Global Patent Index - EP 0454552 A3

EP 0454552 A3 19920102 - METHOD AND APPARATUS FOR LOW BITRATE SPEECH CODING

Title (en)

METHOD AND APPARATUS FOR LOW BITRATE SPEECH CODING

Publication

EP 0454552 A3 19920102 (FR)

Application

EP 91401051 A 19910419

Priority

FR 9005400 A 19900427

Abstract (en)

[origin: EP0454552A2] The method involves dividing up the speech signal into frames of a constant length, calculating (4...10) the characteristics of N vocal duct modeling filters and the pitch, voicing and energy characteristics of the speech signal. Block coding is performed both for the filters and for the pitch and voicing. The speech signal energy is determined P times per frame for N frames and coded in a single block. Applications: low-speed 800 bits/sec vocoders.

IPC 1-7

G10L 9/14

IPC 8 full level

G10L 19/07 (2013.01)

CPC (source: EP)

G10L 19/07 (2013.01)

Citation (search report)

  • [E] EP 0428445 A1 19910522 - THOMSON CSF [FR]
  • [A] US 4701955 A 19871020 - TAGUCHI TETSU [JP]
  • [A] US 4852179 A 19890725 - FETTE BRUCE A [US]
  • [X] 1977 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH & SIGNAL PROCESSING, Hartford, Connecticut, 9-11 mai 1977, pages 219-222, IEEE, New York, US; R. VISWANATHAN et al.: "The application of a functional perceptual model of speech to variable-rate LPC systems"
  • [X] ICASSP '83 - IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING, Boston, 14-16 avril 1983, vol. 1, pages 69-72, IEEE, New York, US; R.M. SCHWARTZ et al.: "A comparison of methods for 300-400 B/S vocoders"
  • [A] 1978 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH & SIGNAL PROCESSING, Tulsa, Oklahoma, 10-12 avril 1978, pages 458-461, IEEE, New York, US; E. McLARNON: "A method for reducing the transmission rate of a channel vocoder by using frame interpolation"

Designated contracting state (EPC)

DE ES GB IT

DOCDB simple family (publication)

EP 0454552 A2 19911030; EP 0454552 A3 19920102; CA 2079884 A1 19911028; FR 2661541 A1 19911031; JP H05507796 A 19931104; WO 9117541 A1 19911114

DOCDB simple family (application)

EP 91401051 A 19910419; CA 2079884 A 19910419; FR 9005400 A 19900427; FR 9100329 W 19910419; JP 50875691 A 19910419