Decision feedback equalization of the dc null in high-density digital magnetic recording
- 1 July 1978
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
- Vol. 14 (4), 218-222
- https://doi.org/10.1109/tmag.1978.1059758
Abstract
The dc null in a digital magnetic recording channel is equalized in a novel way which allows recovery of direct recorded NRZ waveforms with no coding constraints. The technique involves decision feedback equalization which can be implemented with simpleRCfilters. Feedback power is determined by the choice ofRCand can be optimized independently of the fact of equalization. Measurements on a commercial helical-scan video transport indicate that the harmful effects of a dc null can be greatly reduced; specifically the error rate (excluding dropouts) on a 1023-bit 20-Mbit/sec pseudorandom pattern was reduced from 3 & 10-5to below 10-8.Keywords
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