Adaptive equalizing circuit and regenerative device using it, and adaptive equalizing method

Abstract

The present invention relates to an adaptive type equalization circuit and a playback apparatus employing the same that are suitable, for example, for being used for the playback of a digital signal. In the present invention, a playback signal is supplied to an analog to digital converter 6 and phase lock loop means 7 such that digital conversion of the playback signal is performed. Characteristic information such as a detection signal from an envelope detector 8 to which the playback signal is supplied, a signal showing a phase lock from the phase lock loop means 7 or the like is supplied to a data generation circuit 10 together with a playback signal from the analog to digital converter 6. The playback signal processed in the data generation circuit 10 and its characteristic information are supplied to a processor 11 such that operation for weighting coefficients is performed. The processor 11 is controlled by a controller 12 and selecting of adaptive equalization programs employed in the operation and control for an internal step size and the like are performed at high accuracy. The weighting coefficients operated or calculated in the processor 11 are supplied to a transversal filter 13 so that adaptive equalization processing for the playback signal is performed. Thus, an adaptive type equalization circuit can be employed in a playback apparatus in which there is no tracking control.

Dependencies are inferred from the claim text.