DocumentCode :
2552185
Title :
A novel algorithm for low bit rate speech compression using a hybrid LP-harmonics model
Author :
Abu-Shikhah, Nazih ; Deriche, Mohamed
Author_Institution :
Sch. of Electr. & Electron. Syst. Eng., Queensland Univ. of Technol., Brisbane, Qld., Australia
fYear :
2000
fDate :
2000
Firstpage :
41
Lastpage :
43
Abstract :
We present a new LP-harmonic speech codec. At the coder speech signal is pre-processed, and an LP analysis is performed, together with pitch estimation and voicing decision. At the decoder and when the frame is voiced, the encoded parameters are used to estimate the spectrum envelope, extract and classify the harmonics as either strong or weak depending on their relative distance from multiples of the fundamental frequency. Strong harmonics parameters are then used to generate pure sinusoids. While weak harmonics are used to generate a mixed signal of a pure sinusoid and a random-like signal. For unvoiced frames, the excitation of the LP filter is generated as a white noise signal. The proposed model allows for the mixing of strong and weak periodic signals together with random signals to produce an excitation input that results in natural speech. Informal testing of the coder working at 1.82 kb/s showed that the output speech has high intelligibility, with quality comparable to that of a 4 kb/s sinusoidal codec
Keywords :
data compression; filtering theory; harmonic analysis; linear predictive coding; parameter estimation; spectral analysis; speech codecs; speech coding; speech intelligibility; white noise; 1.82 kbit/s; 4 kbit/s; LP analysis; LP filter excitation; LP-harmonic speech codec; decoder; encoded parameters; fundamental frequency; harmonics classification; harmonics extraction; hybrid LP-harmonics model; informal testing; low bit rate speech compression; mixed signal; natural speech; output speech intelligibility; periodic signals mixing; pitch estimation; pure sinusoids; random signals; sinusoidal codec; spectrum envelope estimation; speech signal; unvoiced frames; voicing decision; white noise signal; Bit rate; Decoding; Frequency estimation; Performance analysis; Power harmonic filters; Signal analysis; Signal generators; Speech analysis; Speech codecs; White noise;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Speech Coding, 2000. Proceedings. 2000 IEEE Workshop on
Conference_Location :
Delavan, WI
Print_ISBN :
0-7803-6416-3
Type :
conf
DOI :
10.1109/SCFT.2000.878388
Filename :
878388
Link To Document :
بازگشت