Title (en)

Voice coders

Title (de)

Sprachkodierer

Title (fr)

Codeurs de voix

Publication

EP 0689189 A1 19951227 (EN)

Application

EP 95108870 A 19950608

Priority

IT MI941283 A 19940620

Abstract (en)

The invention relates to a method of improving the features of voice encoders based on linear prediction and analysis-by-synthesis techniques making use of an objective function to minimize. This objective function comprises jointly or alternately the free evolution of the objective signal and of the synthetic signal and a weighing with respect to the error between the prediction residue and the synthetic excitation. <IMAGE>

IPC 1-7

G10L 3/00; G10L 9/14; G10L 3/02; G10L 9/18

IPC 8 full level

G10L 19/083 (2013.01); G10L 19/12 (2013.01)

CPC (source: EP)

G10L 19/083 (2013.01); G10L 19/12 (2013.01)

Citation (applicant)

• P. KROON, E.F. DEPRETTERE: "A class of analysis-by-synthesis predictive coders for high quality speech coding at rates between 4.8 and 16 Kbit/s", IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, vol. 6, no. 2, February 1988 (1988-02-01), pages 353 - 363
• "Proc. ICASSP '85 (International Conference on Acoustics, Speech and Signal Processing)", article M.R. SCHROEDER, B.S. ATAL: "Code Excited Linear Prediction (CELP): high-quality speech at very low bit rates", pages: 26 - 29
• "Proc. ICASSP '88 (International Conferences on Acoustics, Speech and Signal Processing)", article W.B. KLEIJN, D.J. KRASINSKI, R.H. KETCHUM: "Improved Speech Quality and Efficient Vector Quantization in SELP", pages: 155 - 158

Citation (search report)

• [A] EP 0516439 A2 19921202 - MOTOROLA INC [US]
• [A] EP 0515138 A2 19921125 - NOKIA MOBILE PHONES LTD [FI]
• [A] EP 0465057 A1 19920108 - AMERICAN TELEPHONE & TELEGRAPH [US]

Designated contracting state (EPC)

DE FR GB IT

DOCDB simple family (publication)

EP 0689189 A1 19951227; EP 0689189 B1 19990922; AU 2175395 A 19960104; AU 698340 B2 19981029; DE 69512323 D1 19991028; DE 69512323 T2 20000706; IT 1271182 B 19970527; IT MI941283 A0 19940620; IT MI941283 A1 19951220

DOCDB simple family (application)

EP 95108870 A 19950608; AU 2175395 A 19950620; DE 69512323 T 19950608; IT MI941283 A 19940620