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DESCRIPTION JPH04287528

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DESCRIPTION JPH04287528
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
wireless signal transmission of an audio reproduction apparatus, and more particularly to the
configuration of a signal transmission / reception apparatus.
[0002]
2. Description of the Related Art As a system for converting an electric signal into an optical
signal for space transmission, there are proposed in JP-A-63-152250, JP-A-64-68030, etc. The
present invention relates to a modulation / demodulation system, and a configuration of a sound
source device and headphones has been presented as an audio reproduction device. However, the
use of headphones is limited as a way of listening to music, and when the sound source device is
at a distant position, it has to go to the sound source device every time the disc is exchanged, The
benefits of wireless were diminishing.
[0003]
Further, in the case of adopting analog transmission of an audio signal by light, since the signal is
deteriorated by space transmission, there are problems with sound quality such as increase of
noise.
[0004]
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1
SUMMARY OF THE INVENTION The present invention provides a configuration of an optical
transmission / reception apparatus which can effectively utilize the advantages of wireless space
transmission as an audio reproduction apparatus while adopting digital transmission of an audio
signal by light. The purpose is to achieve new usage and enjoyment by making the audio system
wireless and to achieve high sound quality by digital transmission.
[0005]
SUMMARY OF THE INVENTION In the present invention, a music source and an operation unit
are integrated, from which a signal is optically and digitally transmitted to a speaker, and a signal
processing circuit, an amplifier and a power supply are integrated on the speaker side. As a
result, the user of the audio device can be operated at hand, and the wireless layout between the
speaker and the speaker enables free layout of the device.
[0006]
The reproduction signal of a CD or tape which is a music source is converted to an EFM format
which is a signal recording format of a CD, and then generation of data which causes the light
emitting diode to emit light as a digital signal suitable for light transmission. The light is
modulated by code conversion means with a low probability, and is emitted to the space as an
infrared output from the light emitting diode.
[0007]
On the speaker side, an infrared signal is received by a photodiode to obtain a received electric
signal, and then EFM format demodulation and digital signal processing are performed to
reproduce a digital audio signal.
This signal is restored to a music signal through a digital / analog converter, then amplified by an
amplifier built into the speaker to drive the speaker.
Since the signal processing circuit in the speaker and the power supply circuit of the amplifier
are also integrated with the speaker, it is completely wireless between the light transmission side
with the music source and the speaker side, and the arrangement of the device can be freely
performed. It becomes like.
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2
[0008]
Further, since light transmission is performed, the problems of interference and interference
which are easily generated by the conventional radio wave system are eliminated, and music
reproduction with high sound quality can be performed.
[0009]
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
FIG. 1 is a block diagram of an optical free space transmission apparatus according to an
embodiment of the present invention.
An audio signal taken out by a music performance apparatus such as a CD 3 or tape 4 is
modulated to a digital signal and input to the light emitting unit 2 to drive a light emitting diode.
The output of the light emitting diode becomes an optical digital signal 6 of infrared light and is
emitted from the light emitting unit 2 to space.
Further, the operation unit such as the key input unit 5 is also integrated as the optical wireless
transmission device 1 together with the CD 3, the tape 4 and the light emitting unit 2.
[0011]
On the other hand, in the wireless receiving speaker 7 on the receiving side, the light digital
signal 6 is received by the light receiving unit 8 using a photodiode, the light amount is
converted to an electric signal by the receiving circuit, and demodulation and digital signal
processing are performed.
The demodulated and signal processed digital audio signal passes through a digital / analog
converter (D / A converter) to obtain an analog audio signal. The audio signal is amplified by an
amplifier circuit (amplifier) provided in the wireless reception speaker 7 to drive the speaker.
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Also, a power supply circuit for supplying power to these circuits is also in the wireless receiving
speaker 7 and takes power through the power plug 9.
[0012]
According to this embodiment, when the user of the audio apparatus exchanges the music source
CD 3 or tape 4 or controls the system from the key input unit 5, the light is integrated into one.
The wireless transmission device 1 can be operated at hand. It is not necessary to draw a speaker
code between the optical wireless transmission device 1 and the wireless reception speaker 7 for
transmission by infrared rays. In addition, since all the circuits from light reception to ringing of
the speaker are integrated in the wireless reception speaker 7, the layout of the speaker can be
freely laid out.
[0013]
The wireless transmission system modulates the infrared light with a digitalized audio signal, so
that the problem of an increase in noise generated from signal deterioration in space
transmission, which occurs in the transmission system by the conventional optical analog signal,
or The problems of interference and interference generated by the conventional radio wave
system are eliminated, and the same sound quality as that of the wired connection is obtained.
[0014]
Although the light emitting unit 2 is integrated in the optical wireless transmission apparatus 1
in FIG. 1, substantially the same effect can be obtained even if the light emitting unit 2 is
separated from the optical wireless transmission apparatus 1 and connected by a wire. You can
raise
[0015]
Further, although the power supply of the wireless reception speaker 7 is taken from the outside
through the power supply plug 9 in FIG. 1, incorporating a battery further increases the freedom
of arrangement.
[0016]
Next, the circuit operation of an embodiment of the present invention will be described with
reference to the block diagram of the free space optical transmission apparatus of FIG.
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[0017]
The digital signal extracted from the CD 3 is input to the digital modulation circuit 12.
Since the signal reproduced from the tape 4 is analog signal, it is analog / digital converted in the
digital modulation circuit 12 and then modulated to the same format as CD.
As another music source, for example, when the tuner 10 is connected, the same processing as
the tape 4 is performed.
The digital modulation circuit 12 further modulates the signal of the CD format (EFM format)
into a type suitable for optical transmission, and outputs the signal to the light emitting unit 2.
The light emitting unit 2 drives the light emitting diode to emit light as infrared light digital
signal 6 to the space.
[0018]
On the other hand, the signal from the key input unit 5 is taken into the system control unit 30,
which controls the entire apparatus and drives the remote control transmission diode 13 to
output the remote control signal 14.
[0019]
The above circuit is integrated with the power supply circuit 11 as an optical wireless transmitter
1.
[0020]
Next, on the reception side, the light receiving section 8 receives the optical digital signal 6,
demodulates it into the EFM format, and obtains a digital audio signal by the digital signal
processing circuit.
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This signal is converted back to an analog signal by the D / A converter, amplified to a level at
which the speaker can be driven by the audio amplifier, and finally reproduced from the speaker
20 as sound.
[0021]
The remote control signal 14 is taken from the photodiode 15 to the control unit 16 to control
the volume and the like.
[0022]
The circuit in the speaker is supplied with power from the power supply 17, and the wireless
receiving speaker 7 is integrated in the form of an amplifier built-in speaker.
[0023]
In the embodiment of FIG. 2, the light emitting unit 2 and the remote control transmission diode
13 are separate diodes, but they can be superimposed and sent as a signal from one diode.
In this case, the two signals can be distinguished from each other at the modulation frequency on
the receiving side.
[0024]
Next, of one embodiment of the present invention, the signal modulation / demodulation system
will be described in detail with reference to the digital modulation / demodulation circuit block
diagram of FIG.
[0025]
When the CD 3 is used as a music source, the signal is taken out by the pickup 21 and an EFM
signal 29 is obtained from the RF amplifier 22.
Next, the EFM signal 29 is modulated by the code conversion means so that the probability of
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6
occurrence of data emitted by the diode becomes low so that the EFM signal 29 becomes a
digital signal suitable for optical transmission, and the light emitting diode of the light emitting
unit 2 Is emitted to the space as an infrared light digital signal 6.
[0026]
The light receiving unit 8 receives the optical digital signal 6 and converts the light signal into a
current.
The current becomes a voltage in the IV conversion 24, only the necessary band of the signal is
taken out in the filter 25, the waveform is reshaped in the data slice 26, and the original EFM
signal is obtained when passing through the EFM signal demodulation 27.
This signal is converted to a digital audio signal by digital signal processing 28 and output to the
next D / A converter.
[0027]
As described above, according to the present invention, the user of the audio reproducing
apparatus can operate at hand and the wireless communication with the speakers enables free
layout of the apparatus. Besides the advantages of wireless transmission, optical digital
transmission can also achieve high-quality music playback.
[0028]
Brief description of the drawings
[0029]
1 is a block diagram of an optical free space transmission apparatus showing one embodiment of
the present invention.
[0030]
FIG. 2 is a block diagram of an optical free space transmission apparatus for explaining the
circuit configuration of one embodiment of the present invention.
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[0031]
FIG. 3 is a block diagram of a digital modulation / demodulation circuit for explaining in detail
the modulation / demodulation system of a signal according to an embodiment of the present
invention.
[0032]
1 · · Optical wireless transmitter, 2 · · Light emitting unit, 6 · · Optical digital signal, 7 · · · Wireless
reception speaker, 8 · · · Light receiving unit.
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