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WO1999001941A1 - Dispositif de transmission d'un signal vocal code micda - Google Patents

Dispositif de transmission d'un signal vocal code micda Download PDF

Info

Publication number
WO1999001941A1
WO1999001941A1 PCT/ES1998/000161 ES9800161W WO9901941A1 WO 1999001941 A1 WO1999001941 A1 WO 1999001941A1 ES 9800161 W ES9800161 W ES 9800161W WO 9901941 A1 WO9901941 A1 WO 9901941A1
Authority
WO
WIPO (PCT)
Prior art keywords
voice signal
differentially
bits
packets
error detection
Prior art date
Application number
PCT/ES1998/000161
Other languages
English (en)
Spanish (es)
Inventor
Belén Ruiz Mezcua
Mariano Perez Abadia
Mª Isabel LOPEZ CARRILLO
Original Assignee
Alcatel Alsthom - Compagnie Generale D'electricite
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 Alcatel Alsthom - Compagnie Generale D'electricite filed Critical Alcatel Alsthom - Compagnie Generale D'electricite
Priority to AU76552/98A priority Critical patent/AU7655298A/en
Publication of WO1999001941A1 publication Critical patent/WO1999001941A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/06—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation

Definitions

  • the present invention relates to the transmission of voice in a noisy environment, for example in a radio system with mobile terminals. More precisely, the invention relates to devices for attenuating the reception of received voice sequences, or replacing these voice sequences with comfort sequences, when the quality of said voice sequences is very weak for the user.
  • the word "mutmg" is used to define these techniques.
  • the document describes a muting solution that is applied to the PCM signal based on errors detected using error detection codes of the CRC type transmitted together with the ADPCM signal, however, the solution described in this document does not solve the problem of the occurrence of click noise that causes a disturbance, very unpleasant to the user, of the original voice signal for a long duration Although the described solution improves the subjective quality of the voice as it is received by the user, the initial disturbance is wide signed in time by the solution of this document.
  • a first objective of the invention is to propose a device for transmitting an ADPCM encoded voice signal that allows to increase the subjective quality of the voice as it is received by a user.
  • a second objective of the invention is to propose a receiving device of this ADPCM encoded voice signal as it is sent from the transmission device in order to retrieve a good ⁇ -voice signal of sub-objective quality.
  • a transmission device for transmitting successive packets of voice signal bits comprising differential encoding means for differentially encoding said speech signal bit packets is characterized in accordance with the invention because it comprises means for generating a code of error detection for each differentially coded voice signal bit packet, in order to detect errors in the transmission of said differentially coded voice signal packets in a remote receiving device.
  • a receiving device for receiving successive bit packets of differentially encoded voice signal from a device defined above is characterized in that it comprises means for detecting a error in a differentially encoded packet based on its associated error detection code, and means for applying a at least partial reception deactivation algorithm of the corresponding differentially decoded signal
  • FIG. 2 shows a receiving device according to the invention
  • FIG. 3 shows a data signal as transmitted from the device of figure 1 to the device of figure 2.
  • a differentially encoded voice signal transmission device comprises a PCM (Pulse Coding Moduiation) encoder 10, an ADPCM (Adaptive Differential Pulse Coding Modulation) 11 encoder, a circuit of Generation of error detection code 12 and a multiplexer 13.
  • the input signal S (t) is an analog voice signal as it is received from a microphone for example.
  • This signal S (t) is applied to an input of the PCM encoder 10 that samples this signal and transforms each sampling into a N bit word, N being for example equal to 8.
  • the resulting N bit word is applied to an input of the ADPCM encoder 11, well known in the state of the art, which produces a differentially encoded word.
  • the code produced by circuit 12 and the words produced by ADPCM encoder 11 are multiplexed in multipiexor 13 to produce a signal as shown in Figure 3.
  • This signal of Figure 3 alternatively comprises a differentially encoded word and a redundancy bit R of the total code for error detection.
  • R redundancy bit
  • the error detection code noted “RRRR”
  • the remote unit includes a demultipiexor 20, an error detection circuit 21, an ADPCM decoder 22 and a muting unit 23.
  • the signal received by the remote unit from the local unit is in the form of the signal shown in Figure 3.
  • the demultiplexer 20 applies the voice bits to the decoder 22, and both the voice bits D and the error detection bits R to the error detection circuit 21.
  • the unit 22 applies an algorithm that attenuates, that is partially deactivated, the reception of the decoded received voice sequence, or replaces this voice sequence with a comfort sequence, or carries out another treatment
  • any other type of more complex algorithm can be used in unit 23.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Theoretical Computer Science (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

L'invention concerne un dispositif de transmission permettant de transmettre, par exemple par radio, des paquets de bits successifs de signal vocal. Le dispositif comprend des moyens de codage différentiel (11) pour coder de manière différentielle lesdits paquets de bits de signal vocal. Le dispositif est caractérisé en ce qu'il comprend des moyens (12) destinés à générer un code de détection d'erreur (R) pour chaque paquet de bits de signal vocal codé de manière différentielle, afin de détecter dans un dispositif récepteur à distance des erreurs lors de la transmission desdits paquets de signal vocal codés de manière différentielle. Ce code de détection d'erreur prend uniquement en charge les bits le plus significatifs dudit paquet codé de manière différentielle.
PCT/ES1998/000161 1997-07-02 1998-06-04 Dispositif de transmission d'un signal vocal code micda WO1999001941A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU76552/98A AU7655298A (en) 1997-07-02 1998-06-04 Device for transmitting a coded adpcm voice signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9701467 1997-07-02
ESP9701467 1997-07-02

Publications (1)

Publication Number Publication Date
WO1999001941A1 true WO1999001941A1 (fr) 1999-01-14

Family

ID=8299919

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ES1998/000161 WO1999001941A1 (fr) 1997-07-02 1998-06-04 Dispositif de transmission d'un signal vocal code micda

Country Status (2)

Country Link
AU (1) AU7655298A (fr)
WO (1) WO1999001941A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988010035A1 (fr) * 1987-06-04 1988-12-15 Motorola, Inc. Protection d'informations relatives au niveau d'energie dans un codage par bandes subdivisees
EP0422802A1 (fr) * 1989-10-12 1991-04-17 Stc Plc Dispositif de codage/décodage de parole
US5073940A (en) * 1989-11-24 1991-12-17 General Electric Company Method for protecting multi-pulse coders from fading and random pattern bit errors
WO1993005502A1 (fr) * 1991-09-05 1993-03-18 Motorola, Inc. Systeme de protection contre les erreurs destine a des codeurs de signaux vocaux multimodes
WO1993015502A1 (fr) * 1992-01-28 1993-08-05 Qualcomm Incorporated Procede et systeme servant a l'agencement de donnees de vocodeur dans le but de masquer des erreurs provoquees par le canal de transmission
US5309443A (en) * 1992-06-04 1994-05-03 Motorola, Inc. Dynamic muting method for ADPCM coded speech
GB2291570A (en) * 1994-07-21 1996-01-24 Matsushita Electric Ind Co Ltd Adaptive error correcting device
WO1996009700A1 (fr) * 1994-09-19 1996-03-28 Motorola Inc. Procede et appareil d'attenuation d'erreur dans un signal de communication reçu
US5517511A (en) * 1992-11-30 1996-05-14 Digital Voice Systems, Inc. Digital transmission of acoustic signals over a noisy communication channel
US5615222A (en) * 1994-02-04 1997-03-25 Pacific Communication Sciences, Inc. ADPCM coding and decoding techniques for personal communication systems

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988010035A1 (fr) * 1987-06-04 1988-12-15 Motorola, Inc. Protection d'informations relatives au niveau d'energie dans un codage par bandes subdivisees
EP0422802A1 (fr) * 1989-10-12 1991-04-17 Stc Plc Dispositif de codage/décodage de parole
US5073940A (en) * 1989-11-24 1991-12-17 General Electric Company Method for protecting multi-pulse coders from fading and random pattern bit errors
WO1993005502A1 (fr) * 1991-09-05 1993-03-18 Motorola, Inc. Systeme de protection contre les erreurs destine a des codeurs de signaux vocaux multimodes
WO1993015502A1 (fr) * 1992-01-28 1993-08-05 Qualcomm Incorporated Procede et systeme servant a l'agencement de donnees de vocodeur dans le but de masquer des erreurs provoquees par le canal de transmission
US5309443A (en) * 1992-06-04 1994-05-03 Motorola, Inc. Dynamic muting method for ADPCM coded speech
US5517511A (en) * 1992-11-30 1996-05-14 Digital Voice Systems, Inc. Digital transmission of acoustic signals over a noisy communication channel
US5615222A (en) * 1994-02-04 1997-03-25 Pacific Communication Sciences, Inc. ADPCM coding and decoding techniques for personal communication systems
GB2291570A (en) * 1994-07-21 1996-01-24 Matsushita Electric Ind Co Ltd Adaptive error correcting device
WO1996009700A1 (fr) * 1994-09-19 1996-03-28 Motorola Inc. Procede et appareil d'attenuation d'erreur dans un signal de communication reçu

Also Published As

Publication number Publication date
AU7655298A (en) 1999-01-25

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