Apparatus and method for varying the timing of a control signal
First Claim
1. Apparatus for triggering a periodic pulse at random times, comprising:
- a timer for generating a periodic pulse in a defined time cycle in response to a control signal; and
a signal generator for variably generating said control signal within said defined cycle, said signal generator comprising a light sensitive component for varying in time the generation of said control signal in proportion to light incident on said light sensitive component for a portion of said defined cycle.
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Accused Products
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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Citations
9 Claims
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1. Apparatus for triggering a periodic pulse at random times, comprising:
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a timer for generating a periodic pulse in a defined time cycle in response to a control signal; and a signal generator for variably generating said control signal within said defined cycle, said signal generator comprising a light sensitive component for varying in time the generation of said control signal in proportion to light incident on said light sensitive component for a portion of said defined cycle. - View Dependent Claims (2)
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3. Apparatus for transmitting an identification signal, comprising:
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a triggering device for periodically generating an enabling pulse signal at random times, so that the generation of said enabling pulse signal varies in time in proportion to light incident on said triggering device for a portion of each period; and a transmitter for transmitting an identification signal in response to receipt of said enabling pulse signal. - View Dependent Claims (4, 5, 6, 7)
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8. A method for triggering a periodic pulse at random times, comprising the steps of:
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generating an enabling pulse in a defined time cycle in response to a control signal; and generating said control signal, within said defined cycle, by providing a light sensitive component for varying in time the generation of said control signal in proportion to light incident on said light sensitive component for a portion of said defined cycle. - View Dependent Claims (9)
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Specification