Methods and apparatus for identifying the source of a user...

Details Methods and apparatus for identifying the source of a user... Methods and apparatus for identifying the source of a user...

H - Electricity

04

B

H04B 1/16 (2006.01) H04N 5/46 (2006.01) H04N 7/173 (2006.01) H04N 17/04 (2006.01) H04N 17/00 (2006.01) H04H 9/00 (2006.01)

Patent

CA 2290300

A non-invasive or minimally invasive intermediate frequency (I. F.) probe is disclosed for use as part of a broadcast audience measurement system. The probe can be used both to acquire a representation of a tuned signal and to inject a recognition signal into a tuned signal. The probe is configurable for use with both analog (e.g., NTSC, PAL or SECAM) and digital (e.g., ATSC) television broadcasts. Optionally, when in the injection mode, the I.F. probe can be used with another sensor to determine which of several inputs to a monitored receiver is providing the audio and/or video output(s) selected by an audience member.

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