JPS6040967Y2 - dictation playback machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dictation recording and reproducing machine, and more particularly to a dictation recording and reproducing machine that enters the recording state only when there is a voice input.

In order to extend the lifespan of recording tapes and batteries, there are so-called conversation telecos (recording/playback machines) that enter the recording state only while voice input is coming, but they detect voice input and change from the standby state to the recording state. The migration method is generally adopted.

With such a device, the conversation is already in progress by the time recording becomes possible, so the initial part of the conversation remains unrecorded. is extremely difficult to hear.

Accordingly, an object of the present invention is to provide a dictation recording/reproducing machine which can obtain good reproduced sound except for recording interruptions at the beginning of each conversation.

The dictation recording/playback device of the present invention delays the audio input signal by a delay means for a certain period of time, and controls the recording state during the period when at least one of the delayed output signal and the audio input signal is present, The device is characterized in that this delayed output signal is supplied to the recording head.

The present invention will be explained below with reference to the drawings.

The figure is a block diagram showing an embodiment of the present invention. Reference numeral 1 denotes an audio microphone (hereinafter referred to as a microphone), and the output of this microphone is applied to a rectifying and smoothing circuit 2, where it is converted into a DC signal, and an OR gate 3 is applied. It is a one-person operation.

The microphone output is further amplified by the audio amplifier 4 and input to the delay circuit 5, delayed by a predetermined time, and applied to the rectifying and smoothing circuit 6, where it becomes a DC signal and becomes another input to the OR gate 3.

The output of the OR gate 3 is applied to a motor control circuit 7 to control a tape and capstan driving motor 8.

The delayed output signal of the delay circuit 5 is applied to the power amplifier 9 and supplied to the recording head 10.

It is necessary to use an analog delay circuit as the delay circuit 5, and for example, a BBD (packet brigate device) element having an inexpensive and small structure is used.

Therefore, a clock signal generator 11 for driving the BBD is provided, and by varying the frequency of this clock signal, a desired delay time can be selected.

With this configuration, when an audio signal is applied from the microphone 1 to the rectifying and smoothing circuit 2, a signal having a DC level corresponding to the audio signal immediately passes through the OR gate 3 and triggers the motor control circuit 7.

Therefore, the motor 8 starts rotating and the device is controlled from a standby state to a recording state.

Since the output of the BBD 5 is generated after a predetermined time delay from the generation of the audio signal, if this is supplied to the head 10,
Since the device has already entered the recording state completely, the beginning of the input signal is prevented from being unrecorded.

When the audio signal disappears, the output of the smoothing circuit 2 disappears, but while the delayed output of the BBD 5 is present, a DC output is generated from the rectifying and smoothing circuit 6. continues to be activated.

Therefore, it is convenient to maintain the recording state while the delayed audio signal is being supplied to the head 10.

In the above description, a BBD is used as the delay element to reduce the size and weight of the circuit, but it goes without saying that other analog delay elements may be used.

As described above, according to the present invention, since there is no interruption at the beginning of a conversation, faithful recording and reproduction is possible, and a good dictation recording and reproducing machine can be obtained.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of the present invention. Explanation of the symbols of the main parts, 2, 6... Rectification and smoothing circuit, 5... Delay circuit, 7... Motor control circuit, 10... Recording head .

Claims (1)

[Scope of utility model registration request] a delay means for delaying an audio input signal for a predetermined time; and a recording control means for controlling a recording state for a period during which at least one of the audio input signal and the delayed output signal of the delay means exists, A dictation playback machine that supplies delayed output to a recording head.