Importance

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Abstract

To identify the channel being actually selected by a TV set having built therein a digital tuner, a meter, which forms a channel selecting status monitoring apparatus, is connected via a cable to a digital audio output terminal of the TV set that outputs a digital audio signal of the selected channel. A digital audio signal comparison part checks whether the contents of a payload of a data-burst generated from the digital audio signal output from the digital audio output terminal coincides with the contents of a payload of a data-burst generated from a digital audio signal from a reference tuner, taking into consideration delays of the both digital audio signals on the time base. A control part controls the channel selecting status of the reference tuner so that the output from the digital audio signal comparison part may remain coincidence-detected, and determines, as a selected channel, the channel being selected by the reference tuner when the output from the digital audio signal comparison part becomes coincidence-detected.

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First Claim