Digital dissolver

Details Digital dissolver Digital dissolver

1975-04-02

1976-11-02

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178DIG6, H04N 538

Patent

active

039898890

ABSTRACT:
A digital dissolver dissolves between two different video signals in synchronism with a composite sync signal. Frame pulses are separated from the composite sync signal and are used to generate a high frequency signal in phase locked relation with the frame pulses. The high frequency signal is fed to a programmable frequency divider under the control of gating and control circuitry to provide an output pulse in response to each occurrence of a selected number of cycles of the high frequency signal, the selected number being a function of the selected dissolve rate programmed into the divider by thumbwheel switches or by signals from a remote location. The pulses are fed to a binary counter which feeds a digital to analog converter to generate a dissolve signal of generally ramp-like waveform. The dissolve signal and its complement are applied to a pair of multipliers to attenuate the two different video signals.

REFERENCES:
patent: 3598908 (1971-08-01), Poulett
patent: 3732365 (1973-05-01), Rando et al.
patent: 3758712 (1973-09-01), Hudson

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