Vocoder systems providing wave form analysis and synthesis using

Details Vocoder systems providing wave form analysis and synthesis using Vocoder systems providing wave form analysis and synthesis using

1976-05-24

1977-12-20

Claffy, Kathleen H.

G10L 100

Patent

active

040643638

ABSTRACT:
A voice-excited vocoder analyzer divides the audio input signals into a baseband and upper band by deriving Fourier transform coefficients and transmitting the coefficients in a time-multiplex frame. The coefficients (a.sub.n and b.sub.n) are derived in two paths, each path multiplying the input signal by a stepped-frequency local source, (one sine, one cosine), the product feeding a recirculating shift register. The vocoder synthesizer effectively performs the same operations in reverse.

REFERENCES:
patent: 3026375 (1962-03-01), Graham
patent: 3344349 (1967-09-01), Schroeder
patent: 3360610 (1967-12-01), Flanagan
patent: 3403227 (1968-09-01), Malm
patent: 3471648 (1969-10-01), Miller
J. Flanagan, "Speech Analysis and Perception", 2nd Ed., Springer-Verlag, 1972, pp. 395-397.
R. Freudberg et al., "An All-Digital Pitch Excited Vocoder etc.", Conference on Speech Comm. and Proc., 1967.

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