Experiments on Automatic Equalizer without Increased Noise for Digital Recording Systems

Abstract

A new equalization method based on both the nonlinear equalization technique, called Linear Canceller, and probablistic decoding technique is proposed for high rate recording systems. Error rate improvement of more than two orders can be achieved by applying this method to an experimental digital VTR. Moreover, a new automatic equalizing algorithm is proposed. This algorithm has an advantage in that the automatic equalizer is constructed easily with not only digital circuits, but also with analog circuits. An adaptive automatic equalizer with a variable part constructed with all digital circuits is implemented. It is confirmed that sufficient eye opening is achieved using this algorithm at an operation speed of 46 Mbps.