(57) A point of purchase advertising system is provided which senses the presence of a
person in the vicinity of an advertising display and thereupon renders an appropriate
advertisement such as a recorded verbal message or a visual or aural demonstration.
In preferred forms, the overall apparatus includes an ultrasonic sensing circuit for
detecting the approach of a potential customer, an advertisement giving device, typically
an endless tape playback unit and a coupled speaker, and a controller for operation
of the playback unit in response to detection of a customer. A voice operated relay
circuit is advantageously coupled with the audio output of the playback unit and the
playback controller, so that operation of the playback unit is maintained until the
entire recorded advertisement has been given.
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