Title :
Wideband speech coding using forward/backward adaptive prediction with mixed time/frequency domain excitation
Author :
Schnitzler, Jürgen ; Eggers, Joachim ; Erdmann, Christoph ; Vary, Peter
Author_Institution :
Inst. of Commun. Syst. & Data Process., Tech. Hochschule Aachen, Germany
Abstract :
This paper describes a wideband (7 kHz) speech coding scheme using code-excited linear prediction (CELP) with mixed time and frequency domain excitation. The proposed frequency domain innovation can be used alternatively or in parallel to a time domain codebook. In addition an improved synthesis filter is used consisting of a signal dependent combination of a forward adaptive and a backward adaptive (FA/BA) structure. An experimental codec operating at 15.5 or 20.0 kbit/s is demonstrated
Keywords :
linear predictive coding; speech codecs; speech coding; time-frequency analysis; 15.5 kbit/s; 20 kbit/s; 7 kHz; CELP; code-excited linear prediction; codec; forward/backward adaptive prediction; mixed time/frequency domain excitation; synthesis filter; time domain codebook; wideband speech coding; Adaptive filters; Bit rate; Discrete cosine transforms; Filtering; Frequency domain analysis; Quantization; Shape control; Speech coding; Technological innovation; Wideband;
Conference_Titel :
Speech Coding Proceedings, 1999 IEEE Workshop on
Conference_Location :
Porvoo
Print_ISBN :
0-7803-5651-9
DOI :
10.1109/SCFT.1999.781465
