JPH11103345A - Voice storage method and voice storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the deterioration of voice quality by storing a PCM voice consisting of a voice message from a mobile terminal to the voice storage system and repeating voice coding/voice decoding in the case of reproducing the message. SOLUTION: In the case that a called party is the voice storage system, voice coding/decoding controllers 8, 12 are used to stop voice coding and decoding devices 7, 11 provided to a mobile exchange 6 and the voice storage system 10, and a mobile terminal 1 stores the voice coding packet by a PCM voice resulting from voice-coding at the mobile terminal 1 is stored as it is to the voice storage system. In the case of reproduction, the voice coding packet stored in the voice storage system is sent as it is to a mobile terminal and the mobile terminal applies voice decoding to the packet so as to conduct voice coding/ voice decoding only once.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice storage method capable of temporarily storing a voice message from a mobile terminal in a mobile communication system and transferring and reproducing the voice message, and a voice storage using the voice storage device. About the system.

[0002]

2. Description of the Related Art A voice message of a calling party is stored in a voice mail device when a called terminal is busy or absent, and a voice message stored by operating the called party when the called party becomes free. A voice storage service called so-called voice mail, in which a voice message is transferred to a called terminal, is conventionally known. The voice storage service provided by such a voice mail device is capable of communication when the mobile terminal is within the communication range of the radio base station, but cannot be communicated outside the communication range. Used for storing voice messages at certain times.

For example, Japanese Patent Application Laid-Open No. Hei 5-284224 discloses a voice mail apparatus capable of storing voice messages, and a radio telephone (mobile terminal) is accommodated in a base station having a predetermined communication area (communication area). A system is disclosed. In this conventional device, when the wireless telephone is out of the communication range of the base station, the incoming call to the wireless telephone is automatically connected to the voice mail device to perform the alternate reception, and the wireless telephone is in the communication range. It is configured to be able to reproduce the message stored in the voice mail device when it enters.

Japanese Patent Laid-Open Publication No. Hei 6-284206 discloses that when an exchange (base station) receives a call setup request from a mobile terminal (wireless telephone) to another subscriber, the exchange sends the subscriber to the home memory station. Information is inquired, and when the response is received, information indicating whether or not there is a message for the mobile terminal in the voice storage service is held, and the call based on the call is terminated, and There is disclosed a system in which when a switching center receives a disconnection signal and transmits a release signal to a mobile terminal, the held message presence / absence information is also transmitted and displayed on the mobile terminal. In this conventional apparatus, every time a user uses a mobile terminal, the status of message storage by the voice storage service is notified to the terminal, and a call for reproducing the stored message can be made as needed.

[0005]

In the conventional voice storage system as described above, the storage and playback of voice messages between a mobile terminal and a voice storage device via a mobile exchange are performed as follows. It was done. That is, in the conventional voice storage system, a PCM (pulse code modula- tion) is performed by a voice encoding / decoding device provided in a mobile terminal.
ulation, pulse code modulation) voice is voice-coded, the generated voice-coded packet is transmitted by radio, and voice-decoded by the voice coding / decoding device provided in the mobile exchange, and the PC is decoded.
After returning to M speech, the speech encoding / decoding device provided on the speech storage device side encodes the PCM speech again, and accumulates speech encoded packets generated thereby.

When there is a request to play back the stored message, the voice encoding / decoding device on the side of the voice storage device decodes the voice coded packet into voice, and then the PC
The M voice is transmitted to the voice coding / decoding device on the mobile exchange side, where the PCM voice is voice-coded again, and the voice-coded packet generated thereby is wirelessly transmitted, and the voice coding provided in the mobile terminal is performed. The PCM sound is reproduced by decoding the sound by the decoding device.

However, in the above-described conventional voice storage system, when a PCM voice based on a voice message from a mobile terminal is stored in a voice storage device and reproduced, the mobile terminal, the mobile switching center, and the voice storage device require:
As described above, speech encoding /
In order to perform the audio decoding, it is inevitable that the audio quality deteriorates.

[0008] The present invention has been made in view of such circumstances, and a PC using a voice message from a mobile terminal.
Speech storage method and speech storage system capable of minimizing the degradation of speech quality (sound quality) due to speech encoding / speech decoding when accumulating M speech in a speech storage device and reproducing the speech. The purpose is to obtain.

[0009]

In order to meet such an object, a voice storing method according to the present invention uses a PCM voice transmitted from a mobile terminal as another mobile terminal as a called party.
A fixed network terminal and a mobile exchange for selectively transmitting data to a voice storage device are provided. The mobile exchange is provided with a voice coding / decoding device and a speech path switch, and the voice storage device is provided with a voice coding / decoding device. An audio storage system provided with an apparatus and storage means for storing PCM audio is configured as follows. That is, when the PCM voice from the mobile terminal is stored in the voice storage device, the voice coded packet generated by voice coding the PCM voice on the input side by the voice coding / decoding device on the mobile terminal side is used for moving. Transmitted to the exchange, and the voice encoding and
The decoding control device identifies the called party of the voice-encoded packet, and if the called party is a voice storage device, outputs a voice coding / decoding stop signal to the voice coding / decoding section on the mobile exchange side.
The speech is transmitted to the decoding device and the voice storage device. When the voice coding / decoding device on the mobile exchange receives the voice coding / decoding stop signal, the voice decoding is stopped, and the voice coded packet is transmitted. To the audio storage device,
If the decoding stop signal is not received, speech decoding is performed to convert the speech coded packet into PCM speech,
The CM voice is transmitted to another called mobile terminal or fixed network terminal, and when the voice storage device receives the voice coding / decoding stop signal, voice coding is stopped and the voice coded packet is transmitted. If the PCM voice is stored in the storage means as it is and no voice coding / decoding stop signal is received, voice coding is performed to convert the PCM voice into a voice coded packet, and the voice coded packet is stored in the storage means. .

Further, at the time of playing back the message stored in the above-mentioned voice storage device, the voice encoding / decoding control device on the mobile exchange side identifies the called party, and the called party is the voice storage device. In this case, when the speech encoding / decoding stop signal is transmitted to the speech encoding / decoding device and the speech storage device on the mobile exchange side, and the speech storage device receives the speech encoding / decoding stop signal, Stop audio decoding,
The voice-encoded packet is transmitted to the mobile exchange as it is,
If the voice coded / decoded signal is not received, voice decoding is performed to convert the voice coded packet into PCM voice, and this PCM voice is transmitted to the mobile switching center, and the voice coding / decoding on the mobile switching side is performed. When the decoding device receives the speech encoding / decoding stop signal, the speech encoding is stopped, the speech encoded packet is transmitted as it is to the speech encoding / decoding device on the mobile terminal side, and the speech encoding is performed. If the decoding stop signal is not received, voice coding is performed, PCM voice from the called party is converted into voice coded packets, and the voice coded packets are transmitted to the voice coding / decoding device on the mobile terminal side. The voice coded packet is transmitted and converted into PCM voice by the voice coding / decoding device on the mobile terminal side.

In the voice storage method according to the present invention, when a voice message from a terminal of a fixed line is stored in a voice storage device, the PCM voice on the input side is stored from the fixed network switch via a mobile switch. The voice data is transmitted to a device, and voice coding is performed by the voice coding / decoding device on the voice storage device side, the PCM voice is converted into a voice coded packet, and the voice coded packet is stored. Further, when the message stored in the voice storage device is played back on a fixed network terminal, voice decoding is performed by a voice coding / decoding device on the voice storage device side, and the voice coded packet is converted to a PCM.
Converting the PCM voice from the mobile exchange to the fixed network terminal via the fixed network exchange,
The PCM audio is reproduced.

A voice storage system according to the present invention includes a mobile switching device for selectively transmitting PCM voice transmitted from a mobile terminal to another mobile terminal, a fixed network terminal, or a voice storage device. A voice encoding / decoding device and a communication path switch, and the voice storage device includes a voice encoding / decoding device and storage means for storing PCM voice. When the PCM voice from the mobile terminal is stored in the voice storage device, the voice encoding / decoding device on the mobile terminal side uses the P code on the input side.
The voice coded packet generated by voice coding the CM voice is transmitted, thereby identifying the called party of the voice coded packet and performing voice coding when the called party is a voice storage device. A voice coding / decoding control device is provided in the mobile switching device to transmit the decoding stop signal to the voice coding / decoding device and the voice storage device on the mobile switching device side. Then, when the voice encoding / decoding stop signal from the voice encoding / decoding control device is received by the voice encoding / decoding device on the mobile exchange side, the voice decoding is stopped, and The coded packet is transmitted to the voice storage device, and if no voice coding / decoding stop signal is received, voice decoding is performed to convert the voice coded packet into PCM voice, and the PCM voice is transmitted to the called party. To another mobile terminal or fixed network terminal, and when the voice storage device receives the voice coding / decoding stop signal, stops voice coding and stores the voice coded packet in the storage means as it is. If a speech encoding / decoding stop signal is not received, speech encoding is performed to convert PCM speech into speech encoded packets, and the speech encoded packets are stored in the storage means.

Further, at the time of reproducing the message stored in the above-mentioned voice storage device, the voice encoding / decoding control device on the mobile exchange side identifies the called party, and the called party is the voice storage device. In this case, a voice coding / decoding stop signal is transmitted to the voice coding / decoding device and the voice storage device on the mobile exchange side, and the voice storage device receives the voice coding / decoding stop signal. In this case, the voice decoding is stopped, the voice coded packet is transmitted to the mobile exchange as it is, and if the voice coded / decoded signal is not received, voice decoding is performed to convert the voice coded packet into a PCM.
It converts the PCM voice to voice, transmits the PCM voice to the mobile switch, and stops voice coding when the voice coding / decoding device on the mobile switch side receives the voice coding / decoding stop signal, Transmit the voice-encoded packet as it is to the mobile terminal-side voice encoding / decoding device, perform voice encoding when not receiving a voice encoding / decoding stop signal,
The PCM voice from the called party is converted into a voice coded packet, and the voice coded packet is transmitted to a voice coding / decoding device on the mobile terminal side.
The decoding device converts the speech encoded packet into PCM speech.

[0014] The voice storage system according to the present invention comprises:
When a voice message from a terminal of a fixed line is stored in a voice storage device, PCM voice on the input side is transmitted from the fixed network exchange to the voice storage device via a mobile exchange, and voice coding on the voice storage device side is performed. The speech encoding is performed by the decoding device, the PCM speech is converted into speech encoded packets, and the speech encoded packets are stored. Further, when playing back the message stored in the voice storage device to the terminal of the fixed network, voice decoding is performed by the voice coding / decoding device on the voice storage device side, and the voice coded packet is converted into PCM voice. The PCM voice is transmitted from the mobile switching center to the fixed network terminal via the fixed network switching system, and the PCM voice is reproduced.

According to the present invention, in a voice storage system provided with a mobile switchboard for transmitting data to and from a mobile terminal and a voice storage device, a caller is identified by a caller identification means, and a message storage request is issued from the mobile terminal. If there is, a control signal is sent to a voice coding / decoding control device provided in the base station or the mobile switching center so that voice decoding is not performed by the voice coding / decoding device. Then, the voice coded packet of the PCM voice wirelessly transmitted from the mobile terminal is stored in the storage means as it is without being voice coded by the mobile exchange or the voice storage device.

At the time of message reproduction when a reproduction request is issued from the mobile terminal, the voice encoding / decoding control device of the mobile exchange identifies the called party, and performs voice encoding / decoding in accordance with the identification. The transmission stop signal is transmitted to the voice coding / decoding device of the mobile exchange side and the voice coding / decoding device of the voice storage device, and the voice coding is performed by the voice coding / decoding device in the voice storage device or the mobile switching device. The voice encoding packet is transmitted from the voice storage device to the mobile terminal via the mobile switching center without any modification. The mobile terminal performs voice decoding on the transmitted voice coded packet and reproduces the PCM voice to generate a voice message, so that voice coding / voice decoding in the voice storage system can be performed by only one stage from the conventional multi-stage processing. The minimum necessary audio encoding / decoding processing is performed to prevent audio quality deterioration.

On the other hand, when there is a reproduction request from a fixed network terminal, the voice storage device can voice-decode the voice coded packet and transmit a PCM voice message to the fixed network terminal. is there.

[0018]

FIG. 1 is a block diagram showing an embodiment of a voice storage system using a voice storage device according to the present invention. In the figure, reference numeral 1 denotes a mobile terminal, which is provided with a voice coding / synthesis unit that voice-codes PCM voice obtained from a voice signal to generate a voice-coded packet.
A decoding device 2 and a modulation / demodulation device 3 for modulating the encoded voice packet are provided. In the figure, 1A is a mobile terminal different from the above-mentioned mobile terminal 1, 2A is a voice encoding / decoding device provided therein, and 3A is a modem.

Reference numeral 4 denotes a base station connected to the mobile terminal 1 by wireless transmission. The base station 4 includes a modem 5 for demodulating a voice coded packet modulated from the mobile terminal 1 and transmitted wirelessly. Is provided.

Reference numeral 6 denotes a mobile switch for transmitting a voice coded packet from the base station 4. The mobile switch 6 includes a voice coding / decoding device for voice decoding a demodulated voice coded packet. 7 and a voice encoding / decoding stop signal is transmitted to the voice encoding / decoding device 7 when the called party is a voice storage device 10 to be described later. An audio encoding / decoding control device 8 for controlling so as not to perform audio decoding is provided.

Further, the mobile exchange 6 is provided with a speech path switch 9 for switching and connecting the mobile exchange 6 to the voice storage device 10 or the fixed network exchange 14. The voice storage device 10 is used to convert PCM voice by voice message into voice coded packets and store it as voice mail. The voice coder / decoder 11 and the voice coder / decoder 11 An audio encoding / decoding control device 12 that controls whether or not to perform audio encoding in the decoding device 11 is provided. The voice coding / decoding control device 12 includes a voice exchange / coding control device 8 for identifying a called party in the mobile exchange 6, and a voice when the called party is the voice storage device 10. When the encoding / decoding stop signal is transmitted to the audio encoding / decoding device 7, the audio encoding / decoding stop signal is transmitted via the communication path switch 9.

Reference numeral 13 denotes a memory provided in the voice storage device 10 as voice message storage means.
In the voice storage device 10, when the voice coding / decoding control device 12 receives the voice coding / decoding stop signal, control is performed so that the voice coding / decoding device 11 does not perform voice coding. The encoded voice packet is stored as it is. When the audio encoding / decoding control device 12 does not receive the audio encoding / decoding stop signal in the audio accumulating device 10, the audio encoding / decoding device 11 performs the audio encoding to convert the PCM audio. The voice coded packet is converted into a voice coded packet, and the voice coded packet is stored in the memory 13.

Reference numeral 15 denotes a telephone set 15, which is a fixed network terminal connected to the fixed network exchange 14. For example, when the called party identified by the voice encoding / decoding control device 8 is not the voice storage device 10, ie, In the case of another mobile terminal or a terminal on a fixed network, the speech encoding / decoding device 7 that does not receive the speech encoding / decoding stop signal performs speech decoding, and the PCM speech converted from the speech encoded packet is ,
The fixed network switch 14 connected via the call path switch 9
It is configured to be transmitted via

The operation of the voice storage system having the above configuration will be described below. (1) When a message is stored from the mobile terminal 1 to the memory 13 of the voice storage device 10 The voice signal X (n) applied to the voice coding / decoding device 2 provided in the mobile terminal 1 is converted to a voice coded signal. The decoding device 2 voice-encodes the PCM voice to generate a voice-encoded packet. The encoded voice packet is transmitted to the modulation / demodulation device 3, modulated in the modulation / demodulation device 3, and wirelessly transmitted to the base station 4. In the base station 4, the data is demodulated by the modulation / demodulation device 5, and is returned to the original voice encoded packet. Then, the voice coded packet is transmitted to the mobile exchange 6.

In the mobile exchange 6, the voice encoding / decoding control device 8 identifies the called party. If the called party is the voice storage device 10, the voice coding / decoding stop signal is output. The signal is transmitted to the voice encoding / decoding device 7 provided in the mobile exchange 6 and also transmitted to the voice encoding / decoding control device 12 provided on the voice storage device 10 side via the communication path switch 9. On the other hand, the voice encoding / decoding control device 8 identifies the called party, and if the called party is not the voice storage device 10,
That is, another mobile terminal or a fixed network terminal (telephone 1
In the case of 5), the audio encoding / decoding stop signal is not generated.

When the audio encoding / decoding device 7 receives the audio encoding / decoding stop signal, the audio encoding / decoding device 7 does not decode the audio, and The signal is transmitted to the speech path switch 9 as it is, and is switched (switched and connected) by the speech path switch 9, and then transmitted to the voice storage device 10. On the other hand, when the audio encoding / decoding device 7 does not receive the audio encoding / decoding stop signal, the audio encoding / decoding device 7 performs audio decoding, and converts the encoded audio packet into PCM audio. The PCM voice is transmitted to the communication path switch 9 and switched (switched connection) by the communication path switch 9, and then another mobile terminal or a fixed network terminal other than the voice storage device 10 which is a called party. (Telephone 15).

In the voice storage device 10, voice coding / coding is performed.
When the decoding control device 12 receives the audio encoding / decoding stop signal, the audio encoding / decoding device 11 controls the audio encoding not to be performed, and converts the PCM audio into the audio encoded packet. Is stored in the memory 13. On the other hand, in the voice storage device 10, the voice encoding / decoding control device 12
Does not receive the speech encoding / decoding stop signal, the speech encoding / decoding device 11 performs speech encoding, converts PCM speech into speech encoded packets, and stores the speech encoded packets in the memory 13. To accumulate.

(2) The message stored in the memory 13 of the voice storage device 10 from the mobile terminal 1 is transferred to another mobile terminal 1
In the case of hearing from A In the mobile exchange 6, the voice encoding / decoding control device 8 identifies the called party, and the called
, The speech encoding / decoding stop signal is transmitted to the speech encoding / decoding device 7 provided in the mobile exchange 6, and the speech storage device 10 is
Is also transmitted to the speech encoding / decoding control device 12 provided in the first section. On the other hand, the voice encoding / decoding control device 8 identifies the called party, and if the called party is not the voice storage device 10, that is, if it is another mobile terminal or a fixed-line terminal (telephone 15). , Does not generate a speech encoding / decoding stop signal.

When the speech encoding / decoding control unit 12 provided in the speech storage device 10 receives the speech encoding / decoding stop signal, the speech encoding packet is read from the memory 13 and the speech encoding packet is decoded. Instead, the packet is transmitted to the mobile exchange 6 as it is as a voice-encoded packet. On the other hand, when the audio encoding / decoding control device 12 provided in the audio storage device 10 does not receive the audio encoding / decoding stop signal, the audio encoding packet is read from the memory 13 and the audio encoded packet is read. It decodes and converts the voice-encoded packet into PCM voice, and transmits this PCM voice to the mobile exchange 6.

After being switched (switched and connected) by the communication path switch 9 to the mobile exchange 6, the signal is transmitted to the voice encoding / decoding device 7. When the audio encoding / decoding device 7 receives the audio encoding / decoding stop signal,
In the audio encoding / decoding device 7, without performing the audio encoding,
The voice coded packet is transmitted to the base station 4 as it is. On the other hand, when the audio encoding / decoding device 7 does not receive the audio encoding / decoding stop signal, the audio encoding / decoding device 7 performs the audio encoding and converts the PCM audio into the audio encoded packet. After that, the voice coded packet is transmitted to the base station 4. In the base station 4, the data is modulated by the modulation / demodulation device 5 and wirelessly transmitted to the mobile terminal 1A.

In the mobile terminal 1A, the data is demodulated by the modulation / demodulation device 3A and transmitted to the voice encoding / decoding device 2A. In the audio encoding / decoding device 2A, the audio encoded packet is audio-decoded into PCM audio.

(3) When a message is stored in the memory 13 of the voice storage device 10 from the fixed terminal (telephone 15) The voice signal X (n) applied to the telephone 15 connected to the fixed network switch 14 is fixed. The data is transmitted to the fixed network exchange 14 via the network. The PCM voice is transmitted to the fixed network switch 1
At 4, a communication path switch (not shown) provided therein is switched (switched and connected) and transmitted to the mobile exchange 6. In the mobile exchange 6, the data is transmitted to the voice encoding / decoding device 11 provided in the voice storage device 10 via the communication path switch 9. The voice encoding / decoding device 11 voice-encodes the PCM voice to generate a voice-encoded packet, and stores the packet in the memory 13.

(4) When the fixed terminal (telephone 15) listens to the message stored in the memory 13 of the voice storage device 10 from the fixed terminal: In the voice encoding / decoding device 11 provided in the voice storage device 10, The voice coded packet stored in the memory 13 is voice-decoded into PCM voice and transmitted to the mobile switching center 6. In the mobile exchange 6, the data is transmitted to the fixed network exchange 14 via the communication path switch 9. Then, in the fixed network exchange 14, the speech path switch inside the fixed network exchange 14 is switched to be transmitted to the telephone set 15 connected to the fixed network, and the voice signal X '(n) is reproduced.

(5) When the mobile terminal 1 listens to this message from the fixed terminal (telephone 15) after storing the message in the memory 13 of the voice storage device 10, and from the fixed terminal (telephone 15) to the memory of the voice storage device 10. 13 when the mobile terminal 1 hears this message after storing the message in these cases.
The memory 13 stores information indicating whether the PCM voice (voice coded packet) is stored in the memory 13 or the PCM voice (voice coded packet) from the fixed terminal (telephone 15).
In this case, it is possible to easily cope with this by reproducing the information along with this information at the time of reproduction.

It should be noted that the present invention is not limited to the structure described in the above-described embodiment, but that the shape, structure, etc. of each part of the voice storage system using the voice storage device 10 can be appropriately modified or changed. Not even.

[0036]

As described above, according to the voice storage method and the voice storage system according to the present invention, PCM voice by a voice message from a mobile terminal is stored in a voice storage device via a mobile exchange, and is stored in the voice storage device. At the time of reproduction, when the called party is a voice storage device, a voice coding / decoding stop signal is transmitted using a voice coding / decoding control device, and voice codes provided in a mobile exchange and a voice storage device are transmitted. Speech encoding / speech decoding in the encoding / decoding device is stopped, the speech encoded packet encoded in speech in the mobile terminal 1 is stored in the speech storage device as it is, and the speech encoding stored in the speech storage device is reproduced during reproduction. The packet is sent to the mobile terminal as it is, and the mobile terminal performs voice decoding, so that voice encoding / voice decoding is performed only once. It is possible to suppress the voice messages to minimize degradation of voice quality in the case where the reproduced sound storage device.

That is, conventionally, the voice quality is deteriorated because the voice encoding / decoding is performed three times in the mobile terminal, the mobile switching center, and the voice storage device. According to this method, the PCM voice from the voice storage device is reproduced by performing voice coding / decoding only once between the mobile terminal and the voice storage device via the mobile exchange. Degradation of the sound quality of the sound can be minimized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a voice storage system employing a voice storage method according to the present invention.

[Explanation of symbols]

1, 1A: mobile terminal, 2, 2A: voice coding / decoding device, 3, 3A: modulation / demodulation device, 4: base station, 5: modulation / demodulation device, 6: mobile exchange, 7: voice coding / decoding apparatus,
8: voice coding / decoding control device, 9: speech path switch, 10: voice storage device, 11: voice coding / decoding device, 12: voice coding / decoding control device, 13: memory (storage means ), 14: fixed network exchange, 15: telephone.

Claims (6)

[Claims] 1. A mobile exchange for selectively transmitting PCM voice transmitted from a mobile terminal to another mobile terminal, a fixed network terminal or a voice storage device, wherein the mobile exchange has voice encoding / decoding. And a speech path switch. The speech storage device includes a speech encoding / decoding device and
In a voice storage system provided with storage means for storing CM voice, when PCM voice from the mobile terminal is stored in the voice storage device, the voice encoding / decoding device provided in the mobile terminal uses an input side. A voice-encoded packet generated by voice-encoding the PCM voice is transmitted to the mobile exchange, and a voice-encoding / decoding control device provided in the mobile exchange identifies a called party of the voice-encoded packet. If the called party is a voice storage device, a voice coding / decoding stop signal is transmitted to the voice coding / decoding device and the voice storage device on the side of the mobile switchboard; When the voice coding / decoding device on the exchange side receives the voice coding / decoding stop signal, the voice decoding is stopped, and the voice coded packet is transmitted to the voice storage device. If an encoding / decoding stop signal is not received, voice decoding is performed to convert the voice coded packet into PCM voice, and this PCM voice is transmitted to another mobile terminal or fixed network terminal which is the called party. When the voice storage device receives a voice coding / decoding stop signal, voice coding is stopped, and the voice coded packet is stored in the storage unit as it is, and voice coding / decoding is performed.
If the decoding stop signal is not received, voice encoding is performed to convert the PCM voice into voice coded packets, the voice coded packets are stored in the storage means, and the message stored in the voice storage device is reproduced. Sometimes,
The called party is identified by the voice coding / decoding control device on the side of the mobile switching system, and if the called party is the voice storage device, the voice coding / decoding stop signal is transmitted to the mobile switching device. To the audio encoding / decoding device and the audio storage device, and when the audio storage device receives the audio encoding / decoding stop signal, stops the audio decoding, and outputs the audio encoded packet. It is transmitted to the mobile exchange as it is,
If no decoded signal is received, voice decoding is performed to convert the voice-encoded packet into PCM voice, and this PCM
The voice is transmitted to the mobile switch, and when the voice coding / decoding device on the mobile switch receives the voice coding / decoding stop signal, the voice coding is stopped and the voice coded packet is transmitted. Transmit to the audio encoding / decoding device on the mobile terminal side as it is, perform audio encoding when not receiving an audio encoding / decoding stop signal,
The PCM voice from the called party is converted into a voice coded packet, and the voice coded packet is transmitted to the voice coder / decoder on the mobile terminal side, and the voice coder / decoder on the mobile terminal side is converted. A voice storage method comprising: converting a voice-encoded packet into PCM voice according to: 2. The voice storage method according to claim 1, wherein when a voice message from a terminal of a fixed line is stored in a voice storage device, PCM voice on an input side is transmitted from a fixed network switch via a mobile switch. The voice data is transmitted to a storage device, voice coding is performed by a voice coding / decoding device on the voice storage device side, PCM voice is converted into voice coded packets, and the voice coded packets are stored. Voice storage method. 3. The voice storage method according to claim 1, wherein when the message stored in the voice storage device is reproduced on a fixed network terminal, the voice encoding / decoding device on the voice storage device side. Performing voice decoding, converting the voice coded packet into PCM voice, transmitting the PCM voice from the mobile exchange to the fixed network terminal via the fixed network switch, and reproducing the PCM voice; A voice storage method characterized by the following. 4. A mobile exchange for selectively transmitting PCM voice transmitted from a mobile terminal to another mobile terminal, a fixed network terminal, or a voice storage device, wherein the mobile exchange has voice encoding / decoding. And a speech path switch. The speech storage device includes a speech encoding / decoding device and
In a voice storage system provided with storage means for storing CM voice, when PCM voice from the mobile terminal is stored in the voice storage device, a voice encoding / decoding device provided in the mobile terminal uses an input side. A voice-encoded packet generated by voice-encoding PCM voice is transmitted to identify a called party of the voice-encoded packet, and when the called party is the voice storage device, A voice coding / decoding control device provided in the mobile switching device to transmit an encoding / decoding stop signal to the voice coding / decoding device and the voice storage device on the mobile switching device side, When the voice coding / decoding stop signal from the voice coding / decoding control device is received by the voice coding / decoding device on the mobile exchange side, the voice decoding is stopped, Transmit Goka packet to the voice storage device, converts the speech encoded packet into PCM speech by performing speech decoding when not receiving the voice coding and decoding stop signal,
This PCM voice is transmitted to another called mobile terminal or fixed network terminal, and when the voice storage device receives a voice coding / decoding stop signal, voice coding is stopped and the voice coding is stopped. The encoded packet is stored in the storage means as it is,
If the decoding stop signal is not received, voice encoding is performed to convert the PCM voice into voice coded packets, the voice coded packets are stored in the storage means, and the message stored in the voice storage device is reproduced. Sometimes,
The voice encoding / decoding control device on the side of the mobile switching center identifies a called party, and when the called party is the voice storage device, outputs a voice coding / decoding stop signal to the mobile switching center. To the voice encoding / decoding device on the side and the voice storage device, and when the voice storage device receives the voice coding / decoding stop signal, stops voice decoding and transmits the voice-coded packet. It is transmitted to the mobile exchange as it is,
If no decoded signal is received, voice decoding is performed to convert the voice-encoded packet into PCM voice, and this PCM
The voice is transmitted to the mobile switching system, and when the voice coding / decoding device on the mobile switching system receives the voice coding / decoding stop signal, the voice coding is stopped, and the voice coded packet is transmitted. Transmit to the audio encoding / decoding device on the mobile terminal side as it is, perform audio encoding when not receiving an audio encoding / decoding stop signal,
The PCM voice from the called party is converted into a voice coded packet, and the voice coded packet is transmitted to the voice coder / decoder on the mobile terminal side, and the voice coder / decoder on the mobile terminal side is converted. Characterized in that the encoded speech packet is converted into PCM speech by the following method. 5. The voice storage system according to claim 4, wherein when a voice message from a terminal of a fixed line is stored in a voice storage device, PCM voice on an input side is transmitted from a fixed network switch via a mobile switch. It is configured to transmit to the storage device, perform voice coding by the voice coding / decoding device on the voice storage device side, convert PCM voice into voice coded packet, and store the voice coded packet. A voice storage system characterized by the following. 6. The voice storage system according to claim 4, wherein when the message stored in the voice storage device is reproduced to a terminal on a fixed network, the voice encoding / decoding device on the voice storage device side. It performs voice decoding, converts the voice coded packet into PCM voice, transmits the PCM voice from the mobile exchange to the fixed network terminal via the fixed network switch, and reproduces the PCM voice. A voice storage system characterized in that: