Excavating
Patent
1988-08-22
1990-08-21
Smith, Jerry
Excavating
360 25, 360 7712, 371 55, 377 50, G11B 2018, G11B 15467
Patent
active
049512820
ABSTRACT:
A PROM has inupts from error detecting and processing equipment of the signal reproducing channels of equipment reproducing digital signals from magnetic tape and can be controlled to process selectively the recognition of errors and of their respective natures by the error detecting and correcting circuits. The error detection circuits also provide a block end signal at the end of every block of data of the digital signal being processed which is protected against errors by check words. At every block end signal the output of the PROM is transferred to a first register, the contents of which are made available to an adder for adding these contents to the contents of the second register (10) and the output of the adder is written into the second register, either without change or after division by two by a switch (12), to the output of the second register. A third register controls the extent counting of a counter (13) which counts out a set number of block end signals before putting the switch for one interval into its division by two position and at substantially the same time transferring the contents of the third register to other equipment which may be used to adjust the counter to maintain the contents of the register 10 within its mid range, in effect by controlling the intervals over which averaging the error information is performed. The evaluated output of the third register is an indication of the quality of the digital signal. That indication may be used to optimize tracking adjustments of the tape reading equipment, optimizing adjustments of a distortion corrector, or the like, as well as observing the quality of the tape recording.
REFERENCES:
patent: 4255807 (1981-03-01), Cosby
"Proposed American National Standard for Component Digital Video Recording"-19-mm type D-1 Cassette-Tape Record, pp. SMPTE224M to STPTE228M.
Baker Stephen M.
Robert & Bosch GmbH
Smith Jerry
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