H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/40, 350/56
H04N 7/12 (2006.01) H04N 7/087 (2006.01) H04N 7/093 (1990.01)
Patent
CA 1331401
ABSTRACT OF THE DISCLOSURE The analog implementation of a television signal transmission system includes a line integrator for developing a first analog signal corresponding to low frequency components, that is, the average level of active video below 15 KHz during each horizontal line of signal. An A/D converter produces a digital value corresponding to the first analog signal and a D/A converter develops a second analog signal corresponding to the digital value. The second analog signal is subtracted from the baseband video signal to develop the high frequency components of the video signal. The digital value is encoded in the horizontal blanking interval of the high frequency components which is modulated onto an RF carrier. A one horizontal line delay in the baseband video signal is introduced before subtraction. In the digital implementation, a digital average is taken of the active video below 15 KHz of each line and subtracted. In the receiver, the coded data is decoded to reconstruct the low frequency components signal, which is added to the high frequency. components video signal to reconstruct the television signal.
595635
Mitchell Richard J.
Zenith Electronics Corporation
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