Combined data rate reduction system

Details Combined data rate reduction system Combined data rate reduction system

1981-10-30

1984-08-28

Murray, Richard

Facsimile and static presentation processing

Facsimile

Recording apparatus

358133, 358135, 358138, 358335, H04N 949

Patent

active

044687087

ABSTRACT:
A method and apparatus are disclosed for performing a reduction of the data rate of a data stream for transmission through a transmission channel or recording and for subsequently reconstructing the original data stream upon receipt or during reproducing. The method and apparatus utilizes a combination of two processes, one of which eliminates or drops digital samples from the data stream to reduce the data rate for transmission and which subsequently reconstructs the original data stream using the unaltered and recovered digital samples to generate an interpolated value for each of the samples that had been dropped. The second process utilizes differential pulse code modulation for reducing the number of data bits per sample before sending the data stream through the transmission channel and for subsequently restoring the data to its original multi-bit form.

REFERENCES:
patent: 4129882 (1978-12-01), Limb
patent: 4227204 (1980-10-01), Rossi
patent: 4301466 (1981-11-01), Lemoine et al.
patent: 4323916 (1982-04-01), Dischert et al.

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