Mixing desk switching arrangement for video signals - has stepped resistances switching in signal paths from frequency or rhythm generator

摘要

A circuit (7) responds to a chanveover signal (U), a switching outputs (X,Y,Z) are coupled to the signal paths of the video mixing desk (1). By means of this cirucit, a variable electrical magnitude (R11,R12,R13,R14) is switched into the signal paths to produce a resultant video signal from the applied video signal in dependence on the switch-over signal. Pref. the magnitude (R11-R14) is altered in steps. A counter for the switch over pulses may vary the magnitude after the occurrence of a set number of the pulses. Pref. the magnitude is a resistance value. ADVANTAGE - Allows changeover from computer or sound input.