Method and apparatus for synthesizing speech without voicing...

Details Method and apparatus for synthesizing speech without voicing... Method and apparatus for synthesizing speech without voicing...

G - Physics

10

L

354/47

G10L 19/02 (2006.01)

Patent

CA 1324833

ABSTRACT OF THE DISCLOSURE A channel bank speech synthesizer for reconstructing speech from externally-generated acoustic feature inforamtion without using externally-generated voicing or pitch information is disclosed. An N-channel pitch-excited channel bank synthesizer (340) is provided having a first low-frequency group of channel gain values (1 to M) and a second high-frequency group of channel gain values (M+1 to N). The first group control a first group of amplitude modualtors (950) excited by a periodic pitch pulse source (920), and the second group controls amplitude modulators excited by a noise source (930). Both groups of modulated excitation signals are applied to the bandpass filters (960) to reconstruct the speech channels, and then combined at the summation network (970) to form a reconstructed synthesized speech signal. Additionally, the pitch pulse source (920) varies the pitch pulse period such that the pitch pulse rate decreases over the length of the word.

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