JPH0955801A - Long time sound recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record sound for a long time and to recognize which line of communication it is at the time of reproduction by recording only the sound of a sound line and simultaneously recording the line number as well. SOLUTION: Communication sound is digitized in an A/D converter 1 and compressed to extend recording time in a transcoder 2. When it is stored for four seconds in a digital memory 3, a controller 5 switches an input changeover switch 7 and records the sound line number of the output of silence detection 4 in a DAT 6. Also, the contents of the digital memory 3 of the line correspopding to the sound line number are recorded in the DAT 6. Since the communication sound is kept recorded in the digital memory of the other surface even during the recording, communication sound recording is performed without interruption. Thus, for instance, when sound recording object communication lines are 12 lines and only one line among them is sound, sound recording time to one tape becomes 12 times as long as conventional.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital recording capable of recording only a sound part of a voice obtained from a plurality of communication lines on a magnetic tape and recording on one magnetic tape for a long time. It relates to the device.

[0002]

2. Description of the Related Art In the case of recording the voices of a plurality of call lines on one magnetic tape, all the call lines are always recorded in the past, so that they are unused or there is no call, and there is no sound. Calls on the existing line were originally recorded on a magnetic tape, although it was not necessary to record them.
Therefore, even if there is a call only on one line or if there are calls on a plurality of lines, there is a problem that the recording can be performed on one tape for the same time.

[0003]

A call on a silent line is not recorded on a magnetic tape, but only a call on a voiced line is recorded on a magnetic tape.

[0004]

SUMMARY OF THE INVENTION A recording device according to the present invention is an A / D device for converting call voice into a digital signal for each line.
Converter, digital storage means for storing the digital signal output from the A / D converter, and sound / line for each line
A means for detecting silence and outputting a voiced line number as a digital signal, a controller for switching the digital signal to be sent to the magnetic tape storage device to a digital signal for a voiced line number and a digital signal for a call voice stored for each line, It includes a magnetic tape storage device for recording digital signals on a magnetic tape.

[0005]

[Operation] The voice of the telephone line is digitized and the digital data is temporarily stored. It is detected whether there is voice or no voice for each line, and the line number of voice and the voice of the line of voice are recorded on the magnetic tape. Since only the voice of the voiced line is recorded on the magnetic tape, the voice of the silent line can be recorded on one magnetic tape longer than when recorded on the magnetic tape. . Since the voiced line number is also recorded on the tape, when the recorded content of the magnetic tape is reproduced, it is possible to know which line the call was on.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration diagram of a long time recording apparatus according to one embodiment of the present invention. In FIG. 1, each block has the following functions.

The A / D converter (1) converts an audio input into digital data having an information amount of 64 Kbps by a PCM system having a sampling frequency of 8 KHz and a quantization number of 8 bits.

The transcoder (2) outputs the output of the A / D converter (1) to a sampling frequency of 8 KH.
z, quantized number: 4-bit ADPCM system 32 Kbp
It is compressed into digital data having an information amount of s.

The digital memory (3) has a storage capacity of 256 Kbits per line and 128 Kbits x 2
It can be used as a toggle buffer for a face and can store about 4 seconds of voice per face. If the two side digital memories are A memory and B memory, the output from the transcoder (2) is A → B → A → B → A → ...
In this way, they are alternately stored in the two-sided digital memory. While storing audio information in one digital memory, the contents of the other digital memory are referenced for recording on tape.

The silence detection (4) compares the 8-bit digital data output from the A / D converter (1) with the 8-bit digital data corresponding to the silence analog level as a threshold value. Sound / silence is determined. If the voice data is stored in the digital memory (3) for 4 seconds, and if it is determined to be voiced even once, the voice is recorded for 4 seconds and is recorded on the tape.

When the voice data is stored in the digital memory (3) for 4 seconds, the controller (5) switches the input selector switch (7) to a voiced line number obtained from the silence detection (4). Then, the digital memory (3) corresponding to the voiced line number is switched.

The DAT (6) is an input selector switch (7).
It is a magnetic tape storage device for recording a digital signal inputted from a magnetic tape.

The operation of the apparatus having the above configuration will be described. The call voice is digitized by the A / D converter (1), the information amount is further compressed by the transcoder (2), and stored in the digital memory. In this device, the recording time is further extended by the data compression by the transcoder (2). When the voice for 4 seconds is stored in the digital memory (3), the controller (5) switches the input selector switch (7) and DATs the voiced line number output by the silence detection (4).
The contents of the digital memory (3) of the line corresponding to the voiced line number are recorded in the DAT (6). DAT contents of digital memory (3)
While the call is recorded in (6), the call voice is continuously recorded in the digital memory on the other side, so that the call can be recorded without interruption.

[0014]

When the number of communication lines to be recorded is 12 and only one of them has a voice, the recording time on one tape is 12 times as long as the conventional technique.

[0015]

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a long-time recording apparatus according to an embodiment of the present invention.

Claims (1)

[Claims] 1. An A / D converter for converting a call voice into a digital signal for each line, a digital storage means for storing a digital signal output from the A / D converter, and a voice / sound detection for each line. Means to output the line number as a digital signal, the digital signal sent to the magnetic tape storage device to the digital signal of the voiced line number and the digital signal of the call voice stored for each line, the digital signal to the magnetic tape A long-time recording apparatus including a magnetic tape storage device for recording, characterized in that, when the storage information of the digital storage means is recorded in the magnetic tape device, only a voice call of a voiced line is recorded.