposed. FIG. 7 shows an example of a so-called headphone radio
in which a circuit capable of directly receiving and reproducing an FM radio signal is
incorporated in a headphone device. In the figure, 16 is a headphone main body, 17 is a speaker
unit, and 18 is a receiving and reproducing circuit. The reception and reproduction circuit 18
itself functions as a radio, and includes the loading coil 20 of the FM antenna, the external
antenna terminal 21, the signal reproduction IC chip 22, the music selection volume switch unit
23, the display unit 24 and the like.
[0005]
[0005] AM / FM radio wristwatches that are smaller than such headphone radios are also well
known in the prior art, and the size of the apparatus is further miniaturized on the receiving side,
such as receiving stereo broadcasts using dynamic earphones. There is. The configuration of such
a radio-equipped wristwatch is basically the same as that of the above-mentioned headphone
radio, but improvements such as using a silver oxide battery as a power supply battery or
providing an earphone jack terminal are added for the purpose of miniaturization. ing.
[0006]
By the way, in the wireless headphone device, as a result of being interrupted by the
conventional signal wiring, the distance restriction by the wiring can be freed or the
troublesomeness of the wiring cord can be eliminated. Although it is used, in the conventional
headphone device, there is a problem that the freedom of the user is not realized, for example,
the type of use is limited or the FM signal that can be received by the headphone device is
limited.
[0007]
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That is, since the wireless headphone device is limited by the Radio Law etc., the radio wave
transmitted from the tuner device or the like can be suppressed to the extent that it can be
received at one house.
According to the current regulations, it is required to be a weak current of 15 μV / m or less at a
distance of 100 m. In this case, in the conventional headphone device, the transmission
frequency on the transmission side and the reception frequency on the headphone side are set in
advance, thereby avoiding signal interference. For example, if the device is different even if it is
the same model as an adjacent house. There is no signal interference.
[0008]
However, such a conventional headphone device can not freely transmit and receive audio
signals of other types such as, for example, an existing television and an additional CD device
because the transmission and reception frequency is set in advance. Also, although the FM
transmitter device can freely transmit signals to other types of devices, this device requires an
FM tuner device on the receiving side, so it can not listen to audio signals with ordinary
headphones without a wiring cord. Furthermore, in the case of a wireless headphone radio that
can directly listen to an audio signal from an FM station, it is not possible to listen to an audio
signal such as a CD device or a video device in a home, and it is not possible to freely select a
signal.
[0009]
Therefore, the object of the present invention is to allow free selection of multiple types of audio
signals without interference when transmitting audio signals in a home area and listening with
wireless headphones in any model. The point is to
[0010]
SUMMARY OF THE INVENTION In order to achieve the above object and achieve the object, the
headphone device according to the present invention reproduces the input audio signal and the
headphone terminal which can be inserted into the audio signal output terminal. It is technically
premised that the headphone device includes a headphone device comprising a signal
modulation means for modulating a signal inputted from an audio output terminal, and a switch
means for selecting a modulation waveform mode in the signal modulation means. A voice signal
transmission means comprising antenna means for oscillating and sending out a voice signal in
the modulation mode under weak power of a predetermined value or less, and the reproduction
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means comprises voice for receiving the signal oscillated from the voice signal transmission
means A signal receiving means, a selective tuning means for selecting and tuning the
modulation mode of the received signal, and a signal for demodulating the output of the selective
tuning means And an audio signal receiving means comprising a demodulation means.
[0011]
Since the headphone device according to the present invention is provided with the audio signal
transmitting means on the headphone terminal side, the audio signal of the existing television,
radio device, etc. can be transmitted from the antenna under the weak power as it is.
At this time, the signal modulation means modulates the input audio signal in accordance with
the modulation waveform mode selected by the switch means.
As a modulation method, various methods such as A / D conversion and pulse width modulation
of input signals, pulse amplitude modulation, pulse phase position modulation, pulse code
modulation, etc. can be used other than so-called FM modulation and frequency modulation. In
indoor wireless devices, it is necessary to keep the antenna short in order to miniaturize the
device, so high frequency light and short wavelength bands, particularly in the range from FM
wave or less to infrared light
[0012]
On the other hand, since the reproduction means side is provided with the reception means for
demodulating the sound signal thus transmitted, it becomes possible to listen to the output sound
of various AV devices at a distant position. At this time, the signal mode to be received is
designated by the selective tuning means. This may be signal type designation or frequency
selection. If the tuning circuit on the reception side is set according to the signal mode on the
oscillation side, a simpler circuit configuration can be achieved. For example, if transmission and
reception are limited to FM signals only, the receiving side may be configured as only tuning
circuits.
[0013]
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Therefore, if the headphone terminal on the oscillation side is inserted into the audio output
terminal of an arbitrary AV apparatus, the audio music of the AV apparatus can be listened at a
remote position by the headphone on the receiving side. Even when a plurality of people oscillate
different voice signals in the same room or in the same house, if the signal mode of the
transmission side is changed by the switch means and the reception side is also adjusted to the
signal mode, each other Interference does not occur
[0014]
Embodiments of the present invention will be described below with reference to the attached
drawings. The headphone device according to the present invention has an appearance
configuration as shown in FIG. 2, for example, and basically comprises a transmission side device
30 and a reception side device 41. Here, the transmitting side device 30 includes a headphone
terminal 31, a transmitting unit 32 incorporating a signal processing circuit and an antenna, and
a channel 33 for switching and setting a signal frequency and the like, and one receiving side
device 41 includes an antenna and signal processing A receiver unit 42 incorporating a circuit, a
speaker unit 43 for signal reproduction, and a hanger cap 49 are provided.
[0015]
FIG. 1 shows an example of the internal configuration of the transmitter 32 and the receiver 42.
As shown in FIG. The transmitting unit 32 includes a signal modulation circuit 34 that modulates
a signal input from the headphone terminal 31. The signal modulation circuit 34 performs, for
example, FM modulation, and the frequency at that time is set by switching by the channel 33.
The channel 33 may be provided with a mechanical contact terminal (movable contact) to switch
the connection of a resistor array or the like to change the resistance value of the signal
modulation circuit 34, but more simply using a digital switch Drive the varicap in the IC circuit
and perform frequency conversion
[0016]
Further, in order to facilitate the miniaturization of the antenna 35, it is desirable to increase the
transmission frequency as much as possible (by shortening the wavelength), for example, in the
infrared light band, but when the frequency becomes too high Since it is difficult to reproduce
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voices as well as reception, using an FM wavelength that is easy to transmit and receive is the
best way to simplify the circuit configuration. For use in the indoor area, for example, as shown
in FIG. 3, the antenna 35 uses an oscillating coil with a longitudinal dimension of about 9 mm in
which a metal wire 36 of about 0.8φ is wound about seven times around a rod with a diameter
of about 5φ. Just do it. The output of the signal modulation circuit 34 is sent to the receiver 41
by the antenna 35.
[0017]
Here, as a power source of the oscillating portion 32, it is possible to use a so-called button
battery such as a silver oxide battery lithium battery which is compact and stable in voltage. This
is because the entire circuit can be driven with a voltage of about 1.5V. Of course, the size may
be slightly larger than that of a button battery, but a conventional battery such as an AAA or AAA
battery may be used. However, if used only in a normal room, it is possible to eliminate the need
for an external battery by storing the DC component of the input audio signal in the capacitor in
the IC circuit. In such a case, it is necessary to connect the headphone terminal 31 to an audio
output terminal capable of extracting an output of at least 110 mW (preferably 0.5 W, which is
five times that).
[0018]
On the other hand, the receiving unit 42 comprises an audio signal receiving circuit 44 for
receiving a signal oscillated and sent from the antenna 35 of the oscillating unit 32, a selective
tuning circuit 45 for selecting and tuning the modulation mode of the received signal, And a
signal demodulation circuit 46 for demodulating the output of the selective tuning circuit 45. In
this configuration, except for the selective tuning circuit 45, the basic configuration is the same
as that of the conventional headphone radio. The selective tuning circuit 45 is for tuning to the
frequency of the oscillation device 30, and it is not always necessary to be able to receive and
tune the broadcast wave transmitted from a normal radio station. The selection tuning circuit 45
may be similar in appearance to a tuner dial in a headphone radio or the like in the appearance
configuration, but has a frequency range in which at least the transmission radio wave of the
transmission side device 30 can be received. In addition, when the transmission side device 30
performs pulse modulation and the like, the mode switch is required accordingly.
[0019]
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Therefore, according to such a headphone device, by inserting the headphone terminal 31 of the
oscillation side device 30 into the audio output terminal of an arbitrary AV device such as a
television, a CD device, etc., the speaker unit 43 of the reception side device 41 The audio music
of the AV device can be heard at a remote position. Even when a plurality of people oscillate
different audio signals in the same room or in the same house, the signal mode of the
transmission side device 30 is set by the channel 33, and the reception side device 41 is also
selected by the selective tuning circuit 44 Or, according to the frequency, interference due to
each other's signals does not occur. As a result, each person can freely enjoy audio music in the
same room and in the same house
[0020]
FIG. 4 shows an example in which a plurality of oscillating devices 61 to 65 are mounted on an
amplifying device 50 having a plurality of output terminals 51 to 55. The amplifier device 50
inputs, for example, the signals of simultaneous interpretation at international conferences, etc.,
separately for each Japanese language. Therefore, each of the oscillators 61 to 65 can transmit
audio signals different for different languages by setting the channels 71 to 75. With such a
system configuration, the receiving device 90 can receive and listen to any Japanese language
interpreter by channel switching. Even if many people are present at the same venue, the channel
settings of their receiving devices allow each person to select an appropriate interpreting voice.
In this case, it goes without saying that the reception side device 90 has the number of reception
channels corresponding to the number of channels on the transmission side.
[0021]
The headphone device according to the present invention does not necessarily require a so-called
headphone terminal type transmitter, and the terminal and the transmitter may be designed
independently, and both may be connected by a wire. In that case, the transmitter may be larger
than that of the above embodiment.
[0022]
As described above, the headphone device according to the present invention has the audio
signal transmitting means on the headphone terminal side, while the reproducing means has the
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receiving means for receiving and demodulating the audio signal. Therefore, it is possible to
transmit an audio signal of an existing television, radio device, etc. as it is under weak power and
to directly receive and listen wirelessly. Therefore, if the headphone terminal on the oscillation
side is inserted into the audio output terminal of an arbitrary AV device, the audio music of the
AV device can be listened at a distant position by the headphone on the receiving side, and also
in the same room or in the same house In this case, even when a plurality of people oscillate
different voice signals, if the signal mode on the transmission side is changed by the switch
means and the reception side is also matched to the signal mode, each person does not cause
interference due to mutual signals. Can enjoy audio music freely.
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