Low-pass filter with remotely controllable rise time

Details Low-pass filter with remotely controllable rise time Low-pass filter with remotely controllable rise time

1978-08-30

1980-06-03

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358183, 333174, 328167, H04N 522, H03H 900, H03B 100

Patent

active

042064740

ABSTRACT:
A remotely controlled chroma key soft edger is described for use with an analog switcher. The keying signal is a low passed filtered and differentially summed with substantially an unfiltered keying signal and the resultant high frequency components are summed with the low pass filtered signal. The gain of the peaking signal is remotely controlled to adjust the summed rise time of the keying signal.

REFERENCES:
patent: 3560638 (1971-02-01), Skydstrup et al.
patent: 3970774 (1976-07-01), Bazin et al.

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