Methods and apparatus for identifying the source of a user selected signal via an intermediate frequency probe
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United States of America Patent
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Feb 18, 2003
Grant Date -
N/A
app pub date -
Aug 2, 1999
filing date -
Aug 2, 1999
priority date (Note) -
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Abstract
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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