Predictive decoder

Details Predictive decoder Predictive decoder

1991-01-14

1992-08-04

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

358136, H04B 1406

Patent

active

051366150

ABSTRACT:
A predictive decoder includes a decoding section, an adder, an inverse quantizer, a processor, and a superposing section. The decoding section decodes a coded signal to obtain a predictive error signal. The adder adds the predictive error signal to a local decoded signal and outputs a sum signal. The inverse quantizer has a plurality of quantization characteristics. The inverse quantizer receives a control signal for designating one of the plurality of quantization characteristics and the sum signal, selects one of the plurality of quantization characteristics in accordance with the control signal, and performs inverse quantization of the sum signal by using the selected characteristic to obtain an inversely quantized signal. The processor converts the inversely quantized signal into the local decoded signal. The noise superposing section receives the control signal and superposes a noise signal on the inversely quantized signal only when the control signal designates a quantization characteristic having a coarse level higher than a predetermined coarse level. An output signal from the noise superposing means is used as an output signal from the decoder.

REFERENCES:
patent: 4430670 (1984-02-01), Netravali
patent: 4562468 (1985-12-01), Koga
patent: 4706260 (1987-11-01), Fedele et al.
patent: 4774496 (1988-09-01), Tomasevich
patent: 4843465 (1989-01-01), Yuasa et al.
patent: 4888640 (1989-12-01), Acampora et al.
Bernard Lippel, Marvin Kurland, "The Effect of Dither on Luminance Quantization of Pictures", IEEE Transactions on Communication Technology, vol. COM-19, No. 6, Dec. 1971, pp. 879-888.

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