JPH0333923Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a recording/playback input/output switching circuit for a headphone stereo equipped with at least two input/output jacks.

<Prior Art> In a conventional headphone stereo equipped with two input/output jacks, these input/output jacks can be used effectively to transmit two signals via the headphone stereo without being disturbed by noise or the like.
It would be very convenient if you could have a conversation with someone.

<Purpose> The object of the present invention is to provide a recording/playback input/output switching circuit that makes effective use of these jacks in a headphone stereo equipped with at least two input/output jacks and enables conversation.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing one channel of an embodiment of the present invention. 1 is a magnetic head for both recording and reproduction, 2 is a preamplifier, 3 is a main amplifier, 4 is a recording amplifier, and 5 and 6 are input/output jacks. Reference numeral 7 denotes a recording/playback selector switch, which has a common contact 8 connected to the recording/playback magnetic head 1, and individual contacts 9, 1 placed between the common contact 8.
has 0. The movable terminal 11 of this recording/playback switch 7 is connected between the individual contact 10 and the common contact 8.
Recording and playback can be switched by sliding between the common contact 8 and the individual contact 9. A recording adjustment resistor 1 is connected between the connection between the preamplifier 2 and the main amplifier 3 and the connection between the individual contact 10 and the recording amplifier 4.
2 is connected.

The recording/playback input/output switching circuit 13 shown by the phantom line according to the present invention includes two input/output switching switches 14 and 15 in this embodiment as one or more input/output switching switches. One input/output changeover switch 14 has an individual contact 16 as a first switching means and an individual contact 17 as a second switching means.
and a common contact 18 connected to the recording amplifier 4, and the other input/output switch 15 has a third input/output switch 15.
It has an individual contact 19 as a switching means, an individual contact 20 as a fourth switching means, and a common contact 21 connected to the main amplifier 3. The movable terminals 22, 23 of the input/output switches 14, 15 are integrally slid and displaced in the same direction by the switching operation.

The individual contact 20 is connected to the individual contact 17 and the individual contact 19.
are connected to individual contacts 16, respectively. The individual contacts 16 are connected to one input/output jack 5,
The individual contacts 17 are connected to the other input/output jack 6. The input/output jacks 5 and 6 are equipped with a small phone 2 that can also be used as a microphone as shown in FIG.
4 or a headphone 26 having a switch for turning only the microphone 25 on and off is inserted and connected.

The operation will be explained below. As shown in FIG. 1, each movable terminal 2 of an input/output changeover switch 14, 15 as one or more input/output changeover switches.
In the first switching state where 2 and 23 are on the individual contacts 16 and 20 side, one input/output switch 1
4 connects one input/output jack 5 to the input side of the recording amplifier 4, and the other input/output switch 15 connects the other input/output jack 6 to the output side of the recording amplifier 4 via a resistor. 12 and the main amplifier 3, and in this first switching state:
One input/output jack 5 serves as the input side, and the other input/output jack 6 serves as the output side. At this time, the movable terminal 11 of the recording/playback switch 7 is slid to the individual contact 10 side to enter the recording state, and the small phone 2 inserted and connected to one of the input/output jacks 5
4 or into the microphone 25 of the headphone 26, the content of the speech is recorded and output as a recording monitor to the other input/output jack 6. In addition, input/output switch 1
When the movable terminals 22 and 23 of 4 and 15 are switched and slid toward the individual contacts 17 and 19, a second switching state is reached, and in this second switching state,
One input/output switch 14 connects the other input/output jack 6 to the input side of the recording amplifier 4, and the other input/output switch 15 connects the other input/output jack 5 to the recording amplifier 4. connected to the output side of the circuit via the resistor 12 and the main amplifier 3,
At this time, the input/output jack 5 becomes the output side, and the input/output jack 6 becomes the input side. At this time, the contents of the speech are recorded on the input/output jack 6 side, and are output as a recording monitor on the input/output jack 5 side. In this way, the people on the input/output jacks 5 and 6 can have a conversation via the headphone stereo. In the above case, the conversation is recorded because it is in the recording state, but a mute switch may be provided between the connection point 27 and the individual contact 10 in FIG. 1 and operated to disable recording, or the pause state You can also set it so that recording is not possible.

In this way, in the recording/playback input/output switching circuit 13 according to the present invention, for example, one of the input/output jacks 5
The person on the other side becomes the speaker, and the first electrical signal corresponding to the content of the communication is applied to the amplifiers 4 and 3 via the individual contacts 16 as the first switching means, where it is amplified. One electric signal is applied to the other input/output jack 6 via an individual contact 20 as a fourth switching means. Furthermore, by switching the input/output switch 14, 15, the person on the other side of the input/output jack 6 becomes the speaker, and the second electric signal corresponding to the content of the communication is transmitted to the second switching means. The second electric signal is applied to the amplifiers 4 and 3 via the individual contact 17 and amplified, and the amplified second electric signal is applied to one of the input/output jacks 5 via the individual contact 19 serving as a third switching means. Therefore, the person on the input/output jacks 5, 6 can have a conversation via the headphone stereo without being disturbed by external noise, for example. Furthermore, the recording/playback input/output switching circuit 13 according to the present invention has many functions such as the recording monitor, the input/output jacks 5 and 6 alternately recording, and monitoring of surrounding sounds during recording, as described above. The input/output jacks 5 and 6 are effectively used.

FIG. 4 is a single-channel circuit diagram of another embodiment of the present invention, which is similar to the previous embodiment and corresponding parts have the same reference numerals. The recording/playback input/output switching circuit 28 shown by the virtual line in this embodiment is one or more input/output switching switches, and in this embodiment, two input/output switching switches 29, 30.
Furthermore, a changeover switch 31 is provided. The input/output changeover switch 29 is provided on the output side of the main amplifier 3, and has an individual contact 19 as a third switching means and a fourth
It has an individual contact 20 as a switching means and an individual contact 32 connected to one input/output jack 5. The input/output switch 30 is provided on the input side of the recording amplifier 4, and has an individual contact 16 as a first switching means and an individual contact 1 as a second switching means.
7 and an individual (empty) contact 33. The changeover switch 31 has an individual contact 34 connected to the other input/output jack 6, and individual (empty) contacts 35, 36.
and has. The input/output changeover switches 29, 30 and the changeover switch 31 have individual contacts 19, 17, 3.
5. It is configured to be switched in conjunction with the three positions of the individual contacts 32, 33, and 34 or the individual contacts 20, 16, and 36.

In the first switching state in which the input/output changeover switches 29, 30 and changeover switch 31 are at the individual contacts 20, 16, 36, one input/output changeover switch 30 connects one input/output jack 5 to the recording amplifier. The other input/output switch 29 connects the other input/output jack 6 to the output side of the recording amplifier 4 via the resistor 12 and the main amplifier 3. One input/output jack 5 serves as the input side, and the other input/output jack 6 serves as the output side.

In the second switching state in which the input/output changeover switches 29, 30 and changeover switch 31 are at the individual contacts 19, 17, 35, one input/output changeover switch 30 switches the other input/output jack 6 to the recording amplifier. 4, and the other input/output switch 29 connects one input/output jack 5 to the output side of the recording amplifier 4 via the resistor 12 and the main amplifier 3. At this time, One input/output jack 5 serves as the output side, and the other input/output jack 6 serves as the input side.

In the first and second switching states, conversation and other functions can be performed as in the previous embodiment.

In this embodiment, input/output switch 2
9, 30 and the changeover switch 31 are the individual contacts 3
2, 33, and 34, both input/output jacks 5 and 6 are connected to the main amplifier 3, so slide the movable terminal 11 of the recording/playback switch 7 toward the individual contact 17 as shown in FIG. If you leave it in the playback mode, the input/output jacks 5 and 6
This makes it possible for people to listen to the reproduced sound together. The other configurations are similar to those of the previous embodiment.

In the above embodiment, there were two input/output jacks, but the present invention is not limited to two, and may be implemented in connection with a headphone stereo having two or more input/output jacks. good.

In the embodiment described above, the changeover switches 14, 15;
Although both 29 and 30 have a mechanical structure, they may have an electronic structure using a switching transistor or the like as another embodiment of the present invention.

<Effects> As described above, according to the present invention, at least two input/output changeover switches are provided to switch at least two input/output jacks to the transmitting side and the receiving side. It is possible to have a conversation through the headphone stereo without being affected by noise, and the input/output jack can be used effectively.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing one channel of an embodiment of the present invention, Fig. 2 is a perspective view of a petit phone used in connection with the present invention, and Fig. 3 is a headphone used in connection with the present invention. FIG. 4 is a circuit diagram showing one channel of another embodiment of the present invention. 1... Magnetic head for both recording and playback, 2... Preamplifier, 3... Main amplifier, 4... Recording amplifier,
5, 6... Input/output jack, 14, 15, 2
9, 30...Input/output switch.

Claims (1)

[Claims for Utility Model Registration] In a recording/playback input/output switching circuit for a headphone stereo equipped with at least two input/output jacks, at least the first and second switching states are achieved by performing switching operations in conjunction with each other. at least two input/output switching switches, one input/output switching switch connects one input/output jack to the input side of the amplifier in the first switching state, and in the second switching state, The other input/output jack is connected to the input side of the amplifier, and the other input/output switch connects the output side of the amplifier to the other input/output jack in the first switching state. In the recording/playback input/output switching circuit, the output side of the amplifier is connected to the one input/output jack in the second switching state.