JP2000358260A - Voice coding and decoding device, voice coding and decoding system and voice coding and decoding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a voice coding and decoding device that processes a voice signal, an in-voice-band signal and also a dual tone multi-frequency DTMF signal to reliably transmit the DTMF signal in addition to the voice signal and the in-voice-band signal. SOLUTION: The voice coding and decoding device is provided with a signal identification means 32 that identifies a voice signal and a in-voice-band signal from signals outputted from a terminal and with a DTMF/tone detection means 34 that detects a DTMF signal from the signal, and also with a 1st selector 30 that is used to output the identification or detection result to other devices and allows a 1st voice coding means 36 to process the in-voice-band signal, a 2nd voice coding means 38 to process the voice signal and a 3rd voice coding means 38 to process the DTMF signal. The 1st to 3rd voice coding means are configured so that they can encode the respective signals accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio encoding / decoding apparatus, an audio encoding / decoding system, and an audio encoding / decoding method.
The present invention relates to an audio encoding / decoding device that handles an F (Dual Tone Multi Frequency) signal, an audio encoding / decoding system, and an audio encoding / decoding method.

[0002]

2. Description of the Related Art Conventionally, in order to efficiently transmit a voice signal or the like through a communication line, a voice encoding / decoding apparatus has been used. The audio encoding / decoding device encodes and outputs an audio signal or the like output from a terminal device such as a telephone or a facsimile, and also outputs another audio encoding / decoding device (hereinafter referred to as an “opposite device”).
) Is supplied to the terminal when the encoded signal is supplied.

FIG. 3 is a block diagram showing a conventional speech encoding / decoding apparatus. 2. Description of the Related Art Conventional voice encoding / decoding devices include, from a terminal device such as a telephone, in addition to a voice signal, a facsimile output signal, a modem signal (hereinafter, referred to as a "voice band signal"), or a button operation of a touch-tone telephone. Twelve types of tone signals that are output in association therewith, that is, DTMF signals generated by superimposing two frequency signals may be output.

[0004] Those signals output from the terminal equipment are:
The signal is supplied to the signal identifying means 12 together with the first selector means 10. The signal identification unit 12 determines whether the signal is a signal other than an audio signal or a signal based on the characteristics of the transmitted signal, specifically, based on the frequency and frequency band of the signal, the manner of signal fluctuation, and the like. It identifies whether the signal is a signal, and supplies the identification result to the first selector 10.

[0005] The first selector 10 outputs the identification result supplied from the signal identification means 12 to the opposing device, and outputs a signal other than the audio signal to the first audio encoding means 14 based on the identification result. Also, the audio signal is supplied to the second audio encoding means 16. Therefore, in the conventional device, the first voice encoding means 14 uses the signal in the voice band and the DTMF signal.
And the second audio encoding means 16 processes the audio signal.

[0006] The first speech encoding means 14 and the second speech encoding means 16 encode the received signal according to a predetermined algorithm, and transmit each at an appropriate transmission rate. In the conventional speech encoding / decoding device, the speech signal, the signal in the speech band, or the DTMF signal is encoded in this manner.

[0007] A conventional speech encoding / decoding device is supplied with an encoded signal and an identification result relating to the type of the signal from an opposite device. Those signals and the identification result are received by the second selector means 18. The second selector means 18 supplies an encoded signal based on an in-speech signal or a DTMF signal to the first speech decoding means 20 based on the received identification result, and converts the encoded signal based on the speech signal. It is supplied to the second audio decoding means 22.

[0008] The first audio decoding means 20 and the second audio decoding means 22 decode the received signal according to a predetermined algorithm, and transmit the decoded signal to the terminal equipment. In the conventional speech encoding / decoding device, the speech signal, the signal in the speech band, or the DTMF signal is decoded in this manner.

[0009]

However, in the conventional speech encoding / decoding device, both the in-speech signal and the DTMF signal are processed by the first speech encoding means 14 and the first speech decoding means 20. More specifically, in the conventional speech encoding / decoding device, resources for processing DTMF signals (resources of software and hardware) are substituted with resources for processing signals in a speech band. For this reason, the conventional speech encoding / decoding device has a problem that the DTMF signal cannot be transmitted faithfully, in other words, a problem that the transmission of the DTMF signal becomes uncertain.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an audio encoding / decoding apparatus and an audio codec capable of reliably transmitting a DTMF signal in addition to an audio signal and an in-band signal. It is an object to provide an encoding / decoding system and an audio encoding / decoding method.

[0011]

According to the first aspect of the present invention,
A speech encoding / decoding device that encodes and outputs a signal output from a terminal device and decodes an encoded signal supplied from another device and supplies the encoded signal to the terminal device, wherein the signal output from the terminal device Is a voice signal, a signal in a voice band, or a DTMF signal, and an identification result for notifying another device of the identification result of the signal identification detection means. Notifying means, first audio encoding means for accurately encoding and outputting a signal in an audio band, second audio encoding means for accurately encoding and outputting an audio signal, and accurately encoding a DTMF signal The third audio encoding means for outputting, and the signal output from the terminal device among the signals output from the terminal equipment, the signal in the audio band is sent to the first audio encoding means, and the audio signal is sent to the second audio encoding means. Phonetic code The means, is characterized in further comprising a first selector which processes respective DTMF signal to the third audio encoding means.

According to a second aspect of the present invention, a speech encoding / decoding apparatus which encodes and outputs a signal output from a terminal apparatus, decodes an encoded signal supplied from another apparatus, and supplies the decoded signal to the terminal apparatus. A first decoding device that accurately decodes an encoded signal based on an in-band signal and outputs the decoded signal to a terminal device.
Audio decoding means, and second audio decoding means for accurately decoding an encoded signal based on the audio signal and outputting the decoded signal to a terminal device;
A third speech decoding means for accurately decoding the coded signal based on the DTMF signal and outputting the decoded signal to the terminal equipment; To the first audio decoding means, an encoded signal based on an audio signal to the second audio decoding means, and an encoded signal based on a DTMF signal to the third audio decoding means. The second to process each
And a selector.

According to a third aspect of the present invention, there is provided the speech encoding / decoding apparatus according to the first aspect, wherein the first encoding / decoding apparatus accurately decodes an encoded signal based on a signal in an audio band and outputs the decoded signal to a terminal device.
Audio decoding means, and second audio decoding means for accurately decoding an encoded signal based on the audio signal and outputting the decoded signal to a terminal device;
A third speech decoding means for accurately decoding the coded signal based on the DTMF signal and outputting the decoded signal to the terminal equipment; To the first audio decoding means, an encoded signal based on an audio signal to the second audio decoding means, and an encoded signal based on a DTMF signal to the third audio decoding means. The second to process each
And a selector.

According to a fourth aspect of the present invention, there is provided a speech encoding / decoding system including a plurality of speech encoding / decoding apparatuses in a network, wherein the speech encoding / decoding apparatus according to the first aspect and the speech encoding / decoding apparatus according to the second aspect are provided. And an encoding / decoding device.

According to a fifth aspect of the present invention, there is provided a speech encoding / decoding method for encoding and outputting a signal output from a terminal device, decoding an encoded signal supplied from another device, and supplying the decoded signal to the terminal device. And a step of identifying whether the signal output from the terminal device is an audio signal, an in-band signal, or a DTMF signal; and transmitting the result of the identification to another device. Notifying, and, if the signal output from the terminal device is an in-voice signal, processing the signal in a manner that can accurately encode and output the in-voice signal, and output from the terminal device. Processing the signal in such a way that if the signal is an audio signal, the audio signal can be accurately encoded and output; and if the signal output from the terminal device is a DTMF signal, It is characterized in that exactly comprising the steps of: processing the signal in a way that can be output by encoding the a degree.

According to a sixth aspect of the present invention, there is provided a speech encoding / decoding method for encoding and outputting a signal output from a terminal device, decoding an encoded signal supplied from another device, and supplying the encoded signal to the terminal device. Receiving an identification signal indicating the type of the signal together with the encoded signal from another device, and based on the identification signal, the received encoded signal is based on an in-speech signal. Determining whether the signal is based on an audio signal or a DTMF signal; and determining that an encoded signal based on an in-voice signal has been received. Decoding the coded signal based on the in-speech signal in a manner that can accurately decode the signal; and, if it is determined that the coded signal based on the speech signal has been received, Decoding the coded signal based on the DTMF signal in a manner capable of accurately decoding the coded signal based on the DTMF signal, if the coded signal based on the DTMF signal is determined to be received; Decoding the signal in a method that can accurately decode the signal.

According to a seventh aspect of the present invention, there is provided a speech encoding / decoding apparatus for encoding and outputting a signal output from a terminal device, decoding an encoded signal supplied from another device, and supplying the encoded signal to the terminal device. When the signal output from the terminal device is a voice signal or a signal in a voice band, a signal identification unit that outputs an identification result indicating the type of the signal, and the identification result of the signal identification unit is another Identification result notifying means for notifying the device of the first, first audio encoding means for accurately encoding and outputting the in-voice signal, and second audio encoding means for accurately encoding and outputting the audio signal. According to the identification result of the signal identification means, among the signals output from the terminal equipment, the signal in the audio band is processed by the first audio encoding means, and the audio signal is processed by the second audio encoding means. No. A selector, to detect the DTMF signals from the signal output from the terminal device and is characterized by comprising a DTMF signal detecting means for outputting frequency information of the DTMF signal.

[0018] The invention according to claim 8 is an audio coding / decoding apparatus which encodes and outputs a signal output from a terminal apparatus, and decodes an encoded signal supplied from another apparatus and supplies the decoded signal to the terminal apparatus. A first decoding device that accurately decodes an encoded signal based on an in-band signal and outputs the decoded signal to a terminal device.
Audio decoding means, and second audio decoding means for accurately decoding an encoded signal based on the audio signal and outputting the decoded signal to a terminal device;
On the basis of the identification signal notified together with the encoded signal from another device, the encoded signal based on the signal in the audio band to the first audio decoding means, and the encoded signal based on the audio signal A second selector for causing the second audio decoding means to process the signal, and a DTMF signal corresponding to the frequency information when the frequency information of the DTMF signal is supplied from another device.
A DTMF signal generating means for generating an F signal; a signal decoded by the first or second audio decoding means;
And a third selector for selectively supplying the DTMF signal generated by the F signal generating means to the terminal device.

According to a ninth aspect of the present invention, there is provided the audio encoding / decoding apparatus according to the seventh aspect, wherein the first encoded signal based on the signal in the audio band is accurately decoded and output to the terminal device.
Audio decoding means, and second audio decoding means for accurately decoding an encoded signal based on the audio signal and outputting the decoded signal to a terminal device;
On the basis of the identification signal notified together with the encoded signal from another device, the encoded signal based on the signal in the audio band to the first audio decoding means, and the encoded signal based on the audio signal A second selector for causing the second audio decoding means to process the signal, and a DTMF signal corresponding to the frequency information when the frequency information of the DTMF signal is supplied from another device.
A DTMF signal generating means for generating an F signal; a signal decoded by the first or second audio decoding means;
And a third selector for selectively supplying the DTMF signal generated by the F signal generating means to the terminal device.

According to a tenth aspect of the present invention, there is provided a speech encoding / decoding system including a plurality of speech encoding / decoding apparatuses in a network, wherein the speech encoding / decoding apparatus according to the seventh aspect includes:
A speech encoding / decoding device according to claim 8 is provided.

According to an eleventh aspect of the present invention, there is provided a speech encoding / decoding method for encoding and outputting a signal output from a terminal device, and decoding an encoded signal supplied from another device and supplying the encoded signal to the terminal device. In the case where the signal output from the terminal device is a voice signal or a signal in a voice band, a step of outputting an identification result indicating the type of the signal, and outputting the result of the identification to another device. Notifying, and, if the signal output from the terminal device is an in-voice signal, processing the signal in a manner that can accurately encode and output the in-voice signal, and output from the terminal device. If the signal is an audio signal, processing the audio signal in such a way that the audio signal can be accurately encoded and output; and DTMF from the signal output from the terminal device.
Detecting the signal and outputting frequency information of the DTMF signal.

According to a twelfth aspect of the present invention, there is provided a speech encoding / decoding method for encoding and outputting a signal output from a terminal device and decoding an encoded signal supplied from another device and supplying the encoded signal to the terminal device. Receiving an identification signal indicating the type of the signal together with the encoded signal from another device, and based on the identification signal, the received encoded signal is based on an in-speech signal. Decoding the encoded signal based on the in-speech signal in a manner that can accurately decode the signal, and based on the identification signal, the received encoded signal converts the speech signal. Decoding the encoded signal based on the audio signal in a method that can accurately decode the signal if the signal is determined to be based on the signal; and supplying frequency information of the DTMF signal from another device. Generating a DTMF signal corresponding to the frequency information, and selectively supplying the decoded in-band signal or the decoded audio signal and the generated DTMF signal to a terminal device. And the following.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, the first embodiment of the present invention will be described with reference to FIG. FIG.
1 shows a block diagram of a speech encoding / decoding device according to the present embodiment.
The audio encoding / decoding device according to the present embodiment encodes an audio signal or the like received from a terminal device such as a telephone and transmits the encoded signal to another audio encoding / decoding device (opposite device). Is a device that decodes a signal transmitted from the terminal and supplies it to the terminal device.

In the present embodiment, a terminal device sends a voice signal, a signal in a voice band such as a fax signal or a modem signal, a DTMF signal accompanying a push-tone telephone button operation, and a single signal to a voice encoding / decoding device. A tone signal composed of frequency components may be input. Less than,
By combining the DTMF signal and the above tone signal, “DTM
F / tone signal ".

The signals output from the terminal device are as follows:
In addition to being supplied to the first selector means 30, it is also supplied to the signal identification means 32 and the DTMF / tone signal detection means. The signal identification unit 32 determines whether the signal is an in-voice signal based on the characteristics of the transmitted signal,
Alternatively, whether the signal is an audio signal is identified, and the identification result is supplied to the first selector 30. The DTMF / tone signal detecting means 34 identifies whether or not the signal is a DTMF / tone signal based on the characteristics of the signal transmitted from the terminal device, and sends the identification result to the first selector 30. Supply.

The first selector 30 outputs the identification result supplied from the signal identification means 32 and the identification result supplied from the DTMF / tone signal detection means 34 to the opposing device. Further, the first selector 30 converts the in-speech signal into the first speech encoding means 3 based on the identification results.
6, the audio signal is sent to the second audio encoding means 38,
The TMF / tone signal is supplied to the third voice encoding means 40. Therefore, in the apparatus of the present embodiment, the signal in the audio band is processed by the first audio encoding unit 36, the audio signal is processed by the second audio encoding unit 38, and the DTMF is further processed by the third audio encoding unit 40. / Tone signal is processed.

The first to third speech encoding means 36, 38,
40 encodes each received signal according to a predetermined algorithm and transmits the signal at an appropriate transmission rate. In the present embodiment, the third voice encoding means 40 uses a dedicated resource for processing the DTMF / tone signal, that is,
Since it is realized by dedicated hardware or software, it is possible to accurately encode DTMF / tone signals. Therefore, according to the speech encoding / decoding device of the present embodiment, the speech signal, the signal in the speech band, and the DTMF /
All of the tone signals can be faithfully transmitted to the opposite device.

The speech encoding / decoding device of the present embodiment receives an encoded signal and an identification result relating to the type of the signal from the opposite device, specifically, whether the signal is a speech signal or a speech band. A signal indicating whether the signal is an internal signal or a DTMF / tone signal is supplied. Those signals and the identification result are received by the second selector means 42. The second selector 42 converts the encoded signal based on the in-speech signal into a first signal based on the received identification result.
The encoded signal based on the audio signal is supplied to the second audio decoding unit 46, and the encoded signal based on the DTMF / tone signal is supplied to the third audio decoding unit 48.

First to third speech decoding means 44, 46, 4
8 decodes the received signal according to a predetermined algorithm, and transmits the decoded signal to the terminal device. In the apparatus of the present embodiment, the third voice decoding means 48 is realized by a dedicated resource for processing the DTMF / tone signal, and therefore, can correctly decode the coded signal based on the DTMF / tone signal. Can be. Therefore, according to the speech encoding / decoding device of the present embodiment, all of the speech signal, the in-speech signal, and the DTMF / tone signal transmitted from the opposite device can be faithfully supplied to the terminal device.

As described above, the speech encoding / decoding apparatus according to the present embodiment has dedicated resources for processing DTMF / tone signals. Further, the speech encoding / decoding device of the present embodiment causes the DTMF / tone signal output from the terminal device to be processed by its dedicated resource, and furthermore, the coded signal based on the DTMF / tone signal transmitted from the opposite device. Is processed by the dedicated resource. Therefore, according to the speech encoding / decoding device of the present embodiment, it is possible to reliably transmit not only the speech signal and the signal in the speech band, but also the DTMF / tone signal.

In the above embodiment, the signal discriminating means 32 and the DTMF / tone signal detecting means 34 correspond to the "signal discriminating detecting means" according to the first embodiment, and the first selector 30 corresponds to the signal discriminating means according to the first embodiment. These correspond to “identification result notifying means” and “first selector”, respectively.

Embodiment 2 FIG. Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram of the speech encoding / decoding device according to the present embodiment. The speech encoding / decoding device according to the present embodiment encodes a speech signal or the like output from a terminal device such as a telephone and transmits the same to the opposite device, as well as the device according to the first embodiment. This is a device that decodes a signal transmitted from the opposite device and supplies it to the terminal device.

In this embodiment, an audio signal, an in-band signal, a DTMF / tone signal, and the like output from a terminal device are supplied to a first selector means 50, and a signal identification means 52 and a DTMF / tone signal. It is also supplied to the detecting means 54. The signal discriminating means 52 functions in the same manner as the signal discriminating means 32 of the first embodiment, and supplies the first selector 50 with a discrimination result indicating whether the received signal is an in-band signal or a voice signal. .

The first selector 50 outputs the identification result supplied from the signal identification means 52 to the opposing device, and, based on the identification result, sends the in-speech signal to the first audio encoding means 56. Further, the audio signal is supplied to the second audio encoding means 58. Therefore, in the device of the present embodiment,
The first audio encoder 56 processes the in-speech signal, and the second audio encoder 58 processes the audio signal. First to third speech encoding means 56, 58
Encodes each received signal according to a predetermined algorithm, and transmits the signal at an appropriate transmission rate.

In the present embodiment, the DTMF / tone signal detecting means 54 detects a DTMF / tone signal from the signals transmitted from the terminal equipment. And DT
When the MF / tone signal is detected, the frequency information of the signal is notified to the opposing device by a 4-bit code signal. As described above, when the DTMF / tone signal is output from the terminal device, the device according to the present embodiment is not the signal itself, but the signal itself.
Only the frequency information of the signal is supplied to the opposing device.

The speech encoding / decoding device of this embodiment includes a coded signal based on a speech signal or a signal in a speech band, an identification result concerning the type of the signal,
The frequency information of the DTMF / tone signal is transmitted. The coded signal and the identification result among those signals are received by the second selector means 60.

Based on the received identification result, the second selector means 60 outputs the coded signal based on the in-speech signal to the first sound decoding means 62 and the coded signal based on the sound signal. It is supplied to the second audio decoding means 64 respectively. First audio decoding means 62 and second audio decoding means 6
4 decodes the received signals according to a predetermined algorithm, and supplies the decoded signals to the third selector means 66.

The frequency information of the DTMF / tone signal transmitted from the opposite device is transmitted to the DTMF / tone signal generating means 6.
8 is received. Upon receiving the above frequency information, the DTMF / tone signal generating means 68 outputs a selection signal to the third selector means 66, and also outputs a DTMF signal or tone signal (single frequency component) corresponding to the frequency information. And supplies the generated signal to the third selector means 66.

When no selection signal is output from the DTMF / tone signal generating means 68, the third selector means 66 supplies the signals decoded by the first or second sound decoding means 62 and 64 to the terminal equipment. . When the selection signal is output, the DTMF signal or the tone signal generated by the DTMF / tone signal generating means 68 is supplied to the terminal device.

As described above, according to the apparatus of the present embodiment,
By transmitting and receiving only the frequency information without transmitting and receiving the DTMF / tone signal to and from the opposite device,
DTMF / tone signals can be transmitted faithfully.
For this reason, according to the speech encoding / decoding device of the present embodiment,
DTMF / tone signals can be reliably transmitted in addition to audio signals and in-band signals.

In the above-described embodiment, the first selector 50 corresponds to the "identification result notifying means" and the "first selector", and the DTMF / tone signal detecting means 54 corresponds to the first selector. 7 corresponds to “DTMF signal detection means”. Further, in the above embodiment, the DTMF / tone signal generating means 68 corresponds to the "DTMF signal generating means" according to the eighth or ninth aspect.

[0042]

Since the present invention is configured as described above, it has the following effects. Claim 1
According to the invention described in the fifth aspect, the audio signal, the in-band signal, and the DTMF signal output from the terminal device can be encoded by a method capable of accurately encoding each signal. Therefore, according to the present invention, it is possible to realize a speech encoding / decoding apparatus capable of accurately outputting a DTMF signal in addition to a speech signal and a signal in a speech band.

According to the second or sixth aspect of the present invention, an encoded signal supplied from another device can be decoded by an appropriate method according to the type. Therefore, according to the present invention, there is provided a speech encoding / decoding apparatus capable of accurately decoding an encoded signal based on a DTMF signal in addition to an encoded signal based on an audio signal or an in-band signal. realizable.

According to the third aspect of the present invention, in addition to the audio signal and the in-band signal, the DTMF signal can be accurately encoded and output, and the audio signal or the in-band signal is used as a basis. In addition to the encoded signal, DT
It is possible to realize a speech encoding / decoding device capable of accurately decoding an encoded signal based on an MF signal.

According to the fourth aspect of the present invention, the voice coding / decoding device on the transmitting side can accurately code and output a voice signal, a signal in a voice band, and a DTMF signal, and output the voice signal on the receiving side. The encoding / decoding device can correctly decode those encoded signals. Therefore, according to the present invention, in addition to the audio signal and the signal in the audio band, D
A system capable of faithfully transmitting a TMF signal can be realized.

According to the invention of claim 7 or 11,
The audio signal output from the terminal device and the signal in the audio band can be encoded by a method capable of accurately encoding each signal, and the D signal output from the terminal device can be encoded.
The frequency information of the TMF signal can be output accurately. Therefore, according to the present invention, it is possible to realize a speech encoding / decoding device capable of accurately outputting the contents of a DTMF signal as well as the contents of a speech signal or a signal in a speech band.

According to the eighth or twelfth aspect of the present invention,
An audio signal supplied from another device or an encoded signal of an in-band signal can be decoded by an appropriate method according to the type, and an appropriate signal can be decoded based on frequency information supplied from another device. A DTMF signal can be generated. Therefore, according to the present invention, it is possible to realize a speech encoding / decoding device capable of accurately supplying the content of a DTMF signal to a terminal device as well as the content of a speech signal or a signal in a speech band.

According to the ninth aspect of the present invention, the voice signal and the signal in the voice band are accurately encoded and the DTMF
Speech coding and decoding capable of accurately outputting frequency information of a signal, accurately decoding a coded signal of a voice signal or a signal in a voice band, and generating a DTMF signal more accurate than the frequency information. The device can be realized.

According to the tenth aspect of the present invention, the voice coding / decoding device on the transmitting side can accurately output the content of the voice signal, the signal in the voice band, and the DTMF signal, and the voice codec on the receiving side The encoding / decoding device can accurately transmit the content to the terminal device. Therefore, according to the present invention, in addition to the audio signal and the signal in the audio band, D
A system capable of faithfully transmitting a TMF signal can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of a speech encoding / decoding device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a speech encoding / decoding device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a conventional speech encoding / decoding device.

[Explanation of symbols]

10; 30; 50 First selector, 12, 32, 5
2 signal identification means, 14; 36; 56 first speech encoding means, 16; 38; 58 second speech encoding means,
18; 42; 60 second selector, 20, 44,
62 first speech decoding means, 22, 46, 64 second
Voice decoding means, 34; 54 DTMF / tone signal detection means, 40 third voice encoding means, 48
Third audio decoding means, 66 Third selector, 68
DTMF / tone signal generating means.

Claims (12)

[Claims] 1. An audio encoding / decoding apparatus which encodes and outputs a signal output from a terminal device, decodes an encoded signal supplied from another device, and supplies the decoded signal to the terminal device. The signal output from is a voice signal, a signal in a voice band, or a signal identification detection means for identifying whether the signal is a DTMF signal, and the identification result of the signal identification detection means to other devices Identification result notifying means, a first audio encoding means for accurately encoding and outputting an in-voice signal, a second audio encoding means for accurately encoding and outputting an audio signal, and a DTMF signal. A third audio encoding unit for accurately encoding and outputting, and a signal in an audio band among the signals output from the terminal equipment according to the identification result of the signal identification detecting unit, the first audio encoding unit Signal An audio encoding / decoding apparatus, comprising: the second audio encoding unit; and a first selector for causing the third audio encoding unit to process a DTMF signal. 2. An audio encoding / decoding apparatus which encodes and outputs a signal output from a terminal device, decodes an encoded signal supplied from another device, and supplies the encoded signal to the terminal device. First audio decoding means for accurately decoding an encoded signal based on the internal signal and outputting the same to a terminal device; and second audio for accurately decoding an encoded signal based on the audio signal and outputting the decoded signal to the terminal device. Decoding means; third speech decoding means for accurately decoding the coded signal based on the DTMF signal and outputting to the terminal equipment; and a speech band based on the identification signal notified together with the coded signal from another apparatus. The encoded signal based on the internal signal is sent to the first audio decoding unit, the encoded signal based on the audio signal is sent to the second audio decoding unit, and the encoded signal based on the DTMF signal is sent to the second audio decoding unit. 3 voice decoding means A second selector for processing, speech coding and decoding apparatus, characterized in that it comprises a. 3. A first speech decoding means for accurately decoding a coded signal based on an in-speech signal and outputting the decoded signal to a terminal device, and a terminal for accurately decoding a coded signal based on a speech signal. A second voice decoding means for outputting to a device; a third voice decoding means for correctly decoding a coded DTMF signal-based signal and outputting to a terminal device; and an identification notified together with the coded signal from another device. Based on the signal, the coded signal based on the in-speech signal is based on the first voice decoding means, the coded signal based on the voice signal is based on the second voice decoding means, and the DTMF signal is based on the DTMF signal. The audio encoding / decoding apparatus according to claim 1, further comprising: a second selector configured to cause the third audio decoding unit to process the encoded signal to be processed. 4. The speech encoding / decoding device according to claim 1,
A speech encoding / decoding system comprising the speech encoding / decoding device according to claim 2 in a network. 5. A speech encoding / decoding method for encoding and outputting a signal output from a terminal device, decoding an encoded signal supplied from another device, and supplying the encoded signal to the terminal device. A step of identifying whether the signal output from the terminal is an audio signal, a signal in an audio band, or a DTMF signal; a step of notifying a result of the identification to another apparatus; If the signal output from the device is a signal in a voice band, processing the signal in a method that can accurately encode and output the signal in the voice band; and the signal output from the terminal device is a voice signal. In some cases,
Processing the audio signal by a method capable of accurately encoding and outputting the signal; and, if the signal output from the terminal device is a DTMF signal, by a method capable of accurately encoding and outputting the DTMF signal. And a signal processing unit. 6. A speech encoding / decoding method for encoding and outputting a signal output from a terminal device, decoding an encoded signal supplied from another device, and supplying the decoded signal to the terminal device. Receiving an identification signal indicating the type of the signal together with the encoded signal from the device; and, based on the identification signal, determining whether the received encoded signal is based on an in-speech signal or based on an audio signal. Or if it is based on a DTMF signal, and if it is determined that a coded signal based on the in-voice signal has been received, the Decoding the underlying coded signal in a manner that can correctly decode the coded signal; and, if it is determined that the coded signal based on the audio signal has been received, the coded signal based on the audio signal. Decoding the signal in a manner that can accurately decode the DTMF signal, and if the encoded signal based on the DTMF signal is determined to have been received, the DTMF signal-based encoded signal can be accurately decoded. Decoding the signal in a method. 7. An audio encoding / decoding apparatus which encodes and outputs a signal output from a terminal apparatus, decodes an encoded signal supplied from another apparatus, and supplies the decoded signal to the terminal apparatus. When the signal output from is a voice signal or a signal in a voice band, a signal identification unit that outputs an identification result indicating a type of the signal, and notifies the identification result of the signal identification unit to another device. Identification result notifying means, first audio encoding means for accurately encoding and outputting an in-speech signal, second audio encoding means for accurately encoding and outputting an audio signal, A first selector that causes the first audio encoding unit to process an in-audio band signal and a second audio encoding unit that processes an audio signal among signals output from the terminal device according to the identification result; DTMF signal detection means for detecting a DTMF signal from a signal output from the device and outputting frequency information of the DTMF signal, comprising: 8. An audio encoding / decoding apparatus which encodes and outputs a signal output from a terminal device, decodes an encoded signal supplied from another device, and supplies the encoded signal to the terminal device. First audio decoding means for accurately decoding an encoded signal based on the internal signal and outputting the same to a terminal device; and second audio for accurately decoding an encoded signal based on the audio signal and outputting the decoded signal to the terminal device. Decoding means, based on an identification signal notified together with the encoded signal from another device, an encoded signal based on the in-speech signal to the first audio decoding means, and a code based on the audio signal. A second selector for causing the second audio decoding means to process the coded signal, and a DTMF signal generator for generating a DTMF signal corresponding to the frequency information when frequency information of the DTMF signal is supplied from another device. When the signal decoded by the first or second audio decoding means,
And a third selector for selectively supplying the DTMF signal generated by the DTMF signal generation means to a terminal device. 9. A first speech decoding means for accurately decoding a coded signal based on an in-speech signal and outputting the coded signal to a terminal device; A second audio decoding means for outputting to an apparatus, and an encoded signal based on an in-speech signal based on an identification signal notified together with the encoded signal from another device to the first audio decoding means. A second selector for processing the encoded signal based on the audio signal by the second audio decoding means, respectively, and when the frequency information of the DTMF signal is supplied from another device, the DTMF signal corresponding to the frequency information is supplied to the second selector. DTMF signal generating means for generating, a signal decoded by the first or second audio decoding means,
The voice encoding / decoding apparatus according to claim 7, further comprising: a third selector that selectively supplies a terminal device with the DTMF signal generated by the DTMF signal generation unit. 10. A speech encoding / decoding system comprising a speech encoding / decoding device according to claim 7 and a speech encoding / decoding device according to claim 8 in a network. 11. A speech encoding / decoding method for encoding and outputting a signal output from a terminal device, decoding an encoded signal supplied from another device, and supplying the decoded signal to the terminal device. When the signal output from is a voice signal or a signal in a voice band, a step of outputting an identification result indicating the type of the signal; a step of notifying the result of the identification to another device; If the signal output from the device is a signal in a voice band, processing the signal in a method that can accurately encode and output the signal in the voice band; and the signal output from the terminal device is a voice signal. In some cases,
Processing the audio signal by a method capable of accurately encoding and outputting the audio signal; and detecting a DTMF signal from the signal output from the terminal device and outputting frequency information of the DTMF signal. A speech encoding / decoding method characterized by the above-mentioned. 12. A speech encoding / decoding method for encoding and outputting a signal output from a terminal device, decoding an encoded signal supplied from another device, and supplying the decoded signal to the terminal device. Receiving an identification signal representing the type of the signal together with the encoded signal from the device; and, based on the identification signal, determining that the received encoded signal is based on an in-speech signal. ,
Decoding the encoded signal based on the in-speech signal in a manner that can accurately decode the signal, and based on the identification signal, the received encoded signal is based on the speech signal. Decoding the coded signal based on the audio signal, if determined, in a manner that can accurately decode the signal; and, if frequency information of the DTMF signal is supplied from another device, the frequency information of the DTMF signal. Generating a DTMF signal corresponding to: and selectively supplying the decoded in-band signal or the decoded audio signal and the generated DTMF signal to a terminal device. Audio encoding and decoding method.