Transmit control system using in-band tone signalling

Details Transmit control system using in-band tone signalling Transmit control system using in-band tone signalling

1996-04-12

1999-04-20

Vo, Nguyen

Telecommunications

Transmitter and receiver at separate stations

455515, 379386, H04Q 700

Patent

active

058965602

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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