JPS5859655A - Loudspeaker telephone set provided with recording and reproducing functions - Google Patents

Abstract

PURPOSE:To reduce a difference in recording level between sending and receiving signals, by utilizing a microphone and a loudspeaker of a loudspeaker telephone set, and providing a control switch related to operation of the telephone set, in case of recording and reproducing of a call, in a loudspeaker telephone set provided with recording and reproducing functions. CONSTITUTION:In case of executing a loudspeaker call, a loudspeaker call switch 8 is operated, its contact 8-1 is closed, a contact 8-2 is also switched and is set to a recording mode side. A call signal is reproduced by a loudspeaker circuit 6 through a telephone line terminal 4 and a receiving amplifier 5, also is applied to a microphone circuit 1, and is outputted to a microphone output terminal 1-3. A user's voice is outputted to the line through a transmitting amplifier 2 from the microphone. When a recording and reproducing switch 9 is operated, a recorder and reproducer 7 becomes a recording mode when an electric current is supplied to a terminal 7-4, inputs a receiving signal and a sending signal from the microphone output terminal 1-3, and executes recording. When the switch 8 is reset, the recorder and reproducer 7 becomes a reproducing mode, and a signal output from a reproducing signal output terminal 7-1 is reproduced by a loudspeaker 6-1.

Description

[Detailed description of the invention] The present invention relates to a loudspeaker telephone with a recording and playback function.

Conventionally, a microphone was built into a public address telephone.

The speaker and amplifier circuit were used only for their intended purpose, loudspeaker communication, and no other use was considered. On the other hand, Yasugi said that he had recorded a telephone conversation, and by placing a commercially available tape recorder microphone between the loudspeaker telephone and the user, he recorded the incoming sound from the speaker of the loudspeaker telephone and the user. However, the level difference between the received voice and the user's voice varies greatly depending on the position of the tape recorder's microphone, making it difficult to make good recordings and inconvenient to operate. there were.

The present invention is configured to record a call by using a signal collected by a microphone of a loudspeaker telephone, and to use a speaker of the loudspeaker telephone for playback. The object of the present invention is to eliminate the above-mentioned drawbacks and to provide an economical loudspeaker telephone with a recording and reproducing function.

According to the present invention, there is provided a loudspeaker telephone with a recording and playback function, characterized in that the recording signal and the playback signal of the recording and playback device are transmitted and received between the output terminal of a microphone circuit for loudspeaker calls and the input terminal of a speaker circuit. It will be done.

Next, embodiments of the present invention will be explained with reference to the drawings. Fig. 1 is a block diagram of a first embodiment of the present invention, which includes a microphone l-1, a microphone amplifier l-2°, and an output terminal 1-3. Includes microphone circuit 1 and transmitting amplifier 2% side sound protection circuit 3
, the receiver amplifier 5, and the speaker 6-1. A speaker circuit 6. including a speaker amplifier 6-2 and an input terminal 6-3. A contact set 8-1 of the loudspeaker switch 8 is provided between the line terminal side of the side sound protection circuit 302 and the line terminal 4 of the telephone line. In addition, the recording and playback circuit is connected to the speaker circuit 66 input terminal 6-
3, and a recording signal input terminal 7-2 connected to the output terminal 1-3 of the microphone circuit 1. and playback mode control terminal 7-3. a recording/reproducing device 7 including a recording mode control terminal 7-4; a recording/reproducing switch 9 connected to a power supply lO; the recording/reproducing switch 9, the aforementioned reproduction mode control terminal 7-3, and the recording mode control terminal 7-4. and a contact set 8-2 of the loudspeaker switch 8 provided between the two.

Next, the operation of the above circuit will be explained. When making a loudspeaker call, the loudspeaker switch 8 operates, the contact group 8-1 closes, and the contact group 8-2 is the recording mode control terminal. -411. Therefore, the reception signal appearing at the line terminal 4 is applied to the speaker circuit 6 via the contact set 8-1, the side sound protection circuit 3, the reception amplifier 5, and the reception signal is reproduced from the speaker 6-1.

This signal is heard by the user, is also applied to the microphone 1-1 of the microphone circuit 1, and is output to the output terminal 1-3 of the microphone circuit 1. In addition, the user's voice signal is applied to the microphone 1-1, and is output to the output terminal l-3 of the microphone circuit l, and the contact set 8- of the transmitting amplifier and the side sound protection circuit 3% loudspeaker switch 8. 1t
The signal is then outputted to the line terminal 4 and transmitted to the other party, thereby carrying out a loudspeaker call.

At this time, when the recording/playback switch 91 is activated, power is supplied from the power supply lO to the recording mode control terminal 7-4 of the recording/playback device 7, and the recording/playback device 7 enters the recording mode 9. The above-mentioned received signal and transmitted signal are peeked through the output terminal 1-3 of the microphone circuit 1 and are recorded. Generally speaking, in a public address telephone, the level of the received signal coupled from the speaker 6-1 to the microphone 1-1 is designed to be approximately the same as the level of the user's voice signal, so the level difference between the transmitted signal and the received signal is It becomes possible to record without any excess.

Next, return the loudspeaker switch 8 and operate the recording/playback switch 9.
When power is supplied to the recording/player 7, it enters the playback mode.9, the playback signal output terminal ? -1 to speaker circuit 60 input terminal 6
A playback signal is added to -3 and played back from the speaker 6-1.

FIG. 2 is a block diagram of the @2 embodiment of the present invention, showing the playback signal output terminal of the recording/playback iS7. -1 to the input terminal 6 of the speaker circuit 6 via the contact set 8-2 of the loudspeaker switch 8.
-3 and the output terminal 1-3 of the microphone circuit 1,
The configuration is such that power is supplied to the playback mode control terminal 7-3 via the playback switch lle, and the recording mode control terminal 7-4
The configuration is such that power is supplied to the recording switch 12 through the recording switch 12.

Next, the operation of the above circuit will be explained. When the recording switch 12 is activated, the recording/reproducing device 7 enters the recording mode and operates to receive the output signal from the output terminals 1-3 of the microphone circuit 1, and the loudspeaker switch 8t is activated. If not, the user's voice signal applied from the microphone 1-1 is recorded. Next, when the loudspeaker switch 8 is activated.

Amplified telephone calls become possible, and as explained in FIG. 1, the received signal and the transmitted signal are recorded.

Next, when the recording switch 12 is restored and the playback switch 11 is operated, the recording/playback device 7 company playback mode is entered, and a playback signal is output from the % playback signal output terminal 7-1, and the color speaker call switch 8t is not activated. - and sleep are contact group 8
-2 to the input terminal 6-3 of the speaker circuit 60, and is reproduced more often than the speaker 6-1. At this time, when the loudspeaker switch 8t is activated, the contact set 8-2 is switched to the output terminal 1-3 side of the microphone circuit 1, and the reproduction signal transmission amplifier 2% side sound protection circuit 3. The message is sent to the other party at the loudspeaker switch 8.

By adopting the configuration described above, the present invention is more economical and easier to operate than a system in which a loudspeaker telephone and a recording/reproducing device are provided independently, and has a recording/reproducing function with less difference in the recording level of transmitted and received signals. A public address telephone is available.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a first embodiment of the present invention, and a block diagram of a second embodiment of the present invention. l...Microphone circuit, 1-1...
Microphone;/, 1-2...--Microphone amplifier, l
-3... Output terminal, 2... Transmitting amplifier, 3... Side sound protection circuit, 4... Line terminal, 5...・Receiving amplifier, 6...-Speaker circuit% 6-1...Speaker, 6-2...
...Speaker amplifier, 7...Recording and playback device, 7-
1...Reproduction signal output terminal, 7-2...-
Recording signal input terminal, 7-3... Playback mode control terminal, 7-4... Recording mode control terminal,
... Public address call switch, 9 ... Garlic re-switch, 10 ... Power supply % 11 ... - Recording switch % 12 ... Playback switch.

Claims (3)

[Claims] (1) A loudspeaker telephone with a recording and playback function, characterized in that it is configured to send and receive recording signals and playback signals of a recording and playback device through the output terminal of a microphone circuit for loudspeaker calls and the input terminal of a speaker circuit. (2) It is configured to receive the recording signal of the recording/playback device from the output terminal of the microphone circuit, and transmit the playback signal of the recording/playback device from the input terminal of the speaker circuit, and controls such as turning on the power of the recording/playback device. A patent claim characterized in that the switch is configured to be controlled to record mode when the talt switch and the loudspeaker switch are actuated, and to be controlled to playback mode when only the previous recording switch is actuated. A loudspeaker telephone with a recording and playback function as described in paragraph (1). (3) The recording signal of the recording/reproducing device is received from the output terminal of the microphone circuit, and the reproduction signal of the recording/reproducing device is transmitted to the speaker circuit by the switching contact set of the loudspeaker switch when the loudspeaker switch is not activated. a recording switch configured to transmit the signal to the input terminal of the microphone circuit, and to transmit the signal to the output terminal of the microphone circuit when the loudspeaker switch is activated, and to control the recording and reproducing device to a recording mode; Set up a playback switch to control the mode.