Apparatus and method for varying the timing of a control signal
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United States of America Patent
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May 21, 1991
Issued Date -
N/A
app pub date -
Feb 6, 1990
filing date -
Mar 17, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method for transmitting an identification signal include a triggering device for periodically generating an enabling pulse signal at random times, whereby the periodic generation of the enabling pulse signal varies in each period in proportion to light incident on the triggering device and a transmitter for transmitting an identification signal in response to the enabling pulse signal. It is preferred that the triggering device include a timer for generating the enabling pulse signal in a defined time cycle in response to a control signal and a signal generator for variably generating the control signal within the defined cycle, wherein the signal generator includes a light sensitive component for varying in time the generation of the control signal in proportion to light incident on the light sensitive component for a portion of said defined cycle.
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