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A maximum-likelihood detector for a class IV partial response magnetic recording system
The use of a maximum-likelihood detector for a class IV partial response magnetic recording system is discussed. In the case of additive white Gaussian noise this detector has a 3 dB better performance than the conventional threshold detector. An implementation of the Viterbi algorithm has been made in TTL logic. A 7-bit analog-to-digital converter is used to digitize the ternary partial response waveform. The detector can be used for bit rates up to 60 Mbits. The performance has been measured on a 20 Mbits experimental digital-video magnetic recording system. In two experiments, reductions of the bit error rate by a factor of 2.9 and 9.3 were achieved, compared with a conventional threshold detector.