Recording equalizer and magnetic recording/reproducing apparatus using the equalizer

A signal processing circuit comprising:

• a write current driver;
• means for storing a plurality of values of predetermined compensation parameter d,
• means for storing a bit sequence of write data;
• means for selecting one of said plurality of values of said parameter d, wherein;
• said means for storing a bit sequence of write data transfers the bit sequence to said write driver synchronized with a predetermined write clock;
• said means for selecting a value of said parameter d selects said compensation parameter d in accordance with a write object bit and its previous bit, and
• said write driver delays an inversion timing of said object bit by said parameter d from said write timing clock.

A signal processing circuit comprising:

• a write current driver;
• a data buffer for storing a bit sequence of write data, and
• a compensation parameter calculator, wherein
• said data buffer transfers said bit sequence to said write driver synchronized with a predetermined write clock;
• said compensation parameter calculator determines a compensation parameter d in accordance with a write object bit and its previous bit, and
• said write driver delays an inversion timing of said object bit by said parameter d from said write timing clock.