Low frequency component restoration circuit for restoring and compensating for low frequency component lost in digital signal transmission system

摘要

A low frequency component restoration circuit of a digital VTR restores cut off low frequency component of a reproduced digital signal. The low frequency component restoration circuit comprises a first low frequency compensation path (2,5a,6,9,10) for performing quantized feed-back type low frequency compensation to an inputted digital signal and a second low frequency compensation path (11,5b) for performing integration type low frequency compensation to the inputted digital signal, and wherein an output of the first low frequency compensation path is selectively supplied when a normal reproduction mode is selected where its amplitude of the inputted digital signal wanders slightly, and an output of the second low frequency compensation path is selectively supplied when a special reproduction mode is selected where an amplitude of the inputted digital signal greatly wanders in a short time period.