Media Noise Reduction in Disk Memory Devices
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Noise observed in the readout signal when recovering data from disk memory devices can originate from the media as well as from detection electronics. Media noise may be observed even on erased media. On the best phase-change optical disks, media noise is the dominant noise source, while on many magneto-optic disks, media noise is a significant part of the total noise. The data rate for disk memory devices is primarily determined by the disk noise in conjunction with the recorded signal strength, the sophistication of the data recovery electronics and the requirements of acceptable error rate. A method for reducing the effect of media noise in disk memory devices, particularly optical disk memory devices, is proposed. Such noise is often time-invariant, i.e.