JPH0737439Y2 - Compound audio equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite audio device generally called a speaker with a built-in amplifier.

[0002]

2. Description of the Related Art A typical conventional speaker with a built-in amplifier is constructed by housing a speaker 2, an amplifier (amplifier) 3 and a volume controller (volume) VR in a box-shaped container 1 as shown in FIG. It is configured.

[0003]

By the way, when a stereo system is formed by using two speakers with a built-in amplifier shown in FIG. 1, the left and right channel volume must be operated independently, which is not easy to operate. . It is possible to manufacture a speaker with a built-in amplifier for stereo, in which a speaker and amplifiers for both left and right channels are built in one box, but if there is not so much demand for equipment in the market, a speaker with a built-in amplifier for monaural and a speaker for stereo If both the speaker with a built-in amplifier is manufactured, the mass productivity is lowered and the cost is inevitably increased.

Therefore, an object of the present invention is to provide a composite audio apparatus which can be used for both monaural reproduction and stereo reproduction, and has good operability when used for stereo reproduction.

[0005]

The present invention for achieving the above object comprises a container, a speaker attached to the container, and first, second and third input terminals attached to the container. 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 terminal The connected first signal line, the second signal line for selectively transmitting the output of the second amplifier, and the output signal of the second amplifier when the monaural reproduction is performed, Line, and a switch for blocking transmission of the output signal of the second amplifier by the second signal line during stereo reproduction, a third signal line connected to the third input terminal, and the third signal line. 1 output signal of the amplifier and the signal of the second signal line An adder circuit for sending to the speaker by adding the signal of the serial third signal line, said first and second
Of the amplifier, the first and second volume adjusters provided integrally with the input side or the output side, and common operating means for operating the first and second volume adjusters in conjunction with each other. It is related to the device. The third input terminal can be omitted as shown in claim 2.

[0006]

In the case of monaural reproduction using the composite audio device of the present invention, the signal source device is connected to either 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 first of the composite audio devices of one is prepared.
And the second input terminals to which the signal sources of the first and second channels are connected, and the output terminal of one of the devices is connected to the third input of the other device.
And the switch is operated so as to disconnect the second signal line of one of the devices from the second amplifier while being connected to the input terminal of. With such a configuration of the stereo system, the volume of the first and second channels can be adjusted at the same time by operating the common operating means of one of the devices, which improves usability. Further, since it is not necessary to manufacture a device dedicated to stereo reproduction, it is possible to flexibly meet 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 during stereo reproduction, and the volume of the other device is set to the maximum. As a result, the same effect as that of the first aspect can be obtained.

[0007]

[First Embodiment] Next, a composite audio apparatus including an amplifier and a speaker according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 2, this composite audio device includes a speaker 2, a first and second amplifiers 3 and 4, and an output amplifier 5 in a box-shaped container 1.
And the first and second volume adjusters (volumes) 6 and 7,
The first and second balancer resistors 8 and 9 are accommodated, and further, the first, second and third input connection means,
It is configured by providing second and third input jacks 10, 11, 12 and an output jack 13 as an output connecting means.

The first input jack 10 has a first input terminal 14 and a ground terminal 15, the second input jack 11 has a second input terminal 16 and a ground terminal 17, and a third 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 2 of a normally closed configuration.
2 and.

The first input terminal 14 of the first input jack 10 is connected via the first volume adjuster 6, the first balancer resistor 8, the first amplifier 3, the adding 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 connected to the second volume adjuster 7 and the second volume adjuster 7.
Balancer resistor 9, second amplifier 4, and first signal line L1
Is connected to the output terminal 20 of the output jack 13 via the hook switch 22, the second signal line L2 of the output jack 13, the adder circuit 25, and the output amplifier 5 and is connected to the speaker 2. The third input terminal 18 of the third input jack 12 is connected to the speaker 2 via the third signal line L3, 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 terminal of the speaker 2 are commonly connected.

A knob 23 as an interlocking operation means for the first and second volume adjusters 6, 7 and a knob 24 as an interlocking operation means for the first and second balancer resistors 8, 9 are provided outside the container 1. It is arranged.

When the composite audio apparatus of FIG. 2 is used for monaural reproduction, the first and second input jacks 10,
An audio signal source is connected to one or both of the first and second input terminals 14 and 16 of 11 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 controller 6, the first balancer resistor 8, the first amplifier 3, and the adder circuit 25. The signal is sent to the speaker 2 via the output amplifier 5 and the output amplifier 5. If the 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 connected. Signal line L1 of 1 and hook switch 2 of output jack 13
A signal is sent to the speaker 2 through the second signal line L2, the second signal line L2, the adding 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 adder circuit 25 and output. The mixed sound of the left and right channels is obtained from the speaker 2 by being sent to the amplifier 5.

For stereo reproduction, two composite audio devices A and B having the same structure 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. The third input jack 12 is connected by a connection cord 28 having plugs 26 and 27. That is, the first device A
The output terminal 20 of the output jack 13 and the input terminal 18 of the third input jack 12 of the second device B are connected, and the ground terminals 21 and 19 are also connected to each other. Plug 26
Is inserted in the output jack 13 of the first device A, the hook switch 22 is turned off, and the second amplifier 4 and the second signal line L2 in the first device A are disconnected.
The left and right channel audio signal sources are the first device A's first
And second input terminals 14 and 16. As a result, the signal of the left channel is output to the speaker via the input terminal 14 of the first device A, the first volume controller 6, the first balancer resistor 8, the first amplifier 3, the adding circuit 25, and the output amplifier 5. 2, the right channel signal is sent to the input terminal 16 of the first device A, the second volume controller 7, and the second balancer resistor 9.
A speaker through the second amplifier 4, the first signal line L1, the output terminal 20, the connection cord 28, the input terminal 18 of the second device B, the third signal line L3, the adding circuit 25 and the output amplifier 5. Sent to 2. During this stereo reproduction, the volume of both channels can be adjusted by one operation knob 23 of the device A, and the left and right balance can be adjusted by one operation knob 24 of the device A. Therefore, the first of the same configuration
The operability is excellent even though the stereo reproduction system is configured by the second devices A and B.

FIG. 6 shows a stereo reproduction system having a simple 2-channel stereo mixer function. This method is the first
In order to perform mixed reproduction of the stereo signal and the second stereo signal, the output jack 13 of the first device A is connected to the third input jack 12 of the second device B by a cord 28 having plugs 26 and 27. Connected and the third of the first device A
Input jack 12 and output jack 13 of the second device B
Are connected with a cord 31 having 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, 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. As a result, 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 sent.
The channel signal is the second input jack 11 of the first device A.
And a second device B through a path including the output jack 13, the cord 28, and the third input jack 12 of the second device B.
Sent to speaker 2. In addition, the R channel signal of the second stereo signal is input to the second channel 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. 1 to the speaker 2 of the device A, and the L channel signal of the second stereo signal is transmitted to the first input jack 1 of the second device B.
It is sent from 0 to this speaker 2. As a result, the mixed output of the R channel signals of the first and second stereo signals is obtained from the speaker 2 of the first device A, and the second device B is obtained.
From the speaker 2 of the first and second stereo signals L
A mixed output of channel signals is obtained.

[0014]

[Second Embodiment] Next, a second embodiment shown in FIGS. 4 and 5 will be described. However, in FIGS. 4 and 5, the same parts as those in FIGS. 2 and 3 are designated by the same reference numerals, and the description thereof will be omitted. The composite audio device of the second embodiment of FIG.
From the composite audio device of FIG. 2 to the third input jack 12
The configuration is the same as that of FIG. When monaural reproduction is performed by the apparatus of FIG. 4, it is used as in the case of FIG.

When stereo reproduction is performed by using the two devices of FIG. 4, the connections are made 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. Also, the second
The first volume adjuster 6 of the device B is set to the maximum volume, and the first balancer resistor 8 is set to the maximum share. The first and second input jacks 10 of the first device A,
When the left and right channel signals are input to 11, the left channel signal is sent to the speaker of the first device A through the same path as in the case of FIG. The signal of the right channel is sent to the output jack 13 of the first device A as in FIG.
Input to the first input jack 10 of the device B, and then sent to the speaker 2 of the second device B.

Also according to the second embodiment, it is possible to simultaneously adjust both channels by the operation knobs 23 and 24 of the first apparatus A during stereo reproduction. Therefore, it has the same effect as that of the first embodiment.

[0017]

[Modification] The present invention is not limited to the above-mentioned embodiment, and the following modifications are possible. (1) It is possible to arrange a plurality of speakers having different frequency bands in one container 1 and send the output of the adder circuit 25 to each. (2) Either or both of the volume adjusters 6 and 7 and the balancer resistors 8 and 9 can be provided in the amplifiers 3 and 4 or in this output stage. (3) Instead of providing the hook switch 22 on the output jack 13, a switch that can be operated independently can be provided. (4) The amplifiers 3 and 4 can be omitted, and the volume / balance adjustment can be configured by a passive circuit. (5) The amplifiers 3 and 4 can be a ton control circuit. (6) As shown in FIG. 7, first and second light emitting diodes D1 and D2 having different emission colors are connected between the power supply terminal 32 and the ground through resistors R1 and R2, and the light emitting diodes D1 and D2 are connected. Can be used to display the power on / off and display of 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 the stereo standard jack configuration, and the transistor Q1 is connected between the anode of the second light emitting diode D2 and the ground. 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 for the same stereo reproduction as in FIG. 3, the terminal 33 is connected to the ground and the first light emitting diode D
1 becomes a non-emission state, the transistor Q1 is turned off, and the second light emitting diode D2 is turned on to indicate that the channel is stereo, for example, the R channel. On the side of the second device B, since the plug is not inserted into the output jack 13 having the same configuration as in FIG. 7 of FIG. 3, the first light emitting diode D1
Emits light, the second light emitting diode D2 goes out, and the L channel is displayed. 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 be provided in the auxiliary input jack 12.

[Brief description of drawings]

FIG. 1 is a block diagram showing a conventional speaker with a built-in amplifier.

FIG. 2 is a block diagram showing a composite audio device of a first embodiment of the present invention.

FIG. 3 is a block diagram showing a stereo system using two composite audio devices of FIG.

FIG. 4 is a block diagram showing a composite audio device of a second embodiment.

5 is a block diagram showing a stereo system using two composite audio devices of FIG.

FIG. 6 is a block diagram showing another stereo reproduction system using two composite audio apparatuses of FIG.

FIG. 7 is a circuit diagram showing a display device.

[Explanation of symbols]

 2 Speakers 3, 4 Amplifiers 10, 11, 12 Input jacks 13 Output jacks

Claims (2)

[Scope of utility model registration request] 1. A container, a speaker attached to the container, first, second, and third input terminals attached to the container, output terminals attached to the container, and the first and second terminals. A first and a second amplifier connected to a second input terminal and housed in the container, and a first connecting the second amplifier and the output terminal.
Signal line and a second line for selectively transmitting the output of the second amplifier.
And a signal line for transmitting the output signal of the second amplifier through the second signal line during monaural reproduction, and interrupting the transmission of the output signal for the second amplifier through the second signal line during stereo reproduction. A switch, a third signal line connected to the third input terminal, an output signal of the first amplifier, a signal of the second signal line, and a signal of the third signal line are added. And an output circuit of the first and second amplifiers, or first and second volume adjusters provided integrally with the input side or the output side of the first and second amplifiers, and the first and second volume levels. A composite audio device equipped with common operating means for interlocking the adjuster. 2. A container, a speaker attached to the container, first and second input connection means attached to the container, an output terminal attached to the container, and the first and second A first and a second amplifier connected to the input terminal of the first housing and housed in the container, and a first connecting the second amplifier and the output terminal.
Signal line and a second line for selectively transmitting the output of the second amplifier.
And a signal line for transmitting the output signal of the second amplifier through the second signal line during monaural reproduction, and interrupting the transmission of the output signal for the second amplifier through the second signal line during stereo reproduction. A switch; an adder circuit for adding the output signal of the first amplifier and the signal of the second signal line to send to the speaker; and an input side or an output side of the first and second amplifiers or this. A composite audio device comprising: first and second volume adjusters integrally provided; and common operating means for interlocking operation of the first and second volume adjusters.