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M. fillll @ 1 Title of the Invention Wireless System Acoustic Signal Reproducing Apparatus (1) A
liquid crystal circuit for producing a pulse width modulation signal from an acoustic signal,
having linearly polarized light obtained from a light emitting element through an opening
element, The polarization direction is oscillated in two directions by applying an electric field
when passing the linearly polarized light through a specific optically isotropic substance with an
electric signal obtained from the modulation modulation. A wireless acoustic signal reproduction
apparatus comprising: means for producing modulated light by removing one linearly polarized
light by an analyzing element on the transmission side, and having the liquid portion.
a Claim scope
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention a relates to a wireless
audio signal reproduction apparatus. 2. Description of the Related Art Conventionally, a device
for amplifying an acoustic signal and a so-called speaker device for converting the electric signal
into a voice are usually connected close to each other for convenience. However, there are cases
where such an acoustic signal reproduction device a, conditions of installation location and other
reasons (a device for amplifying a sound W signal from C, and a speaker device are used at a
distance far apart). In such a case, in order to transmit the signal from the amplifier of the
acoustic signal to the speaker, it has been necessary to extend the tangent M line for a long time.
At this time, in order to consume power by the resistance of the lead wire, extra power has to be
sent to the beaker device more than necessary to drive the speaker from the amplifier 1, such as
In order to eliminate the drawbacks, a wireless system has been proposed that transmits sound
gong No. 1g using light. When light is used as a transmission medium, AM modulation or B'FA
modulation is mainly used as a modulation method. In particular, FM modulation is often used
because it can transmit the signal '67' LM. However, there is a disadvantage that the circuit
becomes complicated and the scale becomes large. In such an optical deflection system, a light
emitting diode (hereinafter referred to as D) is used as a light emitting element on the
transmission side, and a light receiving element such as a photodiode is often used on the
receiving side. FIG. 1 shows a configuration of a transmission unit of an audio signal
reproduction apparatus according to the conventional EndPage: 1 wireless system. The acoustic
signal recorded on the recording medium (1) is reproduced into an acoustic signal by the signal
reading device +21. The 廿 W signal is amplified by the low frequency layer M unit (31) and sent
to the modulator (4). Modulator (4) modulates the acoustic signal according to the rz, Pjr
constant modulation scheme, and the amplifier (5) t-i is sent to the final stage, and the final stage
is a transistor (61 and LK 送信 (81 At a maximum rating of 1 [a current control resistor (7) for
use in the flow, and according to the modulation signal, the current supplied to the transmission
LED (81 is controlled to control the modulation light, where Since the luminous efficiency of L,
ED is as low as 1 to 2%, in order to obtain the required luminous intensity, as shown in FIG. In the
speaker apparatus (FIG. 2) on the receiving side, the phototransistor (9) receives the modulated
light, performs charge conversion, and is detected by the detection ffaQG. The sound reference
signal is amplified by the low frequency layer #M unit συ, and the cascaded speaker (6) is
driven to be reproduced as an acoustic signal.
In general, a class B amplifier / S unit is used as a low frequency amplifier 1 for driving a speaker
on the receiving M side. Although the Eiut source efficiency is said to be at most 78%, it is at
most 1 o to 20% under normal use conditions, which is disadvantageous in terms of power
supply efficiency. Also, since power is consumed in most of the transistors, there is a problem of
heat dissipation in the transistor. In particular, in order to combine the speaker system into one
(in the case where the installation of ii @ Gll ヲ x peaker is incorporated in a friend's speaker box
(for example, when the reception side speaker device is so-called wireless head 7 on X)) It is
necessary to add special equipment to the heat dissipation process that occurs in the K, l-fister. In
order to solve the drawbacks of the conventional wireless system sound 1 signal reproducing
apparatus according to the present invention, the circuit configuration is simplified and the
power supply efficiency is improved. The following describes f # steel. FIG. 6 shows a block
diagram of one embodiment of the present invention. The sixth meat (g transmission g1 part is
shown in FIG. 4 the receiving part, ie the speaker system part). In FIG. 6, the friend acoustic
signal recorded in the recording medium ω is reproduced into the signal f 讐 by the signal
reading device. The acoustic signal Sμ is amplified by the low frequency amplifier concave and
sent to the voltage ratio #R unit O. In the voltage comparator αη, as shown in FIG. 5, the
triangular wave output is compared with the above-mentioned f11 signal output from the
triangular wave generator side (refer to the waveform 5 in FIG. 5) and the acoustic signal voltage
is higher than the triangular wave voltage Signal voltage of "Hj-gh", and "L + OW" if lower (refer
to the waveform (D) in FIG. 5). Therefore, the output from the voltage comparator port is a pulse
width modulation ff (hereinafter referred to as PWM) in which a Harun signal equal to the
repetitive frequency force V triangle tR unit mantissa is modulated into pulses according to the
level of the acoustic signal. . The repetition Mlfl number of the triangular wave is used
approximately 10 to 20 times the maximum II4 wave number of the acoustic signal handled by
the device. This is to satisfy the sampling theorem and to take care not to enter the side band or
the acoustic signal band by modulation. Also, when the acoustic signal voltage exceeds the peak
value of the triangular wave, chryso 1 distortion occurs, so that the gain of the low frequency
amplifier output is suppressed so that this does not occur. Also, instead of triangular wave,
sawtooth 1! l can also be used. Voltage comparison-The PWM wave output from Q9 is amplified
on the pulse amplifier side and added to the optically isotropic substance @. On the other hand,
acoustic g from recording media When the reproduction of the sound signal Ill1 is started by the
number readout device α4, the acoustic signal readout device 11 (14+ sends out a signal to
drive the transistor @ t-, and the transistor (2) becomes an ON-shaped wire.
Therefore, when reproduction of the acoustic signal starts, LmDQli starts to emit light. 1. Ii; I)
The ink source sent out from Q9 is a natural light having no deflection direction. Therefore, light
emitted from this LKDQ 9 is transmitted through the polarization element (support) into only one
direction of $ 171 [M-polarized light is transmitted to the optically isotropic substance 4 as Mpolarization. As this linearly polarized light passes through the isotropic material, it repeats the
cycle of application and removal of the electric field to the radioactive material by sampling the
PWM signal modulated with the acoustic signal as described above. It is possible to turn the light
swinging surface. This phenomenon is called electro-optical 1 err effect and is a known collision.
Among the exclusively used substances, for example, nitrobenzene, nitrotoluene and the like are
remarkable in this effect. Therefore, when light is linearly polarized through the polarizing
element (2), an electric field is applied to the isotropic substance when the "Hlgkl" EndPage: 2 of
the signal of the PWM wave, and the polarization direction is rotated, and so on. The electric field
is removed from the anisotropic material and the polarization direction remains as it was.
Therefore, when passing through the isotropic substance (2), two linearly polarized light beams
having different light oscillation directions corresponding to the two states “Hlgkl” and LIOW
of the PWM wave signal are generated. At this time, the photometry element (c) can be taken out
of one of the PWM waves "Hl, gh". The intermittent light corresponds to the signal of PWMfi
modulated by the acoustic signal. FIG. 4 shows the configuration of the receiver or speaker. The
transmission modulation light is received by the light source 1- 1 and is photoelectrically
converted and then amplified by the pulse amplifier, and the transmission frequency component
is removed by the subsequent low pass filter gradient, and only the acoustic signal component is
extracted. Be done. The acoustic signal drives the speaker cage and the acoustic signal is
reproduced. As described above, compared to the conventional wireless optical signal
reproduction apparatus using optical communication using the FMV control method, the
transmission unit of the present invention has a circuit compared to a large-scale and
complicated circuit of the transmission unit. It has the ability to be small and simple in
construction and scale. Power supply efficiency can also be improved. For example, the switching
transistor (not shown) in the final stage of the pulse amplifier □□□ for driving the speaker
takes two states of saturation state and cutoff state, and the loss is only switching loss. is there.
Therefore, in the normal use condition, the power supply efficiency of the class B amplifier is at
most about 10 to 20%, but in the PWM amplifier, the t source efficiency is considerably high
even in the normal condition of use.
Therefore, conventional B grade increase II! In the case of incorporating an amplifier in the
speaker box, it was necessary to add a special device to dissipate the heat generated by the
transistor to the outside. There is no need for a special device to dissipate the heat generated by
the transistors.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a 10-diagram showing the transmitter of the
conventional device, FIG. 2 is a block diagram showing the receiver of the conventional device,
and FIG. 6 is a prock diagram showing the transmitter of the device of the present invention. FIG.
4 is a block diagram showing a receiver of the device of the present invention, and FIG. 5 is an
operation waveform diagram. D: recording medium, Q41: reading device, 40: pulse width
modulation signal); Three bird's eye generator and voltage comparator for producing; ■:
polarizing element, threatening: isotropic substance, 鱒: analyzing light The element (d) is a light
receiving means, and 弼 is a low pass filter (demodulation means). Applicants Sanyo Electric Co.,
Ltd. Atsushi Sakai Sano Toshio Sano EndPage: 3
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jps5724195, description
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