Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Using portable test set
Patent
1995-11-09
1996-11-19
Chin, Wellington
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Using portable test set
379 1, 379 2, 379 22, 379 26, 379 27, 379 29, 324133, 324145, 324538, 324542, 324556, 324555, H04M 124, H04M 308, G01R 1914, H01H 3102
Patent
active
055770991
ABSTRACT:
An inductive amplifier for identifying and tracing wires includes a comb filter for nulling out 60 Hz. power line "hum", as well as harmonics of 60 Hz. The inductive amplifier includes a probe for sensing an input signal. The comb filter includes a time delay circuit for providing a delayed output signal that is delayed by 16.67 milliseconds, or one 60 Hz. cycle, compared to the input signal. The comb filter also includes an inverter circuit for providing an inverted output signal that is 180 degrees out of phase with the input signal. The comb filter further includes a summer for summing together the delayed output signal and the inverted output signal to null out harmonic components of 60 Hz. while passing other signals to the output of the comb filter. The nulling method may also use digital processing techniques rather than discrete circuit components.
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One page, two-sided brochure by Chesilvale Electronics Ltd. Corp. of Plant City, Florida, bearing 1991 copyright notice, and entitled "New Testing Technology, PTS Pair Tracing System, A Faster, One Handed Tracking Method".
One page, two-sided brochure by Chesilvale Electronics Ltd. Corp. of Plant City Florida, bearing Sep. 1991 printing date code, and entitled "PTS Pair Tracing System, Pocket-Size Pair Tracing".
Three-page technical specifications by Chesilvale Electronics Ltd. Corp. of Plant City, Florida, bearing 1991 copyright notice, and bearing designation "Section CE-82-100, Issue 1, Oct. 15, 1991, PTS--Pair Tracing System, Technical Practice".
Progressive Electronics, Inc. Catalog dated Jul. 1992.
EG&G Reticon Application Notes No. 107, entitled "Bucket Brigade Devices, Circa 1977", published by EG&G Reticon of Sunnyvale, California, and bearing a copyright notice with the year date 1978.
Motorola, Inc. publication entitled "DSP56156 Digital Signal Processor User's Manual", bearing copyright notice 1992.
Clark Brian D.
Clement Douglas S.
Chin Wellington
Progressive Electronics, Inc.
Shankar Vijay
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