Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-10-17
1987-10-13
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
375 27, H04N 7137, H04B 1406
Patent
active
047002263
ABSTRACT:
A predictive coding signal communication arrangement includes, at the transmitter, a subtractor for subtracting delayed predicted signals from current input signals to produce difference signals. Predicted signals are generated by adding the difference signals to the delayed predicted signals, and delay of the predicted signals produces the delayed predicted signals. The difference signals are also applied to a coder for Huffman coding, run-length coding, or the like, and then to a rate buffer for reducing data rate variability. In order to prevent overflow of the rate buffer, a control signal is generated which represents the level to which the rate buffer is filled. The control signal is used to control the data rate reduction or decimation of the current input signals. The decimation of the current input signal produces a data rate disparity, which is corrected by a similar decimation of the delayed predicted signal, and an inverse interpolation or data rate increase of the current predicted signal. Anti-alias and ghost reduction filters are also controlled by the control signal. The ghost reduction filters are switched after a period of time.
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: 4591908 (1986-05-01), Hirano
patent: 4604720 (1986-08-01), Stikvoort
patent: 4607281 (1986-08-01), Starck
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.
Britton Howard W.
Limberg Allen L.
Meise William H.
RCA Corporation
Steckler Henry I.
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