VIDEO MIXERS

Brand Owner (click to sort) Address Description
FOCUS MX-4 FOCUS ENHANCEMENTS, INC. 1370 Dell Avenue Campbell CA 95008 video mixers, processors, and switchers;FOCUS MX-FOUR;
SYNONYM THOMSON VIDEO EQUIPMENT 17 RUE DU PETIT ALBI CERGY SAINT-CHRISTOPHE France video mixers;
 

Where the owner name is not linked, that owner no longer owns the brand

    
Technical Examples
  1. A DCR RF front-end removes the DC term resulting from mixer port to port leakage and feeds RF and LO signals into the mixers with different phase combinations. The signal inputs to the mixers result in the intermediate frequency (IF) output of mixers being 180 degrees out of phase and their DC terms in phase. When subtracting the two outputs from each other the IF signals add up while the DC terms cancel giving a DC free output. A DC offset feedback tuning loop detects the DC offset in the IF domain and then feeds back the tuning voltage to current injection mixers. A multiplier cancels the IF signals and amplifies the DC offset and a comparator compares the amplified DC offset with a threshold voltage and controls the gain of current injection mixers. The feedback tuning loop thus tracks time-varying DC offsets in real-time.