Abstract: A digital filter having K coefficients h(k) processes code words x(n-k), represented in the binary codes, of an input signal bit-parallel and uses filter coefficients h(k) represented in the CSD code. Substituting in the filter equation ##EQU1## the representation of the coefficients in the CSD code and the representation of the input code words in the binary code, the problem of converting a linear combination of powers of two, having arbitrary integral coefficients, into a binary number will occur repeatedly. Carrying out this conversion by means of cascades of Wallace Trees terminated by adders for two binary numbers results in a digital filter that is suitable for sampling rates up to 20 MHz and that can also be realized without any difficulty when an excess of 25 coefficients is needed for adhering to the required filter characteristic.

Abstract: A predictive encoding arrangement for use in a video digital imaging system wherein sequences of codewords are produced by a video signal source corresponding to sequential elements of a video picture, codewords for any given picture element being successively produced in successive picture periods. Codewords for the N picture elements of each picture period are stored in a picture memory. An encoder encodes the difference between codewords supplied by the video signal source and codewords read out from the memory, the encoded codewords than being decoded by a decoder and supplied to the memory for storage therein. A cyclic address counter operating at the codeword rate cyclically generates N-K memory addresses for storage of codewords in the memory, wherein N>K and K is the number of codeword periods for the encoder and decoder to produce a decoded codeword in response to a codeword from the video signal source.