The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 03, 1990
Filed:
May. 24, 1988
Roland Mester, Darmstadt, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
8-bit data words and check words of a data block are supplied to an error recognition circuit the same time that they are written into a FIFO storage unit a word clock rate derived from the signals reproduced from a magnetic tape record which are subject to phase fluctuations. At the same time a counter is advanced by the same clock pulses. The error recognition circuit forms syndrome words by which each erroneous data word can be located and its address stored, as the state of the counter, into a register which is capable of registering more than one such address. The error recognition circuit also generates an error pattern multibit signal which is likewise stored in a register which can store more than one error pattern. Clock pulses of the same frequency as the write-in pulses but without fluctuations in phase are generated for read out of data blocks from the FIFO storage unit and for producing a train of pulses for clocking a second counter, the state of which is compared with the address or addresses stored in the first register, so that at the same time an erroneous word is read out from the FIFO unit the corresponding error pattern will be combined with the erroneous data word in an XOR correlation to provide the necessary correction of the erroneous word.