Speech coder and decoder for adaptive delta modulation coding sy

Details Speech coder and decoder for adaptive delta modulation coding sy Speech coder and decoder for adaptive delta modulation coding sy

1991-02-22

1993-07-20

Knepper, David D.

Pulse or digital communications

Repeaters

Testing

375 27, 381 31, G10L 900

Patent

active

052300609

ABSTRACT:
Deterioration of speech quality due to coding errors during transmission is reduced by suppressing high changes in amplitude. High changes in amplitude are detected by comparing an amplified step size with a decoded output signal. Step size is amplified (by a range of 2-4) and compared to a delayed, decoded output signal. The delayed, decoded output is attenuated (by a range of 0.8-0.99) and the comparison controls a selection between two signals: the amplified step size and the attenuated output. The attenuated output is selected if the delayed output is greater than the amplified step size; otherwise, the amplified step size is selected. The selected signal serves as a prediction signal.

REFERENCES:
patent: 4592070 (1986-05-01), Chow et al.
patent: 4630300 (1986-12-01), Kang et al.
patent: 4751736 (1988-06-01), Gupta et al.
Rabiner et al, Digital Processing of Speech Signals, 1978 by Bell Lab, Inc, pp. 207-209 and 228-232.
Bellanger, Digital Processing of Signals, 1984, by John Wiley & Sons, Ltd., pp. 354-357.

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