Title :
Low rate sinusoidal coding of speech using an improved phase matching algorithm
Author :
Ahmadi, Sassan ; Spanias, Andreas S.
Author_Institution :
Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ, USA
Abstract :
A new phase model for low-bit rate sinusoidal coding of speech is presented. Short-time sinusoidal phases are approximated using a combination of linear prediction, spectral sampling, delay compensation, and phase correction techniques. The algorithm is different than phase compensation methods proposed for source-system LPC in that it has been tailored to sinusoidal representation of speech. Performance analysis on a large speech database indicates considerable improvement in temporal and spectral signal matching as well as improved subjective quality of the reconstructed speech. The extra parameters used for representation of the sine wave phases require a small number of bits. The method can be applied to enhance phase matching in low bit rate sinusoidal coders, where underlying sine wave amplitudes are extracted from an all-pole model
Keywords :
linear predictive coding; pattern matching; signal representation; signal sampling; spectral analysis; speech coding; speech intelligibility; speech processing; LPC analysis; all-pole model; delay compensation; large speech database; linear prediction; low rate sinusoidal coding; performance analysis; phase correction; phase matching algorithm; reconstructed speech; short-time sinusoidal phases; sine wave amplitudes; sine wave phases; sinusoidal representation; spectral sampling; spectral signal matching; speech coding; subjective quality; temporal signal matching; Databases; Delay; Frequency conversion; Linear predictive coding; Phase estimation; Power harmonic filters; Quantization; Sampling methods; Speech analysis; Speech coding;
Conference_Titel :
Speech Coding For Telecommunications Proceeding, 1997, 1997 IEEE Workshop on
Conference_Location :
Pocono Manor, PA
Print_ISBN :
0-7803-4073-6
DOI :
10.1109/SCFT.1997.623883
