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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 4 are system diagrams of the
conventional sound reproducing apparatus, and FIGS. 5 to 6 and 8 are system diagrams of the
sound reproducing apparatus in the embodiment of the present invention, FIG. 7 is a figure
which shows the speaker attachment state in the apparatus. 1 ··· · · · · · · · monaural radio unit, 2
200 · · · · · · · stereo player 1 player, 4L, LR, 53, 63 · · · · · · · · · · · · · 100・・・・
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an audio
reproduction apparatus comprising a radio and a tape player or separately provided, and
combining them with two speakers. The purpose is to eliminate the change in the sound source
between the radio of the channel source only and the two-channel stereo tape player. : M-Di 1
Tax /, Kubu "2/2 Conventional devices of this type are as shown in FIG. Stereo tape player unit
21 front speaker 3. The rear speaker 4L + 4kL is the main component. Further, the symbol
indicates the middle portion of the low frequency tank. In this configuration, the speaker 3
sounds when the monaural radio unit 1 is operating, and the speaker 4L or 4k sounds when the
stereo tape player unit 2 is operating. Also, there was a drawback that the use of three speakers
would be expensive. In addition, although in FIG. 2 the signal @ 6 and the two speakers 4L + 4) L
for sending audio output from the monaural radio unit 1 to the stereo tape player unit 2 are /
stems, although the number of speakers is reduced, monaural radio When the unit 1 is in
operation, only one of the speakers 4L and 4R sounds, and when the stereo is in operation, both
sound. The device of FIG. 3 which is an improvement of this is one having a resistor 6 for
dividing the signal into two, but the power consumed by this resistance gap 5-5 or resistance 6 is
a dog, and the movement of the sound source Even if the problem was solved, there was a
drawback that the change in volume was large. In this case, the resistance 6 may be divided by a
non- <LIJ − line, but the impedance of the speaker with respect to the monaural radio unit 1 is
halved, and there is a problem of becoming an overload for the amplification unit of the
monaural radio unit 1C. Further, as shown in FIG. 4, although it is preferable to provide two
amplification parts in the monaural radio part 1, there is a drawback that the price is reduced.
The present invention eliminates such a drawback and will be described below by way of
examples. First, as shown in FIG. 6, when the monaural radio unit 1 operates, there is no
movement of the sound source because the switch 4 is short-circuited and the speakers 4L and 4
are driven in series. Also, the amplification part of the monaural radio part 1 is not overloaded.
Similarly, when the stereo tape player unit 2 is operated, a short circuit is shorted, and the
speakers 4L + 41 are driven in series, and there is no problem with the above-mentioned points.
In this case, monaural radio section 1. Switching to the switch 7 in conjunction with the
operation of the 1 to 4 player unit 2 to the stereo Q is linked with the switch incorporated in the
stereo tape player unit 2 so that the operation is simplified and the device shown in FIG. In this
case, the relays 9 connected in parallel to the power supply line 8 which goes from the stereo
tape player unit 2 to the monaural radio unit 1 are provided. Then, a voltage is induced to the
power supply line 8 by the radio / tape player discrimination means in the stereo tape player
unit 2, so that the drive coil of the relay 9 operates. Therefore, the same effect as that of FIG. 5
can be obtained. In addition, when driving two speakers 4L and 4R, it is a matter of course that
the respective polarities must be matched, and by connecting as shown in FIG. 5 and FIG. 16, this
condition is satisfied, and the unnaturalness of the sound source Can be eliminated. Furthermore,
in the case of a lift-back type vehicle as shown in the off view, the speaker 4L at the position 10
on the instrument panel. It is particularly advantageous if the 4R can not be arranged. Fig. 8 is
mainly composed of the player, and the player side is able to cope with the case of mono and (the
case of ral and stereo, 51161 is a player signal terminal, 62 is a signal terminal, 62 is an
amplifier, and 53.63 is a signal. Speakers corresponding to 4L and aR in FIG. 6, 64 + 55 + 64 +
66 are selector switches corresponding to 7 in FIG. 100 is a stereo / monaural switch, 200 is a
player including 51.61-100, 201 is a radio side, and 202 + 203 is a tuner. In this case, when the
tuner connects 202 + 203 to the player 200, only 2 o 2 may be connected to the player 200.
Therefore, when two switches 202 and 203 are used, the switch 100 can obtain a stereo output
by the chain 202 + 203 from the speaker 53. 63 by using it in the state shown in the figure. On
the other hand, in the case where one tuner 202 is used, the same effect as described in the
previous embodiment can be expected by switching the switch 100. As is apparent from the
above description, according to the present invention, the sound source and the volume change
when the speakers of the + 2 \ 5 island 6 radio and the stereo tape player are shared and one of
the two is switched to the other. Can be prevented.
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