JPS527601

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DESCRIPTION JPS527601
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic electric circuit diagram of a car
stereo to which the present invention is applied. 1, 2, 3, 4 ... IC power amplifier, 5 ... left front
speaker 6 ... right front speaker 1 ... left back speaker 8 ... right back speaker. -1
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a quasi 1-4
channel stereo system suitable for being mounted on a vehicle which can not utilize a
commercial power source such as a car or a small vessel. The challenge with such stereo devices
is that, despite the fact that only a very small battery voltage can be used as the supply voltage, a
large gain must be obtained. In the ninth conventional stereo device, a transformer coupled type
increase circuit is used conveniently as a power booster. However, such a power booster has a
large temperature rise due to incursion and outflow due to its nature. It is necessary to
sufficiently reduce the thermal influence on the circuit elements, and since the transformer can
not be made smaller to keep the distortion rate low, there is a limit to the size reduction and
weight reduction of the stereo device incorporating such a booster. 0 In the above-mentioned
vehicle in which the additional space of the device is narrowly added in order to secure the
necessary and sufficient workability and advisability, the miniaturization of the device is an
important problem. The purpose of the present invention is to be able to accurately answer such
a practical request and to enjoy good stereo performances even if the 2-channel signal is pseudo
4 channels in the reproduction system and it is 2-in 1 vehicle. It is possible to provide a stereo
device that can In the vehicle stereo system according to the present invention, the left-channel
audio signal of the left channel is amplified by a pair of working power amplifiers 1 and 2 which
work differentially, and the left front speaker 5 It is driven by the differential output, and the
audio signal of the light channel is amplified by the pair of XC power amplifiers 8 and 4 which
also work differentially, and the right front speaker 6 is driven by the differential output of the IC
power amplifiers 8 and 4. The left rear speaker 7 is driven by the differential outputs of the IC
power amplifiers 1 and 8 corresponding to each other, and the right rear speaker 8 is similarly
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driven corresponding to each other and driven by the differential outputs of the power amplifiers
2 and 4 It is. The drawing shows an embodiment in which the present invention is applied to a
car stereo, and the IC power amplifier and electrons 2 of the differential amplifier circuit are
connected to the output electrons of the left channel of the car stereo main body 17, The three IC
terminals 10 and 10 of the IC power amplifiers 8 and 4 that make up the differential amplifier
circuit are connected to the output terminal of the light channel of the car stereo body, and all 41
IC power amplifiers have the same custom ing. The power booster circuit includes transistors 11.
Since the transistor switch consisting of the diode 12 and the resistor 18 is incorporated as
shown, this power booster also operates simultaneously with the operation of the car stereo main
body 17.
This stereo equipment vIL can be used for both normal 2 channel stereo and pseudo 4 channel
stereo, and the switching is performed by the matrix switch 14. That is, when the matrix switch
14 is turned to the OFF side, the relays 15 operate and the relay contacts 16 and 17 are switched
as shown in the inside, and the left rear speaker 7 is processed similarly to the left front speaker
5 The right rear speaker 8 is driven by the differential outputs of a pair of IC power amplifiers 8
and 4 in the same manner as the right rear speaker 6. The left channel audio signal is connected
in parallel and 4-reproduced by 7112 left side sliders 5 and 7, and the right channel audio signal
is reproduced by the front & two right speakers 6 and 8 also connected in parallel. It is On the
other hand, when the matrix switch 14 is turned on, the operating current does not flow to the
relay 15. The relay contacts 16 and 17 are switched to the matrix side to form the connection of
the above-described pseudo 4 channel. Thus, the difference signal component of the left channel
and the right channel is extracted and reproduced from the left and right rear speakers 7 and 8,
respectively. As described above, in the stereo device of the present invention, since the power
booster of each channel is configured by the pair of power amplifiers working differentially, the
conventional device incorporating the transformer coupled type amplifier circuit In addition, the
reduction in size and weight of the device can be easily achieved, the operational simplicity is
good, and the distortion rate is also greatly improved. In addition, the direct sound component of
the instrument or vocal is mainly played back by the left and right front speakers 6 and 6 and
output from the right and left rear speakers 7 and 8 by the front left and right speakers 6, -. The
feeling different from the sound field reproduced by the two left and right speakers is obtained.
That is, it is the ninth feature that can reproduce 4-channel sound field quite clearly. Even in
small vehicles such as Yotot and vehicles such as automobiles, it is possible to easily enjoy stereo
performance and the like that are richer in realism.
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