Methods and apparatus to verify presentation of media content

摘要

Example methods and apparatus to verify presentation of media content are disclosed. A disclosed example apparatus for use with a set-top box (STB) and a media presentation device includes an audio input interface to receive a first audio signal associated with a program selected by a user via the STB, a microphone to receive a free-field radiating second audio signal output by at least one of the media presentation device or an audio system associated with the media presentation device, a comparator to compare the second audio signal to the first audio signal to form an output, and an output interface to provide a value indicative of whether the program selected by the user via the STB is presented at the media presentation device.

主权项

1. An apparatus for use with a set-top box (STB) and a media presentation device, comprising:
an audio input interface to receive a first audio signal associated with a program selected by a user via the STB; a microphone to receive a free-field radiating second audio signal output by at least one of the media presentation device or an audio system associated with the media presentation device; a finite impulse response filter having adaptive coefficients to delay and to attenuate the first audio signal to form an estimate of the second audio signal; a comparator to compare the second audio signal to the estimate of the second audio signal to form an output; a privacy protector to facilitate burst mode operation of the comparator by periodically disabling the microphone and the comparator; and an output interface to provide a value indicative of whether the program selected by the user via the STB is presented at the media presentation device based on the output.