Multichannel digital signal correlator or structurator

Details Multichannel digital signal correlator or structurator Multichannel digital signal correlator or structurator

1985-12-17

1989-02-28

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 1531

Patent

active

048092100

ABSTRACT:
A multichannel digital signal correlator or structurator receives pulses e.g. from a photo multiplier (1) and passes them through a standardizer into channels 1 to M. Each channel has a counter (5.sub.m, m=1 to M) and shift register (6.sub.m) together with a multiplier (7.sub.m) and accumulator (8.sub.m). Clock pulses are applied to each counter (9) and shift register (6.sub.m) from a clock (4) through frequency dividers (9.sub.m) each set to different values giving increasing sample times (T.sub.s) in successive channels. Each multiplier (7.sub.m) has one input to the first stage of its associated shift register (6.sub.m) and another input connected to the fourth stage of the shift register (6.sub.m). Thus the multipliers receive two inputs one delayed (by .tau.) with respect to the other input. Accumulators (10, 11) count the number of photomultiplier pulses and clock pulses respectively during an experimental run. The correlator thus correlates two signals with increasing sample times (T.sub.s) and increasing delays (.tau.) in successive channels. A correlation function is obtained from the collective contents of all accumulators (8.sub.m, 10, 11). The multipliers (7.sub.m) may be replaced by difference squarer circuits to form a structurator.

REFERENCES:
patent: 3842252 (1974-10-01), Jakeman et al.
patent: 4071903 (1978-01-01), Head et al.
patent: 4593378 (1986-06-01), McWhirter et al.
Computer Design, "Multichannel High Speed Correlator", vol. 16, No. 2, Feb. 1977, pp. 118.
O'Driscoll et al., "A Digital Correlator With Blinker Facility", J. Physics E: Sci. Instrum., vol. 13, 1980, pp. 192-199.
"Photon Correlation and Light Beating Spectroscopy", Eds. Cummins et al., Plenum Press, New York, 1974.
"Photon Statistics and Photon-Correlation Spectroscopy", Pike et al., Advances in Quantum Electronics, vol. 2, 1, 1974, Academic Press.
"Statistical Accuracy in the Photon Counting Structure Function of Fluctuating Light Fields", Oliver et al., Optical Acta, 1981, vol. 28, No. 10, pp. 1345-1358.

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