JPH0879367A - Recording / playback device - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to efficiently use a recording / playback data memory for recording / playback of voice in a wireless telephone device. A voice codec for a wireless telephone device 6 compresses a transmission PCM signal 4 from a PCM codec 3 and transmits it to a modem 11 during transmission. At the time of reception, the received voice coded signal 10 from the modem 11 is decompressed and transferred to the PCM codec 3 as a received PCM signal 5.
On the transmitting side, the voice encoded data 7 after signal compression is stored in the data memory 8. On the receiving side, the voice encoded data 7 before the signal expansion is stored in the data memory 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for converting an analog voice signal into a digital signal by the ADPCM system in a radio telephone device, storing the data in a memory, and recording / reproducing a voice during transmission / reception.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a recording / reproducing apparatus of this kind converts an analog voice signal transmitted / received into a digital signal of 32 KBPS by an ADPCM device 101, stores the data in a memory 102, and records a voice. It was configured to be playable. In the figure, 103 is a microphone and 104 is a speaker.

[0003]

However, in the above-mentioned conventional recording / reproducing apparatus, the ADPCM device 101 is 32K.
Since it is a BPS (8 KHz sampling, 4 bit quantization) digital signal conversion, a value obtained by the product of the recording time and 32 KBPS is necessary as the recording memory capacity.
Therefore, you have to increase the memory capacity,
Moreover, efficient use of memory was not sufficient. In consideration of the above-mentioned conventional problems, the present invention uses the same recording time as the conventional recording time.
It is an object of the present invention to provide an excellent recording / reproducing device which can be filled with a memory capacity of one-tenth or less and can efficiently use the memory.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a transmission P from a PCM codec during transmission.
When the CM signal is compressed and transferred to the modem and received, the received voice coded signal from the modem is expanded and received PCM
A voice codec for transferring to a PCM codec as a signal and a memory for storing voice coded data obtained by the voice codec are provided. On the transmitting side, the voice coded data after signal compression is stored in the memory for reception. On the side, a recording / playback device is configured to store the voice coded data before signal decompression in a memory.

[0005]

Therefore, according to the present invention, the 7.466 KBPS voice coded data obtained by the voice codec can be stored in the memory, and the recording time and the 7.466 KBP can be stored.
The value obtained by the product of S and S can be satisfied as the recording memory capacity.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of a recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 6 denotes a voice codec, which is a transmission PCM from the PCM codec 3 at the time of transmission
The signal (64 KBPS) 4 is compressed and transferred to the modem 11, and at the time of reception, reception voice encoding / decoding from the modem 11 1
0 is signal-decompressed and transferred to the PCM codec 3 as a received PCM signal (64 KBPS) 5, the coded voice coded data 7 is transferred to the memory 8 at the time of transmission, and the voice coded data 7 before signal decompression at the time of reception is transferred. It has a function of transferring to the memory 8. The memory 8 is a voice codec 6
It has a function to store the data transferred from. In the figure, 1 is a microphone and 2 is a speaker.

Next, the operation of the above embodiment will be described. In the above embodiment, at the time of transmission, the voice codec 6 is connected to the PC.
Transmission PCM signal from M codec 3 (64 KBPS)
4 is signal-compressed and 7.466 KBPS speech coded data 7
Is transferred to the memory 8. At the time of reception, the voice codec 6 decompresses the received voice coded signal 10 from the modem 11 to generate a received PCM signal (64 KBPS) 5 as a PC.
It is transferred to the M codec 3, but 7.466 before this expansion
The KBPS speech coded data 7 is transferred to the memory 8, and this data is stored in the memory 8.

As described above, according to the above embodiment, the value obtained by the product of the recording time and 7.466 KBPS can be satisfied as the recording memory capacity, and the conventional ADPCM
Compared with storing 32 KBPS (8 KHz sampling, 4 bit quantization) voice coded data by the method, the same recording time can be satisfied with a memory capacity of 1/4 or less,
It has an advantage that the memory can be efficiently used.

[0009]

As is apparent from the above description of the embodiments of the present invention, 7.466 KB transferred from the voice codec is transmitted.
It is a device that stores the PS voice coded data in the memory and tries to record and reproduce the data, and the recording time and 7.466 KBP.
The value obtained by the product with S can be satisfied as the recording memory capacity, and 32 KBP according to the conventional ADPCM method is used.
Compared with the storage of voice coded data of S (8 KHz sampling, 4 bit quantization), the same recording time can be satisfied with a memory capacity of 1/4 or less, and efficient use of memory can be performed. It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a block diagram of a recording / playback apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional recording / playback device.

[Explanation of symbols]

 1 Microphone 2 Speaker 3 PCM Codec 4 Transmitted PCM Signal (64 KBPS) 5 Received PCM Signal (64 KBPS) 6 Voice Codec 7 7 4.466 KBPS Voice Coded Data 8 Memory 9 Transmit Voice Coded Signal 10 Received Voice Coded Signal 11 Modem

Claims (1)

[Claims] 1. In recording and reproducing voice of a wireless telephone device, when transmitting, a transmission PCM signal from a PCM codec is signal-compressed and transferred to a modem, and when receiving, a reception voice coded signal from the modem is expanded. A recording / reproducing apparatus including a voice codec for transmitting a received PCM signal to a PCM codec and a memory for storing voice coded data obtained by the voice codec.