Non-video path data collection device

Details Non-video path data collection device Non-video path data collection device

1995-10-11

1999-03-09

Grant, Chris

Telecommunications

Audience survey or program distribution use accounting

348 1, H04N 716

Patent

active

058813608

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.

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