System for the transmission of speech signals

Details System for the transmission of speech signals System for the transmission of speech signals

1976-03-05

1977-07-05

Claffy, Kathleen H.

179 1SA, G10L 100, H04B 166

Patent

active

040341607

ABSTRACT:
A speech bandwidth compression system uses a first set of filters to separate the speech signal into baseband (300-800 hz) and highband (800-3200 hz) signals. The baseband (first formant or fundamental pitch frequency) is transmitted directly, and is also rectified to form harmonics which are mixed with the highband signals in a second set of (paired digital) filters which form sine and cosine forms (amplitude and phase information) of the harmonic components, which are then multiplexed for transmission to a receiver which provides the corresponding bandwidth expansion system to reconstruct the original speech signal.

REFERENCES:
patent: 3071652 (1963-01-01), Schroeder
patent: 3330910 (1967-07-01), Flanagan
patent: 3344349 (1967-09-01), Schroeder
patent: 3952164 (1976-04-01), David

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