Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2005-01-04
2005-01-04
Trost, William (Department: 2683)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S039000, C455S067150, C455S067700, C455S134000, C455S135000, C340S679000, C033S503000, C033S558000
Reexamination Certificate
active
06839563
ABSTRACT:
An optical pulse signal from a machine tool measuring probe is received by a photodiode (28). To reduce interference from xenon strobe beacons, fluorescent lights etc., the pulse signal is processed by an AGC amplifier (30) with low frequency signal cancellation, and the pulses are then detected by a threshold detector (32). The threshold of this detector (32) is variable by a circuit (50), in accordance with the overall amplitude of the signal pulses, in order to provide the best rejection of interference pulses.
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Ibrahim, M. M., et al., “Performance Analysis of Optical Receivers with Space Diversity Reception,” IEE Proc. Commun., vol. 143, No. 6, December 1996, pp. 369-372.
Fuge Jonathan P
Kirby Steve
Le Danh
Oliff & Berridg,e PLC
Renishaw PLC
Trost William
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