Radio frequency proximity detection and identification system and method
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United States of America Patent
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-
Dec 2, 2008
Grant Date -
Feb 12, 2004
app pub date -
Jul 15, 2003
filing date -
Jul 26, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed herein is a critical band encoding technology (CBET) system having at least one portable people meter (PPM) and a home base station and/or household hub, the CBET system containing a radio frequency (RF) proximity detection and identification system, comprising at least one RF transmitter for receiving a control signal, modulating an RF signal to a present modulation frequency upon receipt of the control signal, and wireless transmitting the modulated signal; and an RF receiver for receiving the wirelessly transmitted modulated signal, determining the modulation frequency, and transmitting the modulation frequency to a remote location, wherein the transmission power of the RF transmitter is preset to transmit the modulated data within a predetermined range.
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