Rate buffer control of difference signal decimation and interpol

Details Rate buffer control of difference signal decimation and interpol Rate buffer control of difference signal decimation and interpol

1986-09-30

1987-09-01

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358135, 375 27, H04N 7137, H04N 712

Patent

active

046912339

ABSTRACT:
A predictive coding signal communication arrangement includes at the transmitter a subtractor for subtracting a delayed predicted signal from current signal to produce difference signals. To reduce the data throughput, the difference signals are data reduced or decimated to produce rate-reduced difference signals. The rate-reduced signals are applied to a coder for Huffman coding, run-length coding or the like, and then to a rate buffer for reducing data rate variability. The rate-reduced difference signals are also interpolated back to the original data rate and applied to an adder together with the delayed predicted signal to produce current predicted signal. The current predicted signal is at least delayed to produce the delayed predicted signal. In a particularly advantageous embodiment, the rate buffer is coupled to a fill control circuit which produces a control signal representing the rate buffer fullness. The control signal controls the decimator to adjust the decimation, and also controls the interpolator to maintain the data rate applied to the adder. Anti-alias and ghost reduction filters are also controlled by the control signal.

REFERENCES:
patent: 3769451 (1973-10-01), Connor
patent: 4460923 (1984-07-01), Hirano et al.
patent: 4488175 (1984-12-01), Netravali
patent: 4541012 (1985-09-01), Tescher
patent: 4551753 (1985-11-01), Nishizawa et al.
patent: 4562468 (1985-12-01), Koga
patent: 4568965 (1986-02-01), Powers
patent: 4569058 (1986-02-01), Grallert
patent: 4609941 (1986-09-01), Carr
Article entitled "Picture Coding: A Review" by Netravali et al., published at pp. 366-407 of the Proceedings of the IEEE, vol. 68, No. 3, Mar. 1980.

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