Patent ID: 6175460
Filing Date: 2001-01-16
Classification: G11B

Abstract:
A magnetic recording and reproducing apparatus, comprising:a magnetic head arranged to read a signal from a magnetic recording medium;a signal processing circuit which converts the signal read from said magnetic head to user data, said signal processing circuit comprising an A/D converter which converts said signal read from said magnetic head to a digital signal, and a Viterbi detector which identifies said user data from said digital signal; anda coefficient setting unit which sets reference amplitude values for the Viterbi detector, including a first reference amplitude value that is larger than an expected input waveform amplitude value, and a second reference amplitude value that is smaller than the expected input waveform amplitude value, said first and second reference amplitude values being selected so that more data errors are expected at each of said first and second reference amplitude values than at said expected input waveform amplitude value.