Reconstruction of quantized DPCM or PCM signals

Details Reconstruction of quantized DPCM or PCM signals Reconstruction of quantized DPCM or PCM signals

1982-03-12

1984-02-07

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

375 26, H04N 712

Patent

active

044306709

ABSTRACT:
DPCM or PCM samples which have been quantized at a transmitter are assigned a representative value associated with one of a plurality of mutually exclusive quantization levels, each having predefined upper and lower limits. The sample values are reconstructed at the receiver using (in addition to the representative value) information regarding the quantizer characteristics as well as information derived from spatially or temporally correlated samples. In DPCM systems, the same technique can also be used at the transmitter to improve prediction of the present sample by improving reconstruction of previously processed samples.

REFERENCES:
patent: 3824590 (1974-07-01), Limb
Jayant-Adaptive Post Filtering of ADPCM Speech-Bell Syst. Tech. J.-vol. 60-No. 5-May, Jun. 1981-pp. 707-717.
Gibson et al.-Sequentially Adaptive Prediction and Coding of Speech Signals, IEEE Trans. Comm., vol. COM.-22-No. 11-Nov. 1974-pp. 1789-1797.
Gibson-Sequential Filtering of Quantization Noise in Differential Encoding Systems-Proc. of IEEE-Inter. Conf. on Cybernetics & Society-Nov. 1976-pp. 685-689.

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