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

A reproduction signal processing apparatus for generating an equalization signal by equalizingly correcting variation of a reproduction Signal reproduced from recording information on an information recording medium by an automatic equalizer, comprising:

• a memory means for storing a write data pattern to decide equalizing characteristics of said automatic equalizer in response to variation of said reproduction signal;
• a pattern converting means for converting said write data pattern outputted from said memory means into an equalization target pattern as a target for equalization and correction by said automatic equalizer;
• an equalization error calculating means for producing an equalization error from said equalization target pattern and said equalization signal outputted from said automatic equalizer;
• and
• said automatic equalizer for executing a partial response waveform process of said reproduction signal on a basis of said equalization error and for Correcting predetermined equalizing characteristics of said automatic equalizer while tracing a variation of said reproduction signal;
• wherein said automatic equalizer is connected to an A/D converting means for converting said equalization signal outputted from said automatic equalizer into a digital signal, and said A/D converting means is further connected to a discriminator, said discriminator outputting a discrimination code digitalized with a polarity.

A reproduction signal processing apparatus for generating an equalization signal by equalizingly correcting variation of a reproduction signal reproduced from recording information on an information recording medium by an automatic equalizer, comprising:

• a memory means for Storing a write data pattern to decide equalizing characteristics of said automatic equalizer in response to variation of said reproduction signal;
• a pattern converting means for converting said write data pattern outputted from said memory means into an equalization target pattern as a target for equalization and correction by said automatic equalizer;
• an equalization error calculating means for producing an equalization error from said equalization target pattern and said equalization signal outputted from said automatic equalizer:
• and
• said automatic equalizer for executing a partial response waveform process of said reproduction Signal on a basis of said equalization error and for correcting predetermined equalizing characteristics of said automatic equalizer while tracing a variation of said reproduction signal;
• wherein an input signal level shifting section for receiving said reproduction signal is connected to said automatic equalizer, and a parameter calculating section for receiving said reproduction signal to supply a shift amount at a 0 level of said reproduction signal to said input signal level shifting section is connected to said pattern convening means, and wherein amplitudes of positive and negative polarities are measured from an isolated wave of said reproduction signal by said parameter calculating section, and said equalization target pattern is produced on a basis of said amplitudes.

A reproduction signal processing apparatus for generating an equalization signal by equalizingly correcting variation of a reproduction Signal reproduced from recording information on an information recording medium by an automatic equalizer, comprising:

• a memory means for storing a write data pattern to decide equalizing characteristics of said automatic equalizer in response to variation Of said reproduction signal;
• a pattern converting means for converting said write data pattern outputted from said memory means into an equalization target pattern as a target for equalization and correction by said automatic equalizer;
• an equalization error calculating means for producing an equalization error from said equalization target pattern and said equalization Signal outputted from said automatic equalizer;
• and
• said automatic equalizer for executing a partial response waveform process of said reproduction signal on a basis of said equalization error and for correcting predetermined equalizing characteristics of said automatic equalizer while tracing a variation of said reproduction signal;
• wherein an input signal level shifting section for receiving said reproduction signal is connected to said automatic equalizer, an equalization target pattern correcting section for supplying a shift amount at a 0 level of said reproduction signal is connected to said input signal level shifting section, and wherein said equalization target pattern is corrected on a basis of said equalization error by said equalization target pattern correcting section.

A magnetic recording and reproducing apparatus having a reproduction signal processing apparatus for generating an equalization signal by equalizingly correcting variation of a reproduction signal reproduced from recording information on an information recording medium by an automatic equalizer, comprising:

• an input circuit including a preamplifier to amplify said reproduction signal, an AGC (Automatic Gain Control) circuit, and a filter;
• a memory circuit storing a write data pattern for initialization of said automatic equalizer, for deciding equalizing characteristics of said automatic equalizer in response to variation of said reproduction signal;
• a discriminator discriminating a polarity of said equalization signal outputted from said automatic equalizer, for outputting a discrimination code;
• a pattern converting circuit for converting said write data pattern outputted from said memory circuit into an equalization target pattern serving as a target of equalization and correction by said automatic equalizer on a basis of said discrimination code outputted from said discriminator;
• an equalization error calculating circuit for producing an equalization error from said equalization target pattern and equalization signal outputted from said automatic equalizer;
• and
• said automatic equalizer being connected to an A/D converting means for converting said equalization signal outputted from said automatic equalizer into a digital signal, .said A/D converting means being further connected to a discriminator, and said discriminator outputting a discrimination code digitalized with a polarity, in which said input circuit, said memory circuit, said discriminator, said pattern converting circuit, said equalization error calculating circuit, and said automatic equalizer are incorporated in an integrated circuit.

A reproduction signal processing method for generating an equalization signal by equalizingly correcting variation of a reproduction signal reproduced from recording information on an information recording medium by an automatic equalizer, said method comprising the steps of:

• a) storing a write data pattern into a memory means to decide equalizing characteristics of said automatic equalizer in response to variation of said reproduction signal;
• b) converting said write data pattern outputted from said memory means into an equalization target pattern so as to be different from positive and negative polarities with use of a reference of a 0 level of said equalization target pattern;
• c) producing an equalization error using an equalization error calculating means from said equalization target pattern and said equalization signal outputted from said automatic equalizer;
• and
• d) executing a partial response waveform process of said reproduction signal on a basis of said equalization error and correcting predetermined equalizing characteristics of said automatic equalizer by tracing variation of said reproduction signal.

A reproduction signal processing method for generating an equalization signal by equalizingly correcting variation of a reproduction signal reproduced from recording information on an information recording medium by an automatic equalizer, said method comprising the steps of:

• a) storing a write data pattern into a memory means to decide equalizing characteristics of said automatic equalizer in response to variation Of said reproduction signal;
• b) converting said predetermined pattern outputted from said memory means into an equalization target pattern serving as a target of equalization and correction by pattern converting means:
• c) producing an equalization error using an equalization error calculating means from said equalization target pattern and said equalization signal outputted from said automatic equalizer;
• and
• d) executing a partial response waveform process of said reproduction signal on a basis of said equalization error and correcting predetermined equalizing characteristics of said automatic equalizer by tracing variation of said reproduction signal
• wherein said equalization target pattern is converted so as to be different from positive and negative polarities with use of a reference of a 0 level of said equalization target pattern.

A reproduction signal processing method for generating an equalization signal by equalizingly correcting variation of a reproduction signal reproduced from recording information on an information recording medium by an automatic equalizer, said method comprising the steps of:

• a) storing a write data pattern for initialization of said automatic equalizer into a memory means to decide equalizing characteristics of said automatic equalizer in response to variation of said reproduction signal;
• b) converting said write data pattern outputted from said memory means into an equalization target pattern serving as a target of equalization and correction by a pattern converting means;
• c) producing an equalization error by an equalization error calculating means from said equalization target pattern and said equalization signal outputted from said automatic equalizer;
• and
• d) executing a partial response waveform process of said reproduction signal on a basis of said equalization error and correcting predetermined equalizing characteristics of said automatic equalizer by tracing variation of said reproduction signal;
• wherein said automatic equalizer is connected to an A/D converting means which performs a step of converting said equalization signal outputted from said automatic equalizer into a digital signal, and said A/D converting means is further connected to a discriminator which performs a step of outputting a discrimination code digitalized with a polarity.

A reproduction signal processing apparatus for generating an equalization signal by equalizingly correcting variation of a reproduction signal reproduced from recording information on an information recording medium by an automatic equalizer, comprising:

• a memory means for storing a write data pattern for initialization of said automatic equalizer to decide equalizing characteristics of said automatic equalizer in response to variation of said reproduction signal;
• a pattern converting means for converting said write data pattern outputted from said memory means into an equalization target pattern as a target for equalization and correction by said automatic equalizer;
• an equalization error calculating means for producing an equalization error from said equalization target pattern and said equalization signal outputted from said automatic equalizer;
• and
• said automatic equalizer for executing a partial response waveform process of said reproduction signal on a basis of said equalization error and for correcting predetermined equalizing characteristics of said automatic equalizer while tracing variation of said reproduction signal, wherein said automatic equalizer is connected to an A/D converting means for convening said equalization signal outputted from said automatic equalizer into a digital signal, and said A/D converting means is further connected to a discriminator, said discriminator outputting a discrimination code digitalized with a polarity.