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JPH0557940

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DESCRIPTION JPH0557940
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle audio device, so-called car audio output device, and in particular, in addition to the
built-in power amplifier, an external device to be connected as required. The present invention
relates to one having a pre-out terminal for a power amplifier.
[0002]
2. Description of the Related Art There are many types of car audio equipment with the spread of
automobiles. Among them, for audio output units, power amplifiers are used for stereo
applications. There is a type in which one power supply is built in and another power supply is
available by using two sets of pre-outs. A block diagram of this type is shown in FIG. 2, but the
car audio unit 1 has an output terminal 2 for the front speaker and an external for another front
speaker drive, which is optionally connected. It has a power amplifier pre-out terminal 3 and an
external power amplifier pre-out terminal 4 for driving a rear speaker, and as shown in the
figure, the external amplifiers 5, 6, front speakers 7, 8, Connect to rear speaker 9 and use. In
addition, in order to simplify the drawing, one channel in the case of stereo is omitted. One of the
disadvantages of this type is that there is only a possibility of development as a system by
selecting an external amplifier or speaker to be connected.
[0003]
SUMMARY OF THE INVENTION The present invention seeks to provide the possibility of further
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development as a system of the type described above.
[0004]
In the present invention, in order to provide the possibility of development as a system, by
providing a changeover switch for utilizing the pre-out terminal of the external power amplifier
for another front speaker drive for further application, I solved the problem.
[0005]
The changeover switch provided in the circuit system of the external power amplifier terminal
for the front speaker drive is used as an external power amplifier terminal for the original front
speaker drive. By adding a function as an external power amplifier terminal for sub speaker
speaker drive to the function and switching between these functions, the possibility of
development as a system increases. .
[0006]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows an embodiment of the
present invention, which has the following components in a car audio main body 10 in which a
part of the contents is omitted.
That is, the audio output is distributed to the front side and the rear side by the voice volume 12
connected to the volume 11 to which the audio signal is input, and the front side is further
divided into the front speakers. The system is divided into a route leading to the output terminal
18 through the built-in dual amplifier 14 for the motor and a route to the preamplifier 15 for the
front pre-out, and for the rear through the preamplifier 16 to the output terminal 20 It is
connected with.
[0007]
Numeral 13 denotes a sub volume for receiving the above-mentioned audio signal, and its
variable output signal is connected to one selection terminal 26 of the changeover switch 17.
The output of the preamplifier 15 for the front pre-out is connected to one selection terminal 27
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of the changeover switch 17.
The common terminal 28 of the changeover switch 17 is connected to the terminal 19 for the
external amplifier 21. 22 is an external amplifier for the rear, and 23, 24, 25 are speakers. As in
FIG. 2 of the conventional example, one channel in the case of stereo is not shown.
[0008]
With the above configuration, if the changeover switch 17 is switched to the terminal 27 side, an
output as an external amplifier terminal for another front speaker drive is derived from the
terminal 19 as in the conventional example. When the speaker 24 as a front speaker is driven,
while the changeover switch 17 is switched to the terminal 26 side, the signal from the substrate
volume 13 is derived to the terminal 19, and the external The power is amplified by the amplifier
21 to drive the speaker 24 for the sub wafer.
[0009]
The speaker 23 as a front speaker is driven by a built-in front speaker power amplifier 14, and
the speaker 25 as a rear speaker is driven by an external amplifier 22. The balance is controlled
by the feder volume 12.
[0010]
As described above, according to the present invention, it is possible to add a switching function
to this type of car audio which has been lacking in the conventional development ability and to
use a sub-wafer. As it is configured as described above, it is possible to improve both the sense of
reality and the sound, and the practical effects are extremely large.
[0011]
Brief description of the drawings
[0012]
1 is a block diagram of the circuit of the embodiment of the present invention.
[0013]
2 is a block diagram of a circuit of the conventional example.
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[0014]
Explanation of sign
[0015]
13 Fedder volume 14 Built-in power amplifier for front speaker 15 Preamplifier for front pre-out
16 Pre-amplifier for remote out 17 Selection switch 18 Built-in power amplifier output terminal
for front speaker 19 Different front speaker Pre-out terminal 20 Re-appli out terminal
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