Self-timing qualification channel

Details Self-timing qualification channel Self-timing qualification channel

1989-08-18

1990-12-18

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375102, 375103, 375110, 360 51, 307350, 307351, H03K 5153

Patent

active

049791893

ABSTRACT:
A novel self-timing qualification channel structure is taught, suitable for use in detecting data from a magnetic disk or other storage medium. A timing comparator is used in addition to a hysteresis comparator in order to detect when the true peak of the input signal is about to occur. The timing comparator output determines when signal qualification by the hysteresis comparator is to occur. The timing comparator only allows signal qualification to occur just prior to the true peak in the input signal. Because of this, the risk of falsely detecting off track noise or noise in the shoulder region is greatly reduced. In one embodiment, the timing comparator operates without the need for additional external components by utilizing the existing channel filter. Thus, the channel filter serves two purposes: to filter the channel input signal prior to detection and to provide delay for the timing comparator. The detector of this invention is ideally suited for detecting data from a constant density recording environment where a multiple data rates are encountered. The improved immunity to off track noise allows track density to be increased, thereby increasing the storage capacity of the disk.

REFERENCES:
patent: 3588714 (1971-06-01), McIntosh
patent: 4216543 (1980-08-01), Cagle et al.
patent: 4507795 (1985-03-01), Wagner
patent: 4675880 (1987-01-01), Davarian
patent: 4780888 (1988-10-01), Solhjell et al.
patent: 4876697 (1989-10-01), Whitfield
patent: 4878029 (1989-10-01), Saulnier et al.
National Semiconductor Advanced Peripherals Mass Storage Handbook (1988) DP8461/65 Data Separator, DP8451/55 Data Synchronizer.
National Semiconductor Advanced Peripherals Mass Storage Handbook (1988) DP8469 Synchronizer/2,7 Endec.
National Semiconductor Advanced Peripherals Mass Storage Handbook (1988) Disk Interface Design Guide and Users Manual.

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