NI 5431 Composite Video Generator
Calculate Zero-Overshoot Lowpass Filter

This utility VI calculates the filter coefficients for an FIR filter without overshoot on the Step Response. The filter impulse response is defined as a raised cosine (1-Cos) to the power of Power coefficient.

This filter can be used for filtering of the video components if no-overshoot is a requirement. When sampling at 20 MHz, the requirements for the different chroma components can be approximately achieved using the following input values:

NTSC Q Component: Filter size = 25; Power coefficient =0.50

NTSC I or PAL U and V components: Filter size = 7; Power coefficient = 0.40

Note  This VI requires the LabVIEW Advanced Analysis library. If you do not have this library installed, open the diagram and delete the specified frame.