Patent
1994-12-05
1997-02-11
MacDonald, Allen R.
395 212, 395 213, 395 228, G10L 302, G10L 900
Patent
active
056029594
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.
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Bergstrom Chad S.
Fette Bruce A.
Jaskie Cynthia A.
Wood Clifford
You Sean S.
Chowdhury Indranil
MacDonald Allen R.
McGurk IV Harold C.
Motorola Inc.
Whitney Sherry J.
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