Two-way catv system with aml commands

Details Two-way catv system with aml commands Two-way catv system with aml commands

H - Electricity

04

N

350/24

H04N 7/173 (2006.01) G08C 15/00 (2006.01) H04N 7/16 (2006.01)

Patent

CA 1209687

ABSTRACT OF THE DISCLOSURE In a two-way cable television (CATV) system, multiple subscriber address codes are provided during designated vertical blanking interval (VBI) lines of the video signal transmitted from the CATV headend to a plurality of system subscriber terminals. Each subscriber terminal is provided with a decoder in which is stored subscriber unique address code for comparison with the received subscriber address codes. If there is an address match, an address match latch (AML) signal is generated for each VBI line address match. The address match signals thus generated from a multibit pulse coded downstream command signal for initiating various functions in the CATV system, e.g., acknowledging subscriber upstream requests, subscriber interrogation, power adjustment, etc.

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