Double density read recovery

Details Double density read recovery Double density read recovery

1978-01-03

1980-07-08

Shaw, Gareth D.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

364900, 340347DD, H03K 1324, G11B 509

Patent

active

042120381

ABSTRACT:
A logic system requiring no tuning adjustments is provided for converting an MFM encoded information stream read from a mass storage medium to a non-return-to-zero (NRZ) information stream. The MFM encoded information stream is routed through an input shift register to provide plural information bit cells in parallel. Outputs of the shift register are sampled with a multiplexer to generate timing strobes for detecting an address mark, and for identifying clock bits, data bits and logic zero data appearing in the MFM encoded data field following the address mark. Clock bits are separated from the data, and both data bits and logic zero data are applied serially to an output shift register to form a serial NRZ data stream. Each time a data bit or logic zero data is loaded into the output shift register, a synchronization strobe is generated to transfer the NRZ data to succeeding systems.

REFERENCES:
patent: 3905029 (1975-09-01), McIntosh
patent: 3976996 (1976-07-01), Wu
patent: 4034348 (1977-07-01), Rathburn

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