Acoustic communication system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Mar 17, 2009
Grant Date -
N/A
app pub date -
Jul 31, 2000
filing date -
Jul 30, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A signalling system is provided which can be used to update the prices of goods which are electronically displayed on supermarket shelves (1). The signalling system comprises a first signalling device having an input terminal for receiving electrical message data received from a central computer system (5), a spread spectrum encoder for encoding the received message data and an electroacoustic converter (11) for converting the encoded data into corresponding acoustic signals and for transmitting the acoustic signals into a transmission medium. The signalling system also comprises a second signalling device (3) having means for receiving acoustic signals from said transmission medium and for converting the received acoustic signals into corresponding electrical signals, a spread spectrum decoder for decoding the received signals and a message regenerator for regenerating the message data transmitted by the first signalling device from the signals output by the decoder.
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