Dropout detecting apparatus

Details Dropout detecting apparatus Dropout detecting apparatus

1989-05-23

1991-09-24

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307520, 307529, 358314, 358336, 360 381, H03K 500, H03K 5153

Patent

active

050516140

ABSTRACT:
A dropout detecting apparatus comprises a phase conversion circuit for converting an input signal into two signals which are different in phase by .pi./2 from each other, two squaring circuits for obtaining squares of the two signals respectively, an addition circuit for adding the two square signals, and an amplitude comparator for comparing the amplitude of an output signal of the addition circuit with a reference value. The output signal of the addition circuit becomes the square of the envelope of the input signal regardless of the phase of the input signal.

REFERENCES:
patent: 3328755 (1967-06-01), Buell et al.
patent: 4088960 (1978-05-01), Osborne
patent: 4585961 (1986-04-01), Daubert
patent: 4634988 (1987-01-01), Romeo, Jr.
patent: 4705969 (1987-11-01), Gross
patent: 4757390 (1988-07-01), Mehrgardt et al.
Digital Signal Processing in Video Tape Recorders; IEEE Transactions on Consumer Electronics, vol. CE-31, No. 3, Aug. 1985; Sonke Mehrgardt; pp. 374-377.

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