DITHER NOISE SOURCE WITH NOTCHED FREQUENCY SPECTRUM

摘要

A dither signal source generates a dither signal which is spectrally shaped in a desired manner. One or more notches are located at desired frequencies while minimising the hardware required in a digital signal processor for generating the digital random noise for the dither signal source. The notched dither signal can be added to an analogue signal prior to digitisation to reduce quantisation distortion without adding noise to the frequency range of interest.