EP 0608174 B1 19980812 - System for predictive encoding/decoding of a digital speech signal by an adaptive transform with embedded codes
Title (en)
System for predictive encoding/decoding of a digital speech signal by an adaptive transform with embedded codes
Title (de)
System zur prädiktiven Kodierung/Dekodierung eines digitalen Sprachsignals mittels einer adaptiven Transformation mit eingebetteten Kodes
Title (fr)
Systeme de codage-décodage prédictif d'un signal numérique de parole par transformée adaptative à codes imbriqués
Publication
Application
Priority
FR 9300601 A 19930121
Abstract (en)
[origin: EP0608174A1] The invention relates to a system for the predictive encoding of a digital speech signal with embedded codes. The encoded digital signal (Sn) is formed by an encoded speech signal and, if appropriate, by auxiliary data. A perceptual weighting filter (11) is formed by a filter for short-term prediction of the speech signal to be encoded so as to produce a frequency distribution of the quantisation noise. A circuit (12) makes it possible to subtract from the perceptual signal @, the contribution from the past excitation signal @ so as to deliver an updated perceptual signal Pn. A long-term prediction circuit (13) is formed, as a closed loop, from a dictionary updated with the past excitation @ modeled for the lowest throughput and enables an optimal wave form and an associated estimated gain @ to be delivered. An orthonormal transform module (MT) includes an adaptive transform module (14) and a module (16) for progressive modelling by orthogonal vectors, this making it possible to deliver indices representing the encoded speech signal. A circuit (19) allows the insertion of auxiliary data through bit stealing from the encoded speech signal. Application to any transmission system and to the storage of speech signals. <IMAGE>
IPC 1-7
IPC 8 full level
G10L 19/02 (2013.01)
CPC (source: EP US)
G10L 19/0212 (2013.01 - EP US); G10L 2019/0002 (2013.01 - EP US); G10L 2019/0003 (2013.01 - EP US); G10L 2019/0005 (2013.01 - EP US); G10L 2019/0011 (2013.01 - EP US)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 0608174 A1 19940727; EP 0608174 B1 19980812; DE 69412294 D1 19980917; DE 69412294 T2 19990415; FR 2700632 A1 19940722; FR 2700632 B1 19950324; US 5583963 A 19961210
DOCDB simple family (application)
EP 94400109 A 19940118; DE 69412294 T 19940118; FR 9300601 A 19930121; US 18418694 A 19940121