Inventors:
Hans S. Witsenhausen - Millburn NJ
Aaron D. Wyner - Maplewood NJ
Assignee:
Bell Telephone Laboratories, Incorporated - Murray Hill NJ
International Classification:
H04N 521
H04N 712
H04N 704
H04L 110
Abstract:
Error-correcting code theory is utilized in a video signal interframe coding system which requires no transmitter frame memory. In the transmitter, each of a plurality of n-bit words representing respective portions of the current frame is transformed into the corresponding k-bit syndrome of a selected (n,k) error-correcting code. As the syndrome of each word is received at the receiver, the corresponding word from the previous frame is read out of a receiver frame memory and its syndrome is formed. The received and formed syndromes are subtracted from one another and passed through an error-correcting code decoder. The previous-frame word is added to the decoder output, yielding the current-frame n-bit word.
