TV bandwidth reduction system using a hybrid discrete cosine DPCM
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United States of America Patent
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-
Apr 1, 1980
Grant Date -
N/A
app pub date -
May 15, 1978
filing date -
May 15, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An image-compression system, wherein the image consists of a planar array of data points having various brightness levels, comprises a transmitter and a receiver. The transmitter comprises an analog-digital converter, for converting input analog data into digital data. The cosine transform is taken of the incoming digital data to transform the data representing various brightness levels into the frequency domain. The various frequency data points are differentially pulse code modulated, thereby removing line-to-line redundancy, the output data being in parallel form. Timing circuitry is provided for controlling the timing of the various circuits. Circuitry is provided in a receiver for the modulating or decoding of the output signal of the transmitter.
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