JPH05191362A - Digital voice communication method - Google Patents

Digital voice communication method

Info

Publication number
JPH05191362A
JPH05191362A JP451292A JP451292A JPH05191362A JP H05191362 A JPH05191362 A JP H05191362A JP 451292 A JP451292 A JP 451292A JP 451292 A JP451292 A JP 451292A JP H05191362 A JPH05191362 A JP H05191362A
Authority
JP
Japan
Prior art keywords
voice
control signal
bit
bits
important
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP451292A
Other languages
Japanese (ja)
Other versions
JP3120523B2 (en
Inventor
Nobuo Asano
延夫 浅野
Osamu Kato
修 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP04004512A priority Critical patent/JP3120523B2/en
Publication of JPH05191362A publication Critical patent/JPH05191362A/en
Application granted granted Critical
Publication of JP3120523B2 publication Critical patent/JP3120523B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Time-Division Multiplex Systems (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Error Detection And Correction (AREA)

Abstract

PURPOSE:To reduce the deterioration in decoding voice quality at steal of a control signal in the voice communication used for digital communication field. CONSTITUTION:When a control signal steals a voice signal, an important bit 5 featuring especially the voice signal is left in the voice decoding and other bits are replaced into the control signal to form a frame and it is transmitted. A receiver side substitutes the stolen bits with a random number and the voice is decoded together with the received important bit to reduce the deterioration in the voice quality.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、ディジタル通信に利用
するディジタル音声通信方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital voice communication method used for digital communication.

【0002】[0002]

【従来の技術】図2は従来のディジタル音声通信方法を
説明するための図である。図2において、1は音声チャ
ネル(TCH)フレーム、3は付随制御チャネル(FA
CCH)フレームである。
2. Description of the Related Art FIG. 2 is a diagram for explaining a conventional digital voice communication method. In FIG. 2, 1 is a voice channel (TCH) frame and 3 is an associated control channel (FA).
CCH) frame.

【0003】次に上記従来例の方法について説明する。
図2において、送信側で音声を数十msの音声フレーム
単位で情報源符号化を行って得られる音声パラメータ
(Nc1+Nc2)ビットのデータと同期ワードなどNw
ットのデータから音声チャネルフレーム1を構成し、ト
ラフィックチャネル(TCH)として伝送し、受信側で
音声復号を行い音声を得る。音声通信中に付随制御信号
(FACCH)を伝送する必要のあるときは、音声パラ
メータの部分をFACCHデータに置き換え(スチール
し)付随制御チャネルフレーム3を構成して伝送し、受
信側ではCRCチェック等を行うことによりFACCH
であることを認識し制御データを得る。一方、スチール
されたときの音声復号は正常には行えず、前音声フレー
ムで使用した音声パラメータを使用するなどして補間処
理を施し音声を出力する。
Next, the method of the conventional example will be described.
In FIG. 2, a voice channel frame is obtained from N w -bit data such as voice parameter (N c1 + N c2 ) bit data obtained by performing source coding of voice on the transmission side in units of a voice frame of several tens ms. 1 is configured and transmitted as a traffic channel (TCH), and voice decoding is performed on the receiving side to obtain voice. When it is necessary to transmit the associated control signal (FACCH) during voice communication, the voice parameter portion is replaced (stealed) with the FACCH data to form the associated control channel frame 3 and transmitted, and the receiving side performs CRC check, etc. FACCH
And obtain control data. On the other hand, the voice decoding at the time of stealing cannot be normally performed, and the voice is used after performing the interpolation process by using the voice parameter used in the previous voice frame.

【0004】このようにして、上記従来のディジタル音
声通信方法でもFACCHにスチールされても補間処理
を行い途切れることなく音声出力を得ることができる。
In this way, even in the above conventional digital voice communication method, even if the FACCH is stolen, the interpolation process is performed and the voice output can be obtained without interruption.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、上記従
来のディジタル音声通信方法では、FACCHにスチー
ルされたときその音声フレームの情報がまったく欠落す
るため、音声品質劣化は避けられないという問題があっ
た。
However, the above-mentioned conventional digital voice communication method has a problem that deterioration of voice quality is unavoidable because information of the voice frame is completely lost when stolen by the FACCH.

【0006】本発明はこのような従来の問題を解決する
ものであり、FACCHがTCHをスチールするとき、
音声復号で特に音声を特徴づける重要なビットは残し、
それ以外のビットをFACCHに置き換えることによ
り、スチール時の音声品質劣化を軽減することを目的と
するものである。
The present invention solves such a conventional problem. When the FACCH steals the TCH,
The important bits that characterize speech in speech decoding are retained,
By replacing the other bits with FACCH, it is intended to reduce voice quality deterioration at the time of stealing.

【0007】[0007]

【課題を解決するための手段】本発明は上記目的を達成
するために、FACCHがTCHをスチールするとき、
音声復号で特に音声を特徴づける重要なビットは残し、
それ以外のビットをFACCHに置き換えてフレームを
構成し、伝送するようにしたものである。
In order to achieve the above-mentioned object, the present invention provides: when FACCH steals TCH,
The important bits that characterize speech in speech decoding are retained,
The other bits are replaced with FACCH to form a frame for transmission.

【0008】[0008]

【作用】上記のフレーム構成をもつ本発明によれば、F
ACCHがTCHをスチールするとき、音声復号で特に
音声を特徴づける重要なビットは残し、それ以外のビッ
トをFACCHに置き換えてフレームを構成し伝送する
ことによって、受信側ではスチールされたビットに対し
ては乱数などで代用し、受信した重要ビットとともに音
声復号することができ、スチール時の音声品質劣化を軽
減できる。
According to the present invention having the above frame structure, F
When the ACCH steals the TCH, the important bits that characterize the speech are left in the speech decoding, and the other bits are replaced with the FACCH to construct and transmit the frame, so that the receiving side can recognize the stolen bits. Can be used as a substitute for random numbers and can be used for voice decoding together with the received important bits, which can reduce voice quality deterioration during stealing.

【0009】[0009]

【実施例】図1は本発明の一実施例を説明するための図
である。図1において、1は音声チャネル(TCH)フ
レーム、2は音声チャネル(TCH)・付随制御チャネ
ル(FACCH)混在フレームであり、4は同期ワード
その他のデータ、5は音声パラメータの重要ビットのデ
ータ、6は音声パラメータの準重要ビットのデータ、7
はFACCHのデータである。
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining one embodiment of the present invention. In FIG. 1, 1 is a voice channel (TCH) frame, 2 is a voice channel (TCH) / accompanying control channel (FACCH) mixed frame, 4 is synchronization word and other data, 5 is data of important bit of voice parameter, 6 is the data of the semi-important bit of the voice parameter, 7
Is FACCH data.

【0010】次に上記実施例の方法について説明する。
図1において、送信側で音声を数十msの音声フレーム
単位で情報源符号化を行って得られる音声パラメータ
(Nc1+Nc2)ビットのデータと同期ワードなどNw
ットのデータとで音声チャネルフレーム1を構成し、ト
ラフィックチャネル(TCH)として伝送し、受信側で
音声復号を行い音声を得る。音声通信中に付随制御信号
(FACCH)を伝送する必要のあるときは、音声パラ
メータのうち特に音声を特徴づける重要なNc1ビットは
そのまま残し、たとえば残差パラメータなどの準重要な
c2ビットをFACCHデータに置き換え(スチール
し)、音声チャネル(TCH)と付随制御チャネル(F
ACCH)との混在フレーム2を構成し、伝送する。ス
チールされたNc2ビットのうちFACCHで使用する残
余のビットは誤り検出用の冗長ビット(CRC)を付加
する。受信側ではCRCチェック(符号冗長度検定)等
の検出を行うことによりFACCHであることを認識し
制御データを得る。一方スチールされたときの音声復号
は受信したNc1ビットと受信側で乱数などを使用して生
成したNc2ビットを用いて行い、音声を出力する。
Next, the method of the above embodiment will be described.
In FIG. 1, a voice channel is composed of voice parameter (N c1 + N c2 ) bit data and N w bit data such as a synchronization word obtained by performing source coding of voice on the transmission side in units of a voice frame of several tens ms. Frame 1 is configured and transmitted as a traffic channel (TCH), and voice decoding is performed on the receiving side to obtain voice. When an accompanying control signal (FACCH) needs to be transmitted during voice communication, important N c1 bits that characterize the voice among the voice parameters are left as they are, and quasi important N c2 bits such as a residual parameter are left as they are. Replaced with FACCH data (steal), voice channel (TCH) and associated control channel (F
ACCH) and mixed frame 2 are configured and transmitted. Redundant bits (CRC) for error detection are added to the remaining bits used in FACCH among the stolen N c2 bits. The receiving side recognizes the FACCH by detecting CRC check (code redundancy test) or the like, and obtains control data. On the other hand, the voice decoding when stolen is performed using the received N c1 bit and the N c2 bit generated by using a random number or the like on the receiving side, and outputs the voice.

【0011】このように上記実施例によれば、FACC
HがTCHをスチールするとき、音声復号で特に音声を
特徴づける重要なビットは残し、それ以外のビットをF
ACCHに置き換えてフレームを構成し伝送することに
よって、受信側ではスチールされたビットに対しては乱
数などで代用し、受信した重要ビットとともに音声復号
することができ、スチール時の音声品質劣化を軽減する
ことができる。
Thus, according to the above embodiment, the FACC
When H steals TCH, it leaves important bits that characterize speech especially in speech decoding and leaves the other bits in F.
By replacing the ACCH with a frame and transmitting it, the receiving side can substitute a stolen bit with a random number, etc., and can perform voice decoding with the received important bit, reducing voice quality deterioration during stealing. can do.

【0012】[0012]

【発明の効果】本発明は上記実施例より明らかなよう
に、FACCHがTCHをスチールするときの音声品質
劣化を軽減するという効果を有する。
As is apparent from the above embodiment, the present invention has the effect of reducing voice quality deterioration when the FACCH steals the TCH.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の第1の実施例におけるディジタル音声
通信信号の構成を説明する図
FIG. 1 is a diagram illustrating a configuration of a digital voice communication signal according to a first embodiment of the present invention.

【図2】従来のディジタル音声通信方法における信号の
構成を説明する図
FIG. 2 is a diagram illustrating a signal configuration in a conventional digital voice communication method.

【符号の説明】[Explanation of symbols]

1 音声チャネルフレーム(トラフィックチャネル) 2 音声チャネル・付随制御チャネル混在フレーム 4 同期ワードその他のデータ(同期ワードなどNw
ットのデータ) 5 音声パラメータの重要ビットのデータ(音声パラメ
ータのうち特に重要であるNc1ビット) 6 音声パラメータの準重要ビットのデータ(準重要で
あるNc2ビット) 7 FACCHのデータ(付随制御信号)
1 voice channel frame (traffic channel) 2 voice channel / associated control channel mixed frame 4 sync word other data (N w bit data such as sync word) 5 important bit data of voice parameter (especially important among voice parameters N c1 bit) 6 voice parameter semi-important bit data (quasi-important N c2 bit) 7 FACCH data (associated control signal)

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】アナログ音声信号を一定の周期をもつ音声
フレームで情報源符号化を行って得られる音声パラメー
タ(Nc1+Nc2)ビットのデータと同期ワードなどNw
ビットのデータとでフレームを構成し、トラフィックチ
ャネルとして伝送する通信方法において、音声通信中に
付随制御信号を伝送する必要のあるときに、送信側では
情報源符号化を行って得られる音声パラメータのうち特
に重要であるNc1ビットはそのままにし、準重要である
c2ビットを前記付随制御信号に置き換えて伝送し、受
信側ではNc2ビットの誤り検出を行って付随制御信号と
認めたときは、前記付随制御信号を復号するとともに、
音声復号に関しては付随制御信号に置き換えられたNc2
ビットを補間し、重要であるNc1ビットとともに復号を
行い出力するディジタル音声通信方法。
1. A speech obtained by performing information source coding the analog voice signal by the voice frames with a constant cycle parameters (N c1 + N c2) of the bit data and the synchronization word such as N w
In the communication method of forming a frame with bit data and transmitting it as a traffic channel, when it is necessary to transmit an accompanying control signal during voice communication, the transmitter side performs the source parameter encoding of the voice parameter. Among them, N c1 bit which is particularly important is left as it is, N c2 bit which is semi-important is replaced with the associated control signal and transmitted, and when the receiving side performs error detection of N c2 bit and recognizes it as the associated control signal, , While decoding the associated control signal,
For voice decoding, N c2 replaced by the associated control signal
A digital voice communication method in which bits are interpolated and decoded together with the important N c1 bits to be output.
JP04004512A 1992-01-14 1992-01-14 Digital voice communication method Expired - Fee Related JP3120523B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP04004512A JP3120523B2 (en) 1992-01-14 1992-01-14 Digital voice communication method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP04004512A JP3120523B2 (en) 1992-01-14 1992-01-14 Digital voice communication method

Publications (2)

Publication Number Publication Date
JPH05191362A true JPH05191362A (en) 1993-07-30
JP3120523B2 JP3120523B2 (en) 2000-12-25

Family

ID=11586110

Family Applications (1)

Application Number Title Priority Date Filing Date
JP04004512A Expired - Fee Related JP3120523B2 (en) 1992-01-14 1992-01-14 Digital voice communication method

Country Status (1)

Country Link
JP (1) JP3120523B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999062181A1 (en) * 1998-05-27 1999-12-02 Ntt Mobile Communications Network Inc. Error protecting method and error protective device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999062181A1 (en) * 1998-05-27 1999-12-02 Ntt Mobile Communications Network Inc. Error protecting method and error protective device
US6434718B1 (en) 1998-05-27 2002-08-13 Ntt Docomo Inc. Error protection method and error protection device

Also Published As

Publication number Publication date
JP3120523B2 (en) 2000-12-25

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