Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1984-11-19
1987-05-26
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
340572, G08B 1324
Patent
active
046689427
ABSTRACT:
The specification discloses a digital/analog signal analyzer for an electromagnetic surveillance system. Included is a notch filter having a switched capacitor filter controlled by a phase lock loop for nulling a time-varying driving frequency from the received signal. The analyzer further includes structure for digitizing the received signal and for implementing a recursive filter to enhance digital feature extraction. The recursive filter in turn includes structure for delaying a read address for subsequent use as a write address to facilitate the rapid updating of data in memory. Also included is a digital-to-analog converter assembly having a pair of piggy-backed digital-to-analog converters to produce an analog signal dependent upon both a mantissa and an exponent of a digital number in scientific notation.
REFERENCES:
patent: 3908116 (1975-09-01), Bjornsen
patent: 4038536 (1977-07-01), Feintuch
patent: 4168496 (1979-09-01), Lichtblau
patent: 4171913 (1979-10-01), Wildy et al.
patent: 4321586 (1982-03-01), Cooper
patent: 4527152 (1985-07-01), Scarr et al.
patent: 4539558 (1985-09-01), Fearon
Eccleston Larry
Goodrich, II Earl R.
Swasdee Manot
Progressive Dynamics, Inc.
Rowland James L.
Tumm Brian R.
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