Low bit-rate pattern coding with recursive orthogonal decision o

Details Low bit-rate pattern coding with recursive orthogonal decision o Low bit-rate pattern coding with recursive orthogonal decision o

1985-04-16

1988-02-09

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

381 31, H04B 166, G10L 302

Patent

active

047245352

ABSTRACT:
Instead of an excitation pulse sequence producing circuit which is used according to prior art in calculating locations of excitation pulses and pulse amplitudes thereof, an excitation pulse sequence parameter producing circuit is used in a low bit-rate pattern coding device in recursively giving delays of the respective pulse locations to a discrete impulse response sequence to provide a system of delayed impulse responses and in transforming the delayed impulse response system into an orthogonal set of set elements. Meanwhile, the pulse locations are determined with element amplitudes or factors calculated for the respective system elements by the use of the system elements and each segment of a discrete pattern signal sequence. The pulse locations and the element amplitudes are used as parameters descriptive of the excitation pulses. Alternatively, the pulse locations are determined one at a time after quantization of each of the recursively determined element amplitudes. Preferably, the discrete impulse response sequence and the segment are weighted in consideration of auditory or like sensual effects. In a counterpart decoder, the pulse amplitudes are calculated by the use of the pulse locations and the system elements which are calculated by using the pulse locations and another parameter sequence which, in turn, is derived in the coding device from the segment in the manner in the art of multi-pulse excitation.

REFERENCES:
B. S. Atal et al, "A New Model of LPC Excitation for Producing Natural-Sounding Speech at Low Bit Rates", Proceedings of IASSP, 1982, pp. 614-617.
John Makhoul, "Linear Prediction: A Tutorial Review", Proceedings of the IEEE, vol. 63, No. 4, Apr. 1975, pp. 561-580.
Joel Max, "Quantizing for Minimum Distortion", IRE Transactions on Information Theory, Mar. 1960, pp. 7-12.

Affiliated with

Also associated with

Rating

Low bit-rate pattern coding with recursive orthogonal decision o does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low bit-rate pattern coding with recursive orthogonal decision o, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low bit-rate pattern coding with recursive orthogonal decision o will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1286742