Telecommunications – Audience survey or program distribution use accounting
Patent
1999-01-27
2000-07-04
Grant, Chris
Telecommunications
Audience survey or program distribution use accounting
348 1, H04N 716
Patent
active
060850663
ABSTRACT:
A system performs audio matching to determine the channel to which a television set is tuned. In one embodiment, the system feeds two audio signals to primary and secondary windings of an audio transformer, and employs an output signal taken from a center tap on the primary winding to determine whether the audio signals match. In another embodiment, the system detects transitions of the two audio signals, produces a pulse for each transition, and compares the pulses to determine whether the signals match.
REFERENCES:
patent: 3803349 (1974-04-01), Watanabe
patent: 3919479 (1975-11-01), Moon et al.
patent: 4718406 (1988-01-01), Weinblatt
patent: 5023929 (1991-06-01), Call
patent: 5594934 (1997-01-01), Lu et al.
ADcom Information Services Inc.
Grant Chris
LandOfFree
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