Comfort noise Generator (CNG) is that sender sends a few frames in silent time and receiver generates comfortable background noise using those frames.

Under the background, on the basis of the study of brushless doubly-fed machine and wind power technology, control system for wind-driven brushless doubly-fed generator was studied in this paper.

A key mode which allows use of a wipe pattern generator to prevent some undesirable portions of the key cut signal from cutting holes in the background video.