FR2445660A1 - Procede et circuit de transmission de type mic differentiel a prediction adaptive, utilisant un filtrage par sous-bandes et une analyse spectrale - Google Patents
Procede et circuit de transmission de type mic differentiel a prediction adaptive, utilisant un filtrage par sous-bandes et une analyse spectraleInfo
- Publication number
- FR2445660A1 FR2445660A1 FR7836709A FR7836709A FR2445660A1 FR 2445660 A1 FR2445660 A1 FR 2445660A1 FR 7836709 A FR7836709 A FR 7836709A FR 7836709 A FR7836709 A FR 7836709A FR 2445660 A1 FR2445660 A1 FR 2445660A1
- Authority
- FR
- France
- Prior art keywords
- mic
- adaptive prediction
- spectral analysis
- sub
- circuit
- 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
Links
Classifications
-
- 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
- H04B14/066—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using differential modulation with several bits [NDPCM]
- H04B14/068—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using differential modulation with several bits [NDPCM] with adaptive feedback
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M3/00—Conversion of analogue values to or from differential modulation
- H03M3/04—Differential modulation with several bits, e.g. differential pulse code modulation [DPCM]
- H03M3/042—Differential modulation with several bits, e.g. differential pulse code modulation [DPCM] with adaptable step size, e.g. adaptive differential pulse code modulation [ADPCM]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
- H04B1/667—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission using a division in frequency subbands
Abstract
Procédé et dispositif de transmission de type MIC différentiel à prédiction adaptive. Chaque prédiction adaptive s'effectue dans des bandes de fréquences adjacentes sur autant de signaux obtenus par pondération du signal quantifié par des coefficients obtenus par analyse spectrale dans lesdites bandes du signal quantifié. Application aux télécommunications.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7836709A FR2445660A1 (fr) | 1978-12-28 | 1978-12-28 | Procede et circuit de transmission de type mic differentiel a prediction adaptive, utilisant un filtrage par sous-bandes et une analyse spectrale |
US06/103,582 US4319082A (en) | 1978-12-28 | 1979-12-14 | Adaptive prediction differential-PCM transmission method and circuit using filtering by sub-bands and spectral analysis |
CA000342579A CA1155226A (fr) | 1978-12-28 | 1979-12-24 | Methode et circuit de transmission a modulation differentielle par impulsions et codage avec prediction utilisant un filtrage par sous-bandes et par analyse spectrale |
JP16910279A JPS5592049A (en) | 1978-12-28 | 1979-12-25 | Adaptive prenotice pcm transmitting method and circuit utilizing filter ring by sub band and spectrum analysis |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7836709A FR2445660A1 (fr) | 1978-12-28 | 1978-12-28 | Procede et circuit de transmission de type mic differentiel a prediction adaptive, utilisant un filtrage par sous-bandes et une analyse spectrale |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2445660A1 true FR2445660A1 (fr) | 1980-07-25 |
FR2445660B1 FR2445660B1 (fr) | 1981-02-27 |
Family
ID=9216676
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7836709A Granted FR2445660A1 (fr) | 1978-12-28 | 1978-12-28 | Procede et circuit de transmission de type mic differentiel a prediction adaptive, utilisant un filtrage par sous-bandes et une analyse spectrale |
Country Status (4)
Country | Link |
---|---|
US (1) | US4319082A (fr) |
JP (1) | JPS5592049A (fr) |
CA (1) | CA1155226A (fr) |
FR (1) | FR2445660A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0079658A1 (fr) * | 1981-11-17 | 1983-05-25 | Koninklijke Philips Electronics N.V. | Système de transmission à modulation par impulsions codées différentielles |
EP0230001A1 (fr) * | 1985-12-17 | 1987-07-29 | CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. | Procédé et dispositif de codage et de décodage de la parole par analyse de sous-bandes et quantification vectorielle comportant une allocation dynamique de bits |
FR2628589A1 (fr) * | 1988-03-14 | 1989-09-15 | France Etat | Codeur differentiel a filtre predicteur auto-adaptatif et decodeur utilisable en liaison avec un tel codeur |
EP0385799A2 (fr) * | 1989-03-02 | 1990-09-05 | Seiko Instruments Inc. | Procédé pour le traitement d'un signal de parole |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2481026B1 (fr) * | 1980-04-21 | 1984-06-15 | France Etat | |
US4501001A (en) * | 1982-11-04 | 1985-02-19 | Communications Satellite Corporation | Variable slope delta coding processor using adaptive prediction |
US4571737A (en) * | 1982-12-10 | 1986-02-18 | Nec Corporation | Adaptive differential pulse code modulation decoding circuit |
US4516241A (en) * | 1983-07-11 | 1985-05-07 | At&T Bell Laboratories | Bit compression coding with embedded signaling |
CA1208789A (fr) * | 1983-11-25 | 1986-07-29 | Peter E. Chow | Codeur-decodeur mic differentiel adaptatif a reperage ameliore |
IL80103A0 (en) * | 1986-09-21 | 1987-01-30 | Eci Telecom Limited | Adaptive differential pulse code modulation(adpcm)system |
US4792787A (en) * | 1987-02-04 | 1988-12-20 | The United States Of America As Represented By The Secretary Of The Navy | Wide dynamic range analog-to-digital converter using linear prediction |
US4979188A (en) * | 1988-04-29 | 1990-12-18 | Motorola, Inc. | Spectrally efficient method for communicating an information signal |
US5083310A (en) * | 1989-11-14 | 1992-01-21 | Apple Computer, Inc. | Compression and expansion technique for digital audio data |
FR2722631B1 (fr) * | 1994-07-13 | 1996-09-20 | France Telecom Etablissement P | Procede et systeme de filtrage adaptatif par egalisation aveugle d'un signal telephonique numerique et leurs applications |
US20010040927A1 (en) * | 2000-02-17 | 2001-11-15 | Chu Peter L. | Adaptive differential pulse code modulation system and method utilizing whitening filter for updating of predictor coefficients |
FR2834563B1 (fr) * | 2002-01-08 | 2004-04-02 | Thales Sa | Procede de suppression de signaux radioelectriques pulses et dispositif de mise en oeuvre du procede |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3026375A (en) * | 1958-05-09 | 1962-03-20 | Bell Telephone Labor Inc | Transmission of quantized signals |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL165014C (nl) * | 1973-09-03 | 1981-02-16 | Philips Nv | Transmissiestelsel met een zender en een ontvanger voor het met behulp van een pulscode overdragen van informatiesignalen. |
US4017849A (en) * | 1975-08-28 | 1977-04-12 | Bell Telephone Laboratories, Incorporated | Apparatus for analog to digital conversion |
US3973081A (en) * | 1975-09-12 | 1976-08-03 | Trw Inc. | Feedback residue compression for digital speech systems |
US4125861A (en) * | 1977-08-18 | 1978-11-14 | Bell Telephone Laboratories, Incorporated | Video signal encoding |
-
1978
- 1978-12-28 FR FR7836709A patent/FR2445660A1/fr active Granted
-
1979
- 1979-12-14 US US06/103,582 patent/US4319082A/en not_active Expired - Lifetime
- 1979-12-24 CA CA000342579A patent/CA1155226A/fr not_active Expired
- 1979-12-25 JP JP16910279A patent/JPS5592049A/ja active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3026375A (en) * | 1958-05-09 | 1962-03-20 | Bell Telephone Labor Inc | Transmission of quantized signals |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0079658A1 (fr) * | 1981-11-17 | 1983-05-25 | Koninklijke Philips Electronics N.V. | Système de transmission à modulation par impulsions codées différentielles |
EP0230001A1 (fr) * | 1985-12-17 | 1987-07-29 | CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. | Procédé et dispositif de codage et de décodage de la parole par analyse de sous-bandes et quantification vectorielle comportant une allocation dynamique de bits |
FR2628589A1 (fr) * | 1988-03-14 | 1989-09-15 | France Etat | Codeur differentiel a filtre predicteur auto-adaptatif et decodeur utilisable en liaison avec un tel codeur |
EP0334714A1 (fr) * | 1988-03-14 | 1989-09-27 | France Telecom | Codeur différentiel à filtre prédicteur auto adaptatif et décodeur utilisable en liaison avec un tel codeur |
US4939749A (en) * | 1988-03-14 | 1990-07-03 | Etat Francais Represente Par Le Ministre Des Postes Telecommunications Et De L'espace (Centre National D'etudes Des Telecommunications) | Differential encoder with self-adaptive predictive filter and a decoder suitable for use in connection with such an encoder |
EP0385799A2 (fr) * | 1989-03-02 | 1990-09-05 | Seiko Instruments Inc. | Procédé pour le traitement d'un signal de parole |
EP0385799A3 (fr) * | 1989-03-02 | 1991-04-17 | Seiko Instruments Inc. | Procédé pour le traitement d'un signal de parole |
Also Published As
Publication number | Publication date |
---|---|
CA1155226A (fr) | 1983-10-11 |
FR2445660B1 (fr) | 1981-02-27 |
JPS5592049A (en) | 1980-07-12 |
US4319082A (en) | 1982-03-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |