A signal processing device whose operating parameters change as a reaction to the program content. For example, a compressor or expander. See Static Signal Processing Device.
"Thank you Chris! I gave CVC Productions the impossible task of restoring and transfering three 78 records, made in l939, of my parents at a New Year's Eve party. They were almost unplayable and one of the records was warped very badly. CVC was able to retrieve the sound to an understandable level on the warped record and the other two records ..."