Waveform processing system and method for recording digital information

摘要

A reproduction waveform signal l(having a frequency f) containing perpendicular and longitudinal components is reproduced from a recording medium which is magnetized in the vertical direction, thereby recording digital information. The signal is processed through a waveform processing circuit including an operational amplifier having an input side connected to a time constant-setting circuit comprising a capacitor and a resistor, thereby obtaining a processed waveform signal having a constant amplitude and a phase shifted by 2x(tan-12 pi fA) DEG . Bits of the digital information is detected from the processed waveform signal.