EP 0619574 A1 19941012 - Speech coder employing analysis-by-synthesis techniques with a pulse excitation.
Title (en)
Speech coder employing analysis-by-synthesis techniques with a pulse excitation.
Title (de)
Sprachkodierer mit Analyse-durch Synthese-Technik und Pulsanregung.
Title (fr)
Codeur de langage utilisant des techniques d'analyse par synthèse avec excitation d'impulsion.
Publication
Application
Priority
IT TO930244 A 19930409
Abstract (en)
In an analysis-by-synthesis coder, the original speech signal undergoes small time shifts to match in time the signal to be coded with the replica produced by the long term synthesis filter. The shift is determined at each subframe by an exhaustive search within a range of possible values so as to minimize the error signal energy. Once the optimal shift has been determined, the optimal excitation is searched for. The excitation is chosen in a codebook containing words with very few pulses arranged in a deterministic structure, which words are all obtained from a limited number of key words. The deterministic codebook structure allows a fast search for the optimal excitation, without need of storing the codebook and actually performing the synthesis filterings of the candidate excitations. <IMAGE>
IPC 1-7
IPC 8 full level
G10L 19/10 (2013.01); G10L 19/12 (2013.01)
CPC (source: EP)
G10L 19/10 (2013.01); G10L 19/12 (2013.01); G10L 25/24 (2013.01); G10L 2019/0003 (2013.01); G10L 2019/0011 (2013.01); G10L 2019/0012 (2013.01); G10L 2019/0014 (2013.01)
Citation (search report)
- [AP] US 5293449 A 19940308 - TZENG FORREST F [US]
- [A] US 4890328 A 19891226 - PREZAS DIMITRIOS P [US], et al
- [A] EP 0195487 A1 19860924 - KONINKL PHILIPS ELECTRONICS NV [NL]
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI NL SE
DOCDB simple family (publication)
EP 0619574 A1 19941012; CA 2120902 A1 19941010; FI 941648 A0 19940408; FI 941648 A 19941010; IT 1264766 B1 19961004; IT TO930244 A0 19930409; IT TO930244 A1 19941009; JP H075899 A 19950110
DOCDB simple family (application)
EP 94105438 A 19940407; CA 2120902 A 19940408; FI 941648 A 19940408; IT TO930244 A 19930409; JP 9552594 A 19940408