Cryptography – Cryptanalysis
Patent
1985-12-20
1987-08-18
Buczinski, Stephen C.
Cryptography
Cryptanalysis
380 10, 380 15, 380 19, 375110, H04N 7167
Patent
active
046882464
ABSTRACT:
A CATV television system has the sync and color subcarrier reference information replaced in the horizontal blanking intervals with compressed digital audio data. The digital audio data is in the form of a modified duobinary signal having data sampling points selected to coincide with the zero crossings of a color reference subcarrier. A phase locked loop provides the master clock for the signal generator and the data sampler. A horizontal interval detector circuit recovers a 1.8 MHz CW signal of greater than one half line duration, followed by a white horizontal identification pulse of 4.7 microseconds width, that are supplied in place of the pre-equalizing, vertical sync and post equalizing pulses in the vertical interval. CODE 1TV60CATV
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Eilers Carl G.
Lee Ronald B.
Turner Rudolf
Buczinski Stephen C.
Koltak Melissa L.
Zenith Electronics Corporation
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