Bernard, Rothwell & Brown
Method and apparatus for encoding transmitting and receiving image by pulse code modulation
 An image encoding/transmitting apparatus and method implemented by applying the vector quantization technology utilizing the differential pulse code modulation system in which an estimated error signal is compared with a threshold value to generate a change or movement detection signal and a differential signal, which are then quantized so as to be transmitted and received wherein the polarity of the differential signal is judged by a polarity judgment circuit, a polarity is assigned to the threshold value based on the judgment value by a polarity adding circuit, the differential signal is corrected depending on the threshold value with the polarity, and the corrected differential signal is quantized so as to be transmitted and received. 
Mitsubishi Denki Kabushiki Kaisha
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Kenichi Naofumi Okikazu Hiroaki
Asano Goda Tanno Kikuchi