Dynamic magnetic information storage or retrieval – Modulating or demodulating
Patent
1998-04-01
2000-12-19
Kim, W. Chris
Dynamic magnetic information storage or retrieval
Modulating or demodulating
360 46, 360 65, G11B 502, G11B 509, G11B 5035
Patent
active
061634190
ABSTRACT:
A hard disk drive system (10) includes a read head (21) for reading information from a rotating magnetic disk (12). The read head outputs a servo burst signal in response to servo information (59) on the disk. An analog-to-digital converter (33) is provided to oversample the servo burst signal during each of a plurality of successive time intervals, in order to obtain a plurality of samples for each such time interval. An accumulator (74) is provided to sum the samples for each time interval, in order to obtain for each time interval a respective accumulation value that represents an integration of the burst signal for that time interval. A filtering circuit (86) is provided to determine a burst value for the servo burst signal, by applying a filtering function to a set of the accumulation values. The filtering function may involve determining a median accumulation value from the set of accumulation values, or determining a mean of the accumulation values in the set.
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patent: 5793556 (1998-08-01), Freitas
patent: 5854714 (1998-12-01), Reed et al.
Nagaraj, et al., "A Median Peak Detecting Analog Signal Processor for Hard Disk Drive Servo", Journal of Solid-State Circuits, vol. 30, No. 4, Apr. 1995, pp. 461-470.
Tuttle, et al., "A 130MB/s PRML Read/Write Channel with Digital-Servo Detection", 1996 IEEE International Solid-State Circuits Converence, pp. 48-49, 64-65 and 419.
Alini, et al., "SA19.3: A 200MSample/s Trellis-Coded PRML Read/Write Channel with Digital Servo", 1997 IEEE International Solid-State Circuits Conference, pp. 318-319, 478.
Huang, et al. "SA19.7: A 20MHZ BiCMOS Peak Detect Pulse Qualifier and Area Detect Servo Demodulator for Hard Disk Drive Servo Loop", 1997 IEEE International Solid-State Circuits Conference, pp. 326-327.
Iroaga Echere
Sobey Charles H.
Brady III Wade James
Kim W. Chris
Swayze, Jr. W. Daniel
Telecky Jr. Frederick J.
Texas Instruments Incorporated
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