Discrimination circuit for isolating disturbance signals which a

Details Discrimination circuit for isolating disturbance signals which a Discrimination circuit for isolating disturbance signals which a

1975-07-18

1977-01-18

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

307235C, 307235J, 328151, 328167, H03K 902

Patent

active

040042391

ABSTRACT:
A discrimination circuit arrangement operable to discriminate between signals in the form of d.c. pedestals and superimposed thereon disturbance signals in the form of voltage variations, comprises high pass filter means to remove the d.c. pedestal, except adjacent the leading edge where a decaying impulse is produced by the filter means. A rectangular pulse is generated, triggered by the discontinuity of the pedestal and having an amplitude related to that of the pedestal; the pulse is passed through further high-pass filter means having the same time constant as the input signal filter means to produce a replica signal of the filtered input signal in the form of a decaying impulse, free of disturbance signals. The two decaying impulse signals are compared in comparison means, with a threshold signal, and disturbance signals exceeding the threshold signal produce an output signal.

REFERENCES:
patent: 3360651 (1967-12-01), Linderman
patent: 3779649 (1973-12-01), Bertoya et al.
patent: 3825765 (1974-07-01), Schober et al.
patent: 3859537 (1975-01-01), Wolf

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