G - Physics – 08 – B
Patent
G - Physics
08
B
354/237, 354/97,
G08B 13/24 (2006.01)
Patent
CA 1252848
ABSTRACT OF THE DISCLOSURE 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.
494873
Eccleston Larry
Goodrich Earl R. II
Swasdee Manot
Borden Ladner Gervais Llp
Progressive Dynamics Inc.
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