Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-12-19
1986-09-23
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358123, 307358, H04N 7167, H03K 5153
Patent
active
046139001
ABSTRACT:
A digital code reader reads the digital key code in a scrambled video signal. The key code represents the scheme used to scramble the signal before broadcasting and is used by the video receiver to unscramble the received signal. To prevent misreading of the key code due to interference such as ghost signals, the reader uses a predetermined property established for the broadcast signal. The change in that property caused by interference in the received signal is determined and a control signal is generated from that determination. A threshold signal is used to reproduce the key code from the received signal by comparison of the levels of the received signal with the level of the threshold signal. The level of the threshold signal is set by the control signal, which depends on the change detected in the predetermined property of the broadcast signal. Thus the level of the threshold signal can be set to enable the reproduced digital information to match the broadcast digital information.
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Kobayashi Hiroyuki
Matsunaga Osamu
Buczinski S. C.
Eslinger Lewis H.
Koltak Melissa
Sinderbrand Alvin
Sony Corporation
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