Non-video path data collection device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 9, 1999
Grant Date -
N/A
app pub date -
Oct 11, 1995
filing date -
Oct 11, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
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