The gain of the Y, C and CV signals is 6dB with 1 V pp input levels. A dual load would be two of these in parallel which would present a total of 75 ohm to the part. A single video load consists of a series 75 ohm impedance matching resistor connected to a terminated 75 ohm line, this presents a total of 150 ohm of loading to the part. All outputs are capable of driving 2 V pp, AC or DC-coupled, into either a single or dual video load. The clamp pulse is derived from the Y channel. The Y and C channels use separate feedback clamps. Both channels have DC-restore circuitry to clamp the DC-input levels during video sync.

The group delay circuit predistorts the signal to compensate for the inherent receiver IF filter’s group delay distortion.In a typical application, the Y and C input signals from DACs are AC-coupled into the filters. The audio trap removes video information in the spectral location of the subsequent RF audio carrier. The device also contains a summing circuit to generate filtered composite video, an audio trap and group delay compensation circuit. The FMS6406 is a dual Y/C 5th-order Butterworth lowpass video filter optimized for minimum overshoot and flat group delay.

Sound trap sound control systems