Method and apparatus for encoding speech excitation waveforms th

Details Method and apparatus for encoding speech excitation waveforms th Method and apparatus for encoding speech excitation waveforms th

1996-09-13

1998-08-11

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704219, G10L 900, G10L 302

Patent

active

057941866

ABSTRACT:
A vocoder device and corresponding method characterizes and reconstructs speech excitation. An excitation analysis portion performs a cyclic excitation transformation process on a target excitation segment by rotating a peak amplitude to a beginning buffer location. The excitation phase representation is dealiased using multiple dealiasing passes based on the phase slope variance. Both primary and secondary excitation components are characterized, where the secondary excitation is characterized based on a computation of the error between the characterized primary excitation and the original excitation. Alternatively, an excitation pulse compression filter is applied to the target, resulting in a symmetric target. The symmetric target is characterized by normalizing half the symmetric target. The synthesis portion performs reconstruction and synthesis of the characterized excitation based on the characterization method employed by the analysis portion.

REFERENCES:
patent: 5602959 (1997-02-01), Bergstrom et al.

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