Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-08-28
1998-08-04
Bacares, Rafael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
330 59, 330308, 250214A, H04B 1006
Patent
active
057902950
ABSTRACT:
A method and apparatus for receiving infrared signals are provided. The circuit includes preamplifier that includes an integrator that charges based on light detected by a photodiode. The circuit includes a warning circuit that generates a warning flag when the charge on the integrator exceeds a predetermined level. To prevent the integrator from saturation, digital logic resets the preamplifier by dumping the charge on the integrator in response to the warning signal. The digital logic is also configured to reset the integrator at predetermined intervals. When the incoming signal is encoded using pulse position modulation, the interval at which the integrator is reset is the length of a single time slot in the pulse position modulation frame. A sample and hold circuit is provided to hold a previous output of the preamplifier. The difference between the previous output of the preamplifier and the current output of the preamplifier is compared with a threshold voltage to detect pulses on the incoming signal.
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Apple Computer Inc.
Bacares Rafael
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