Realization of a programmable pseudorandom noise source

Results on the realization of a programmable signal source which can be used to simulate the noise present in visual communication equipment is presented. The source is capable of generating impulsive, burst, and continuous pseudorandom noise with three designated statistical characteristics: noise duration period distribution (NDPD), noise-free period distribution (NFPD), and amplitude probability distribution within a noise duration period (NAPD). The trial-manufactured pseudonoise simulator was able to generate, as requested, wideband signals which continuously included constant magnitude spectra over a commercial video frequency bandwidth. The simulator is currently being used to assess a pseudonoise source for subjective evaluation tests with a view to studying the TV picture degradation effects associated with amplitude and time probability distribution characteristics of burst or impulsive noise