Transmit control system using in-band tone signalling
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United States of America Patent
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Apr 20, 1999
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N/A
app pub date -
Apr 12, 1996
filing date -
Apr 12, 1996
priority date (Note) -
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Abstract
A transmit control system using in-band tones for activating and deactivating one or more remote sites. The transmit control system detecting energy in two or more spectral regions to determine if the signal received is a harmonic signal or a signalling tone to prevent accidental deactivation of the transmitter system. In one application, a modified Goertzel algorithm is employed by a digital signal processor to provide tone detection and a two stage detection provides controlled switching in noisy environments.
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