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JPH0641297

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH0641297
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
composite audio apparatus generally called an amplifier built-in speaker.
[0002]
2. Description of the Related Art As shown in FIG. 1, a typical typical speaker with built-in
amplifier accommodates a speaker 2, an amplifier 3 and a volume regulator VR in a box-shaped
container 1. It is configured by doing.
[0003]
By the way, when two speakers with built-in amplifier shown in FIG. 1 are used to make a stereo
system, the volumes of the left and right channels must be operated independently. Bad sex.
It is possible to manufacture a stereo amplifier built-in speaker that has both left and right
channel speakers and an amplifier built into one box, but if there is not much demand for the
device in the market, monaural speaker built-in speaker and stereo If both the amplifier and the
built-in speaker are manufactured, mass productivity declines and the cost inevitably increases.
[0004]
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Therefore, an object of the present invention is to provide a composite audio apparatus which
can be used both for monaural reproduction and stereo reproduction, and also has good
operability when used for stereo reproduction.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
provides a container, a speaker attached to the container, and first, second and third members
attached to the container. An input terminal, an output terminal attached to the container, first
and second amplifiers connected to the first and second input terminals and housed in the
container, the second amplifier, and the output The first signal line connecting to the terminal,
the second signal line for selectively transmitting the output of the second amplifier, and the
output signal of the second amplifier at the time of monaural reproduction A switch for
transmitting the signal on the second signal line and blocking transmission of the output signal
of the second amplifier through the second signal line in stereo reproduction, and a third signal
line connected to the third input terminal The output signal of the first amplifier and the second
signal A summing circuit for summing the signal of the line and the signal of the third signal line
and sending it to the speaker, a first and a first side provided integrally with or at the input side
or the output side of the first and second amplifiers The present invention relates to a composite
audio apparatus provided with a second volume controller and a common operation means for
interlockingly operating the first and second volume controllers.
As described in claim 2, the third input terminal can be omitted.
[0006]
In the case of monaural reproduction using the composite audio apparatus of the present
invention, a signal source device is connected to one or both of the first and second input
terminals. On the other hand, in the case of stereo reproduction, two composite audio devices are
prepared, and the signal sources of the first and second channels are connected to the first and
second input terminals of one composite audio device, and The switch is operated to connect the
output terminal of the device to the third input terminal of the other device and to disconnect the
second signal line of one device from the second amplifier. When the stereo system is configured
in this way, it becomes possible to simultaneously adjust the volume of the first and second
channels by operating the common operation means of one device, which is convenient for use
and manufacture of a device only for stereo reproduction is possible. Since it becomes
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2
unnecessary, it can respond flexibly to various demands in the market. In the case of claim 2, the
output terminal of one device is connected to the first or second input terminal of the other
device at the time of stereo reproduction, and the volume of the other device is set to the
maximum. Thereby, the same operation and effect as in claim 1 can be obtained.
[0007]
First Embodiment A composite audio apparatus comprising an amplifier and a speaker according
to a first embodiment of the present invention will be described with reference to FIGS. 2 and 3.
FIG. This composite audio apparatus is, as shown in FIG. 2, a speaker 2, a first and a second
amplifier 3, 4 and an output amplifier 5, and a first and a second volume adjuster (volume) in a
box type container 1. 6 and 7 and first and second balancer resistors 8 and 9, and further, first,
second and third input jacks 10 as first, second and third input connection means. , 11 and 12,
and an output jack 13 as an output connecting means.
[0008]
The first input jack 10 has a first input terminal 14 and a ground terminal 15, and the second
input jack 11 has a second input terminal 16 and a ground terminal 17. The input jack 12 has a
third input terminal 18 and a ground terminal 19, and the output jack 13 has an output terminal
20, a ground terminal 21, and a hook switch 22 of a normally closed configuration.
[0009]
The first input terminal 14 of the first input jack 10 is connected via the first volume controller
6, the first balancer resistor 8, the first amplifier 3, the summing circuit 25 and the output
amplifier 5. It is connected to the speaker 2.
The second input terminal 16 of the second input jack 11 is the output terminal of the output
jack 13 via the second volume adjuster 7, the second balancer resistor 9, the second amplifier 4
and the first signal line L1. 20 are connected to the speaker 2 via the hook switch 22 of the
output jack 13, the second signal line L2, the adder circuit 25 and the output amplifier 5. The
third input terminal 18 of the third input jack 12 is connected to the speaker 2 via the third
signal line L 3, the adder circuit 25 and the output amplifier 5. The ground terminals 15, 17, 19,
21 of the jacks 10, 11, 12, 13 and the ground terminals of the speaker 2 are commonly
connected.
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[0010]
A knob 23 as interlocking operation means of the first and second volume adjusters 6 and 7 and
a knob 24 as interlocking operation means of the first and second balancer resistors 8 and 9 are
provided outside the container 1. It is arranged.
[0011]
When the composite audio device of FIG. 2 is used for monaural playback, an audio signal source
is provided to one or both of the first and second input terminals 14 and 16 of the first and
second input jacks 10 and 11, respectively. Are connected by a plug (not shown).
Now, assuming that the signal source is connected only to the first input terminal 14, the first
input terminal 14, the first volume adjuster 6, the first balancer resistor 8, the first amplifier 3,
and the adder circuit 25. The signal is sent to the speaker 2 through the and the output amplifier
5. If an audio signal source is connected only to the second input terminal 16, the second input
terminal 16, the second volume adjuster 7, the second balancer resistor 9, the second amplifier
4, and the second amplifier 4 are used. A signal is sent to the speaker 2 via the signal line L1 of
1, the hook switch 22 of the output jack 13, the second signal line L2, the adder circuit 25 and
the output amplifier 5. If the left and right channel signal sources for stereo reproduction are
connected to the first and second input terminals 14 and 16, the outputs of the first and second
amplifiers 3 and 4 are added by the addition circuit 25 and output It is sent to the amplifier 5
and the mixed sound of the left and right channels is obtained from the speaker 2.
[0012]
For stereo reproduction, two composite audio devices A and B having the same configuration as
in FIG. 2 are prepared as shown in FIG. 3, and the output jack 13 of the first device A and the
second device B are prepared. And the third input jack 12 of the second embodiment with a
connection cord 28 having plugs 26 and 27. That is, the output terminal 20 of the output jack 13
of the first device A is connected to the input terminal 18 of the third input jack 12 of the second
device B, and the ground terminals 21 and 19 are also connected to each other. When the plug
26 is inserted into the output jack 13 of the first device A, the hook switch 22 is turned off and
the connection between the second amplifier 4 and the second signal line L2 in the first device A
is cut off. The audio signal sources of the left and right channels are connected to the first and
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4
second input terminals 14 and 16 of the first device A. Thus, the left channel signal is
transmitted to the speaker via the input terminal 14 of the first device A, the first volume
adjuster 6, the first balancer resistor 8, the first amplifier 3, the adder circuit 25 and the output
amplifier 5. , The right channel signal is sent to the input terminal 16 of the first device A, the
second volume regulator 7, the second balancer resistor 9, the second amplifier 4, the first signal
line L1, and the output terminal. The signal is sent to the speaker 2 via the connection cable 28,
the input terminal 18 of the second device B, the third signal line L 3, the adder circuit 25 and
the output amplifier 5. At the time of this stereo reproduction, the volume of both channels can
be adjusted with one operation knob 23 of the device A, and the balance between left and right
can be adjusted with one operation knob 24 of the device A. Therefore, although the stereo
reproduction system is configured by the first and second apparatuses A and B having the same
configuration, the operability is excellent.
[0013]
FIG. 6 shows a stereo reproduction system having a simple two-channel stereo mixer function. In
this method, the output jack 13 of the first device A is plugged into the third input jack 12 of the
second device B in order to perform mixed reproduction of the first stereo signal and the second
stereo signal. And the third input jack 12 of the first device A and the output jack 13 of the
second device B are connected with the cord 31 having the plugs 29 and 30. Also, the R and L
channels of the first stereo signal are connected to the first and second input jacks 10 and 11 of
the first device A, and the L and R channels of the second stereo signal are connected to the
second device B. To the first and second input jacks 10, 11. Thereby, the R channel signal of the
first stereo signal is sent from the first input jack 10 of the first device A to the speaker 2 of the
first device A, and the L channel signal of the first stereo signal is the first The second input jack
11 and the output jack 13 of the device A, the cord 28, and the third input jack 12 of the second
device B are sent to the speaker 2 of the second device B by a path. In addition, the R channel
signal of the second stereo signal is transmitted through the path including the second input jack
11 and the output jack 13 of the second device B, the cord 31, and the third input jack 12 of the
first device A. The L channel signal of the second stereo signal is sent to the speaker 2 of the first
device A from the first input jack 10 of the second device B. As a result, a mixed output of R
channel signals of the first and second stereo signals is obtained from the speaker 2 of the first
device A, and the first and second stereo signals are obtained from the speaker 2 of the second
device B. The mixed output of the L channel signal of
[0014]
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Second Embodiment Next, a second embodiment shown in FIGS. 4 and 5 will be described.
However, in FIG.4 and FIG.5, the same code | symbol is attached | subjected to the part in
common with FIG.2 and FIG. 3, and the description is abbreviate | omitted. The composite audio
apparatus of the second embodiment of FIG. 4 is the same as that of FIG. 2 except that the third
input jack 12 is omitted from the composite audio apparatus of FIG. When monaural
reproduction is performed by the apparatus of FIG. 4, it is used as in the case of FIG.
[0015]
When stereo reproduction is performed using two devices shown in FIG. 4, they are connected as
shown in FIG. That is, the output jack 13 of the first device A and the first input jack 10 of the
second device B are connected by the connection cord 28. Further, the first volume adjuster 6 of
the second apparatus B is set to the maximum volume, and the first balancer resistor 8 is set to
be the largest share. When left and right channel signals are input to the first and second input
jacks 10 and 11 of the first device A, the left channel signal is sent to the speaker of the first
device A through the same path as in FIG. Be The right channel signal is sent to the output jack
13 of the first device A in the same manner as in FIG. 3 and then input to the first input jack 10
of the second device B, and from here the speaker of the second device B Sent to 2
[0016]
Also in the second embodiment, both channels can be simultaneously adjusted by the operation
knobs 23 and 24 of the first apparatus A at the time of stereo reproduction. Therefore, the same
effect as that of the first embodiment is obtained.
[0017]
[Modifications] The present invention is not limited to the above-described embodiment, for
example, the following modifications can be made (1) A plurality of speakers of different
frequency bands are disposed in one container 1 , And can be configured to send the output of
the summing circuit 25 to each. (2) Either or both of the volume adjusters 6, 7 and the balancer
resistors 8, 9 can be provided in the amplifiers 3, 4 or at this output stage. (3) Instead of
providing the hook switch 22 in the output jack 13, it is possible to provide an independently
operated switch. (4) The amplifiers 3 and 4 can be omitted, and the volume and balance
adjustment can be configured by a passive circuit. (5) The amplifiers 3 and 4 can also be made
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into tone control circuits. (6) As shown in FIG. 7, the first and second light emitting diodes D1
and D2 having different emission colors are connected between the power supply terminal 32
and the ground via the resistors R1 and R2, and the light emitting diodes D1 and D2 are
connected. While displaying the on / off state of the power, as well as displaying the R and L
channels of the stereo reproduction of FIG. In FIG. 7, the anode of the first light emitting diode
D1 is connected to the terminal 33 of the output jack 13 of stereo standard jack configuration,
the transistor Q1 is connected between the anode of the second light emitting diode D2 and the
ground, and this base is It is connected to the anode of the first light emitting diode D1 via a
resistor R3. When the monaural plug 26 is inserted into the stereo standard jack 13 of the first
device A in order to perform the same stereo reproduction as in FIG. 3, the terminal 33 is
connected to the ground, and the first light emitting diode D1 is in a non-emission state. The
transistor Q1 is switched off and the second light emitting diode D2 is turned on to indicate that
it is a stereo, for example R channel. On the second device B side, no plug is inserted into the
output jack 13 having the same configuration as that in FIG. 7 of FIG. 3, so the first light emitting
diode D1 emits light and the second light emitting diode D2 is extinguished. , L channel display.
The first and third light emitting diodes D1 and D3 have the same color, and the second and
fourth light emitting diodes D2 and D4 have the same color. The light emitting display circuit of
FIG. 7 can also be provided in the auxiliary input jack 12.
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