Patent ID: 6167011
Filing Date: 2000-12-26
Classification: G11B

Abstract:
A disc drive system including a disc containing a plurality of tracks, the disc drive system comprising:a first plurality of sensors generating output which is combined to form a first signal oscillating in response to movement across one or more of said plurality of tracks;a first low pass filter that receives said first signal and removes high frequency components, said first filter introducing a phase shift to said first signal;a second plurality of sensors generating output which is combined to form a second signal oscillating in response to movement across one or more of said plurality of tracks;a second low pass filter that receives said second signal and removes high frequency components, said second filter introducing said phase shift to said second signal,said first and second filters have approximately identical cut-off frequencies, anda gain circuit coupled to said second filter which inverts the filtered second signal and adjusts peak-to-peak amplitude.