Global Patent Index - EP 0347307 A3

EP 0347307 A3 19901227 - CODING METHOD AND LINEAR PREDICTION SPEECH CODER

Title (en)

CODING METHOD AND LINEAR PREDICTION SPEECH CODER

Publication

EP 0347307 A3 19901227 (FR)

Application

EP 89401644 A 19890613

Priority

FR 8807846 A 19880613

Abstract (en)

[origin: EP0347307A2] The method, usable in particular for low-rate speech transmission, uses vector excitation. A signal frame is represented, on the one hand, by prediction parameters, and on the other hand, by a succession of excitation vectors contained in a dictionary (20) and by amplification gains (Gk) of these vectors, the vectors adopted being determined by searching for the minimum energy of an error signal obtained by subtraction of each vector in its turn, after having submitted to a filtering, from the frame of the speech signal. Before subtraction: each frame of the speech signal is subjected to a short-term analysis filtering and to a weighted synthesis filtering, with coefficients possibly fixed in time, and the amplified vector is subjected to a long-term predictive filtering and to the same perceptual weighted synthesis filtering as the speech signal. <IMAGE>

IPC 1-7

G10L 9/14

IPC 8 full level

G10L 19/005 (2013.01); G10L 19/113 (2013.01); G10L 25/06 (2013.01)

CPC (source: EP)

G10L 19/005 (2013.01); G10L 19/113 (2013.01); G10L 25/06 (2013.01); G10L 2019/0003 (2013.01); G10L 2019/0014 (2013.01)

Citation (search report)

  • [XP] WO 8902147 A1 19890309 - BRITISH TELECOMM [GB]
  • [XP] ELECTRONICS LETTERS, vol. 25, no. 6, 16 mars 1989, pages 401-403, Stevenage GB; R.A. SALAMI: "Binary code excited linear prediction (BCELP): new approach to CELP coding of speech without codebooks"
  • [AD] PROCEEDINGS: ICASSP'87 - 1987 INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, 6-9 avril 1987, Dallas, Texas, vol. 4, pages 1957-1960, IEEE, New York, US; J.-P. ADOUL et al.: "Fast CELP coding based on algebraic codes"
  • [A] ICASSP'86 PROCEEDINGS - IEEE-IECEJ-ASJ INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSNG, 7-11 avril 1986, Tokyo, vol. 4, pages 3055-3058, IEEE, New York, US; G. DAVIDSON et al.: "Complexity reduction methods for vector excitation coding"
  • [A] ICASSP'85 PROCEEDINGS - IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, 26-29 mars 1985, Tampa, Florida, vol. 3, pages 965-968, IEEE, New York, US; E.F. DEPRETTERE et al.: "Regular excitation reduction for effective and efficient LP-coding of speech"

Designated contracting state (EPC)

DE ES GB IT

DOCDB simple family (publication)

EP 0347307 A2 19891220; EP 0347307 A3 19901227; EP 0347307 B1 19940504; DE 68915057 D1 19940609; DE 68915057 T2 19940818; ES 2052043 T3 19940701; FR 2632758 A1 19891215; FR 2632758 B1 19910607

DOCDB simple family (application)

EP 89401644 A 19890613; DE 68915057 T 19890613; ES 89401644 T 19890613; FR 8807846 A 19880613