Continuous and discontinuous sine wave synthesis of speech signa

Details Continuous and discontinuous sine wave synthesis of speech signa Continuous and discontinuous sine wave synthesis of speech signa

1995-08-16

1998-11-03

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Synthesis

704269, G10L 702, G10L 918

Patent

active

058324372

ABSTRACT:
A method for decoding encoded speech signals uses sine wave synthesis based on harmonics of the original speech signal. The harmonics are obtained by transforming the original speech signal from a time domain to a frequency domain, and the harmonics are arranged as sequential frames with the harmonics of a given frame having a pitch period that may or may not be the same as the pitch period of another frame. According to the decoding method, data arrays respectively containing amplitude data and phase data of the harmonics are zero-padded to provide the arrays with a pre-set number of elements. Inverse orthogonal tarnsformation of the data arrays produces time domain information used to generate a time domain waveform signal for restoring the encoded speech signals. The different pitch periods of the frames are normalized to each other either by smooth (continuous) or acute (discontinuous) interpolation depending on the degree of change in the pitch period between the frames.

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