Method and apparatus for encoding transmitting and receiving image by pulse code modulation
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United States of America Patent
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Feb 28, 1989
Grant Date -
N/A
app pub date -
May 26, 1987
filing date -
May 26, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.
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