Signal transmission circuit for probe

Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers

Reexamination Certificate

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Details

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.

REFERENCES:
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patent: 5150529 (1992-09-01), Collingwood
patent: 5272817 (1993-12-01), Gonzalez
patent: 5279042 (1994-01-01), Gonzalez et al.
patent: 5949352 (1999-09-01), Ferarri
patent: 0 337 670 (1989-10-01), None
patent: 0 337 671 (1989-10-01), None
patent: 0 501 681 (1992-09-01), None
patent: 2 567 700 (1986-01-01), None
patent: WO 9528615 (1995-10-01), None
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.

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