Differential encoder with self-adaptive predictive filter and a

Details Differential encoder with self-adaptive predictive filter and a Differential encoder with self-adaptive predictive filter and a

1989-03-14

1990-07-03

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 34, 341143, H04B 1406

Patent

active

049397494

ABSTRACT:
A differential encoder for speech encoding, typically in a 16 kHz wide band, has a self adaptive predictive filter, comprising a comparator receiving, on an additive input, successive samples of a signal to be encoded and, on a subtractive input, an estimated signal delivered by a prediction loop which receives the error signal from the output of the comparator, the prediction loop comprising a self-adaptive predictive filter, a gain control circuit and a multiplier which receives the outputs of the predictive filter and of the gain control circuit and whose output is connected to the subtractive input. The predictive filter comprises a plurality of parallel channels assigned to different mutually adjacent spectral bands, each channel comprising an input pass-band filter, a quadratic detector fed by the pass-band filter, and a peak detector whose input is connected to the quadratic detector and whose output is applied to a multiplier which also receives the output signal from the respective pass-band filter, the outputs of all multipliers driving a common summer. A decoder for recovering the speech has a symmetric construction.

REFERENCES:
patent: 4654863 (1987-03-01), Belfield et al.
patent: 4691233 (1987-09-01), Acampora
patent: 4797902 (1989-01-01), Nishiguchi et al.

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