Pulsed width modulated remote signalling and location identifica

Details Pulsed width modulated remote signalling and location identifica Pulsed width modulated remote signalling and location identifica

1995-10-16

1999-07-20

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

340332, 34028609, 34082569, 34082536, 345 48, 345 84, 455 95, 455105, 370212, 375238, G08C 1922

Patent

active

059261110

ABSTRACT:
A system for summoning a service industry worker using pulsed width modulation for remote signalling having a number of signalling switches, each connected to a transmitter. When a switch is activated, the corresponding transmitter transmits an RF carrier modulated by a lower frequency tone, turning the tone on and off in a pattern determined by a unique code assigned to the switch. A central receiver filters the signal from the transmitter and converts the tone pattern to a binary output to a computer. The computer instructs a display unit to turn on a light corresponding to the switch by sending its number in a serial bit stream of all lights that should be on. The bit stream is interpreted by circuits in the display unit using a clock signal. Upon the clock signal, the bit is sent to the appropriate register, which is used to turn on the correct light.

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