Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1990-02-21
1992-07-21
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 51, G10L 500
Patent
active
051330105
ABSTRACT:
A channel bank speech synthesizer for reconstructing speech from externally-generated acoustic feature information 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 (+1 to N). The first group controls a first group of amplitude modulators (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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Borth David E.
Gerson Ira A.
Lindsley Brett L.
Vilmur Richard J.
Hackbart Rolland R.
Jenski Raymond A.
Kemeny Emanuel S.
Motorola Inc.
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