Azimuth magnetic recording and reproducing apparatus and method employing waveform equalization

摘要

The present invention relates to an apparatus for azimuth-recording data on a magnetic recording medium. Heads (13a) and (13b) having azimuth angles different from each other are used and data are recorded on and reproduced from a plurality of adjacent tilted recording tracks on a magnetic tape T. A recording-system encoder (23) converts data to a code sequence in which null points of frequency spectrums are respectively provided at null points of waveform equalization characteristics of partial responses such as PR1, PR4, etc. For example, record-coding using a 8/10MSN code is performed. A reproduction-system equalizing circuit (28) performs waveform equalization based on the partial responses. Further, a data detector (29) detects the data by a Viterbi coding method for executing state transition during which the characteristic of the code sequence is adopted. Azimuth-recording in a narrow track width can be easily achieved while a reduction in effective recording speed due to an increase in the azimuth angle is being controlled.