Data stream smoothing method and circuit for a tape drive

Details Data stream smoothing method and circuit for a tape drive Data stream smoothing method and circuit for a tape drive

1992-05-28

1996-07-02

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 46, G11B 509

Patent

active

055328865

ABSTRACT:
A data smoother for a streaming cartridge tape drive including a data separator circuit for generating a clock signal and a second phase-locked loop circuit for removing frequency modulation arising from instantaneous speed variation (ISV) errors. The broad-band data separator follows all of the ISV generated by the cartridge tape drive to permit detection and correction of cell-slippage in a First-In-First-Out (FIFO) circuit, which accepts the data and clock signal from the data separator. The second PLL has a narrow bandwidth filter that smoothes the clock signal and removes all high-frequency ISV modulation from the data as it is clocked out from the FIFO circuit. The MFM data signal is regenerated by a monostable multivibrator in synchronism with the smoothed clock signal.

REFERENCES:
patent: 4644420 (1987-02-01), Buchan
patent: 4729025 (1988-03-01), Yanase
patent: 4837643 (1989-06-01), Tierney, III
patent: 5003408 (1991-03-01), Farkas et al.
patent: 5093732 (1992-03-01), Yoshinaka

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