Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1988-09-02
1989-10-03
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
370101, 370 84, G11B 509
Patent
active
048720739
ABSTRACT:
Data is received at a variable input rate and recorded on a longitudinal medium in the form of fixed length data blocks with variable length spacing between the blocks, utilizing a transducer mounted on a rotating scanner drum. The input data rate may change between various recording/playback operations by a ratio of 1:100 or more, but during a particular operation it remains constant. The data blocks played back from the medium are sequentially stored in a memory at the internal data transfer clock rate, which is also utilized to control the scanner rotation. The data is read from the memory at a constant rate which is adjusted for each particular operation. A memory status control signal is m provided indicating a predetermined level of fullness obtained by the memory. That control signal is compared in time to a control signal indicating occurrence of the beginning of a next data block. When these two control signals coincide, the average amounts of data entering the memory and being read from the memory are equal. When these average amounts differ, an error signal is generated, corresponding to the time difference between the two control signals. The control signal is applied to adjust the internal data transfer clock rate, and thereby also the scanner rotation to compensate for the time difference.
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IBM Technical Disclosure Bulletin/vol. 28 No. 5(10/85).
Fincher Jeffrey L.
Stephens Michael R.
Ampex Corporation
Canney Vincent P.
Fournier Kevin J.
Lange Richard P.
Strnad Elizabeth E.
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