EP 1129451 A1 20010905 - CLOSED-LOOP VARIABLE-RATE MULTIMODE PREDICTIVE SPEECH CODER
Title (en)
CLOSED-LOOP VARIABLE-RATE MULTIMODE PREDICTIVE SPEECH CODER
Title (de)
MULTIMODALER PRÄDIKTIONSSPRACHKODIERER MIT REGELSCHLEIFE UND VERÄNDERLICHER DATENRATE
Title (fr)
MODELE EN BOUCLE DE CODEUR DE LA PAROLE PREDICTIF, MULTIMODE ET A DEBIT VARIABLE
Publication
Application
Priority
- US 9926850 W 19991112
- US 19164398 A 19981113
Abstract (en)
[origin: WO0030075A1] A closed-loop, multimode, predictive speech coder includes a codec (100, 200) configured to operate in any of several coding modes, and a closed-loop mode decision module configured to apply a lowest-bit-rate coding mode to an input speech frame. A performance measure of the codec is obtained and compared with a threshold value. If the performance measure does not exceed the threshold value, the lowest-bit-rate coding mode is rejected in favor of a coding mode with a higher bit rate. The process can be continued until the coding performance is satisfactory. A higher-bit-rate, direct coding mode may be applied after a lower-bit-rate, prediction-based coding mode has failed to perform satisfactorily.
IPC 1-7
IPC 8 full level
G10L 19/18 (2013.01); H03M 7/36 (2006.01)
CPC (source: EP KR)
G10L 19/18 (2013.01 - EP KR); G10L 19/24 (2013.01 - KR)
Citation (search report)
See references of WO 0030075A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 0030075 A1 20000525; AU 1524300 A 20000605; EP 1129451 A1 20010905; JP 2002530706 A 20020917; KR 20010087393 A 20010915
DOCDB simple family (application)
US 9926850 W 19991112; AU 1524300 A 19991112; EP 99957560 A 19991112; JP 2000583004 A 19991112; KR 20017006035 A 20010512