Data storage device comprising equalizer filter and inter-track interference filter
AssigneeWestern Digital Technologies, Inc.
InventorAlvin J. Wang
Life of this patent
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Abstract
A data storage device is disclosed comprising a head actuated over a disk. A read signal from the head is sampled to generate signal samples, and the signal samples are filtered with an equalizer filter to generate equalized samples. The equalized samples are filtered with an inter-track interference (ITI) filter to generate ITI attenuated samples, and a data sequence is detected based on the ITI attenuated samples. In one embodiment, the ITI filter comprises a transfer function: 1−HPF(ek) and in another embodiment the ITI filter comprises a transfer function: 1−LPF(ek) where ek represents a noise sequence in the equalized samples, HPF represents a high pass filter operating on ek, and LPF represents a low pass filter operating on ek.
Claims24
A data storage device comprising:
- a disk;
- a head actuated over the disk;
- and
- control circuitry configured to:
- sample a read signal from the head to generate signal samples;
- filter the signal samples with an equalizer filter to generate equalized samples;
- filter the equalized samples with an inter-track interference (ITI) filter to generate ITI attenuated samples;
- and
- detect a data sequence based on the ITI attenuated samples,
- wherein the ITI filter comprises a transfer function:
- 1−HPF(ek)
- where:
- ek represents a noise sequence in the equalized samples;
- and
- HPF represents a high pass filter operating on ek.
A data storage device comprising:
- a disk;
- a head actuated over the disk;
- and
- control circuitry configured to:
- sample a read signal from the head to generate signal samples;
- filter the signal samples with an equalizer filter to generate equalized samples;
- filter the equalized samples with an inter-track interference (ITI) filter to generate ITI attenuated samples;
- and
- detect a data sequence based on the ITI attenuated samples,
- wherein the ITI filter comprises a transfer function:
- 1−LPF(ek)
- where:
- ek represents a noise sequence in the equalized samples;
- and
- LPF represents a low pass filter operating on ek.
A method of operating a data storage device, the method comprising:
- sampling a read signal from a head actuated over a disk to generate signal samples;
- filtering the signal samples with an equalizer filter to generate equalized samples;
- filtering the equalized samples with an inter-track interference (ITI) filter to generate ITI attenuated samples;
- and
- detecting a data sequence based on the ITI attenuated samples,
- wherein the ITI filter comprises a transfer function:
- 1−HPF(ek)
- where:
- ek represents a noise sequence in the equalized samples;
- and
- HPF represents a high pass filter operating on ek.
A method of operating a data storage device, the method comprising:
- sampling a read signal from a head actuated over a disk to generate signal samples;
- filtering the signal samples with an equalizer filter to generate equalized samples;
- filtering the equalized samples with an inter-track interference (ITI) filter to generate ITI attenuated samples;
- and
- detecting a data sequence based on the ITI attenuated samples,
- wherein the ITI filter comprises a transfer function:
- 1−LPF(ek)
- where:
- ek represents a noise sequence in the equalized samples;
- and
- LPF represents a low pass filter operating on ek.
Dependencies are inferred from the claim text.