Threshold voltage generator

Details Threshold voltage generator Threshold voltage generator

1981-01-26

1984-02-14

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 7A, 307358, G01S 900

Patent

active

044319932

ABSTRACT:
Threshold circuit for selecting video signals derived from small stationary and moving objects amidst an abundance of clutter in a harbor area. The threshold voltage generator (1) of this circuit is suitable for detecting the temporal average .DELTA.P of the positive peak value and the temporal average .DELTA.N of the negative peak value from the AC component of the applied video voltage (V.sub.DC +V.sub.AC) and for generating modified voltages (l+k)(V.sub.AC -.DELTA.P) and k(-V.sub.AC -.DELTA.N). The modified voltages together with the inverted video voltage are combined to form the threshold voltage V=V.sub.DC +.DELTA.P+k(.DELTA.P+.DELTA.N) being k times the average peak-peak value above the average peak value of the video voltage, where k is a constant.

REFERENCES:
patent: 3176293 (1965-03-01), Nolen et al.
patent: 3638183 (1972-01-01), Progler et al.
patent: 3832577 (1974-08-01), Harr
patent: 3991379 (1976-11-01), Chadwick et al.
patent: 4067013 (1978-01-01), Smith
patent: 4117538 (1978-09-01), Shrader et al.
patent: 4156202 (1979-05-01), Takahashi
patent: 4175256 (1979-11-01), Dolikian
patent: 4219812 (1980-08-01), Rittenbach

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