초록 ▼

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 selec

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.

대표청구항 ▼

A decoder for decoding received error-correcting code syndrome signals, said syndromes being derived from respective blocks of picture signals of a first frame of a video signal, said decoder characterized by means for storing blocks of picture signals representing the frame of said video signal pri

A decoder for decoding received error-correcting code syndrome signals, said syndromes being derived from respective blocks of picture signals of a first frame of a video signal, said decoder characterized by means for storing blocks of picture signals representing the frame of said video signal prior to said first frame, means including said storing means for forming the bit-by-bit exclusive-OR function of each received syndrome signal with a signal representing the syndrome of a corresponding block from the frame prior to said first frame to form a combined syndrome signal, an error correcting code decoder for decoding said combined syndrome signal to form a difference word signal, and means including said storing means for forming the bit-by-bit exclusive-OR function of a signal representing said previous-frame block with said difference word signal, whereby a signal representing each of said first-frame blocks is recovered.