-
公开(公告)号：DE69411814T2
公开(公告)日：1999-03-25
申请号：DE69411814
申请日：1994-05-26
Applicant: IBM
Abstract: A system and method is provided for accurately reading and storing data as multiple data blocks on a removable data storage medium mounted within a data storage system. Each data block includes an initial acquisition data character and multiple diverse synchronization characters/bursts and adjacent data blocks are separated by a unique interblock gap character. A multimodal interblock gap character detection circuit is provided which may operate in a normal mode of operation or a stringent mode of operation, the stringent mode requiring an enhanced degree of certainty for detection of the interblock gap character. A predicted time window of occurrence for a next interblock gap character is generated in response to detection of an initial acquisition data character and at least one synchronization character within a data block. Additionally, a global clock count signal based upon multiple track outputs is generated each time a resynchronization burst is encountered. The multimodal interblock gap character detection circuit is then automatically switched from the stringent mode of operation to the normal mode of operation during the predicted time window, minimizing the possibility of erroneous interblock gap character detection during data block processing. In data blocks which are sufficiently large to utilize multiple unique end of block synchronization characters, the occurrence of each successive end of block synchronization character may be utilized to redefine the predicted time window with greater accuracy. Expiration of a predicted time window or the occurrence of a global clock count signal during an open predicted time window may then be utilized to generate a presumption of the occurrence of an interblock gap character; however, actual detection of the interblock gap character will override the prediction circuitry.
-
公开(公告)号：AU623724B2
公开(公告)日：1992-05-21
申请号：AU4766090
申请日：1990-01-03
Applicant: IBM
Abstract: A record medium, such as a magnetic tape, optical disk, magnetic disk, and the like stores data signals and error redundancy signals. Re-synchronisation signals are interleaved between the recorded signals such that the error redundancy signals are usable to correct signals recorded between such interposed re-synchronisation signals wherein no error redundancy signals are recorded. Error pointing redundancy signals are recorded between all of the re-synchronisation signals for pointing to signals in error for enhancing the error correction. Such error pointing signals can be cyclic redundancy check (CRC) signals. Controls for taking advantage of the above-described arrangement are also described. Reframing and clock synchronisation controls are also disclosed.
-
公开(公告)号：AU4766090A
公开(公告)日：1990-11-01
申请号：AU4766090
申请日：1990-01-03
Applicant: IBM
Abstract: A record medium, such as a magnetic tape, optical disk, magnetic disk, and the like stores data signals and error redundancy signals. Re-synchronisation signals are interleaved between the recorded signals such that the error redundancy signals are usable to correct signals recorded between such interposed re-synchronisation signals wherein no error redundancy signals are recorded. Error pointing redundancy signals are recorded between all of the re-synchronisation signals for pointing to signals in error for enhancing the error correction. Such error pointing signals can be cyclic redundancy check (CRC) signals. Controls for taking advantage of the above-described arrangement are also described. Reframing and clock synchronisation controls are also disclosed.
-
公开(公告)号：DE69411814D1
公开(公告)日：1998-08-27
申请号：DE69411814
申请日：1994-05-26
Applicant: IBM
Abstract: A system and method is provided for accurately reading and storing data as multiple data blocks on a removable data storage medium mounted within a data storage system. Each data block includes an initial acquisition data character and multiple diverse synchronization characters/bursts and adjacent data blocks are separated by a unique interblock gap character. A multimodal interblock gap character detection circuit is provided which may operate in a normal mode of operation or a stringent mode of operation, the stringent mode requiring an enhanced degree of certainty for detection of the interblock gap character. A predicted time window of occurrence for a next interblock gap character is generated in response to detection of an initial acquisition data character and at least one synchronization character within a data block. Additionally, a global clock count signal based upon multiple track outputs is generated each time a resynchronization burst is encountered. The multimodal interblock gap character detection circuit is then automatically switched from the stringent mode of operation to the normal mode of operation during the predicted time window, minimizing the possibility of erroneous interblock gap character detection during data block processing. In data blocks which are sufficiently large to utilize multiple unique end of block synchronization characters, the occurrence of each successive end of block synchronization character may be utilized to redefine the predicted time window with greater accuracy. Expiration of a predicted time window or the occurrence of a global clock count signal during an open predicted time window may then be utilized to generate a presumption of the occurrence of an interblock gap character; however, actual detection of the interblock gap character will override the prediction circuitry.
-
公开(公告)号：CA2112452C
公开(公告)日：1998-05-05
申请号：CA2112452
申请日：1989-10-02
Applicant: IBM
IPC: G06F11/10
Abstract: A record medium, such as a magnetic tape, optical disk, magnetic disk, and the like stores data signals and error redundancy signals. Resynchronization signals are inter-leaved between the recorded signals such that the error redundancy signals are usable to correct signals recorded between such interposed resynchronization signals wherein no error redundancy signals are recorded. Error pointing redundancy signals are recorded between all of the resynchro-nization signals for pointing to signals in error for enhancing the error correction. Such error pointing signals can be cyclic redundancy check (CRC) signals. Controls for taking advantage of the above-described arrangement are also described. Reframing and clock synchronization controls are also disclosed.
-
Patent Agency Ranking
公开(公告)号：DE69019590T2
公开(公告)日：1996-01-18
申请号：DE69019590
申请日：1990-03-08
Applicant: IBM
Abstract: A record medium, such as a magnetic tape, optical disk, magnetic disk, and the like stores data signals and error redundancy signals. Re-synchronisation signals are interleaved between the recorded signals such that the error redundancy signals are usable to correct signals recorded between such interposed re-synchronisation signals wherein no error redundancy signals are recorded. Error pointing redundancy signals are recorded between all of the re-synchronisation signals for pointing to signals in error for enhancing the error correction. Such error pointing signals can be cyclic redundancy check (CRC) signals. Controls for taking advantage of the above-described arrangement are also described. Reframing and clock synchronisation controls are also disclosed.
-
公开(公告)号：BR9001936A
公开(公告)日：1991-07-30
申请号：BR9001936
申请日：1990-04-26
Applicant: IBM
Abstract: A record medium, such as a magnetic tape, optical disk, magnetic disk, and the like stores data signals and error redundancy signals. Re-synchronisation signals are interleaved between the recorded signals such that the error redundancy signals are usable to correct signals recorded between such interposed re-synchronisation signals wherein no error redundancy signals are recorded. Error pointing redundancy signals are recorded between all of the re-synchronisation signals for pointing to signals in error for enhancing the error correction. Such error pointing signals can be cyclic redundancy check (CRC) signals. Controls for taking advantage of the above-described arrangement are also described. Reframing and clock synchronisation controls are also disclosed.
-
-
公开(公告)号：DE69019590D1
公开(公告)日：1995-06-29
申请号：DE69019590
申请日：1990-03-08
Applicant: IBM
Abstract: A record medium, such as a magnetic tape, optical disk, magnetic disk, and the like stores data signals and error redundancy signals. Re-synchronisation signals are interleaved between the recorded signals such that the error redundancy signals are usable to correct signals recorded between such interposed re-synchronisation signals wherein no error redundancy signals are recorded. Error pointing redundancy signals are recorded between all of the re-synchronisation signals for pointing to signals in error for enhancing the error correction. Such error pointing signals can be cyclic redundancy check (CRC) signals. Controls for taking advantage of the above-described arrangement are also described. Reframing and clock synchronisation controls are also disclosed.
-
公开(公告)号：NZ232174A
公开(公告)日：1992-05-26
申请号：NZ23217490
申请日：1990-01-19
Applicant: IBM
Abstract: A record medium, such as a magnetic tape, optical disk, magnetic disk, and the like stores data signals and error redundancy signals. Re-synchronisation signals are interleaved between the recorded signals such that the error redundancy signals are usable to correct signals recorded between such interposed re-synchronisation signals wherein no error redundancy signals are recorded. Error pointing redundancy signals are recorded between all of the re-synchronisation signals for pointing to signals in error for enhancing the error correction. Such error pointing signals can be cyclic redundancy check (CRC) signals. Controls for taking advantage of the above-described arrangement are also described. Reframing and clock synchronisation controls are also disclosed.
-
-
-
-
-
-
-
-
-
Search Results
10
records
(took 0.017 seconds)
