Magnetic recording and reproducing apparatus, reproduction signal processing apparatus, and reproduction signal processing method

DETAILED DESCRIPTION According to the first aspect of the present invention, there is provided a reproduction signal processing apparatus comprising: a memory circuit storing a predetermined pattern for deciding equalizing characteristics of an automatic equalizer in response to variation of a reproduction signal; a pattern converting circuit for converting the predetermined pattern outputted from the memory circuit into an equalization target pattern becoming a target of an equalizing correction by the automatic equalizer; an equalization error calculating circuit for producing an equalization error on the basis of the equalization target pattern and an equalization signal outputted from the automatic equalizer; and the automatic equalizer for executing a partial response waveform process of the reproduction signal on the basis of the equalization error and for correcting predetermined equalizing characteristics of the automatic equalizer by tracing the variation of the reproduction signal.
The pattern converting circuit has a discriminator for discriminating the polarity of the equalization signal outputted from the automatic equalizer to output a discrimination code.
The pattern converting circuit converts the discrimination code from the discriminator and a predetermined pattern stored in the memory circuit into the equalization target pattern becoming a target of the equalizing correction by the automatic equalizer.
The pattern converting circuit further has: a preset pattern storage memory for storing a training pattern to initialize the equalizing characteristics of the automatic equalizer; a target partial response pattern switch for converting the training pattern into an equalization pattern corresponding to a waveform after completion of the partial response waveform process; a discriminator discriminating the polarity of the equalization signal outputted from the automatic equalizer and for outputting a discrimination code; a pattern switch for selecting an equalization pattern from the training pattern on the basis of the discrimination code when the automatic equalizer is initialized; and an equalization target value selector for selecting an equalization target value from the equalization pattern