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公开(公告)号：DE60315617D1
公开(公告)日：2007-09-27
申请号：DE60315617
申请日：2003-03-14
Applicant: IBM
Inventor： GALBRAITH RICHARD LEO
Abstract: A multi-pole electric pulse generator contains poles having a pseudo-random distribution. Preferably, poles are equally sized and spaced, and polarity corresponds to a pseudo-noise binary sequence, which is specifically a primitive polynomial m-sequence. At one point in the rotor's revolution, all rotor poles are aligned with corresponding stator poles to provide maximum net magnetic flux through the armature windings. At all other rotor positions, the poles are misaligned so that the net flux through the armature windings is small. In operation, rotation through the misaligned rotor positions produces essentially no flux change so that no electric power is generated. When the rotor reaches the aligned position, there is a sudden, large flux change which generates a high-energy electric pulse. The exemplary application is for generating an ignition spark of an internal combustion engine.
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公开(公告)号：CA2479965A1
公开(公告)日：2003-10-09
申请号：CA2479965
申请日：2003-03-14
Applicant: IBM
Inventor： GALBRAITH RICHARD LEO
Abstract: A multi-pole electric pulse generator contains poles having a pseudo-random distribution. Preferably, poles are equally sized and spaced, and polarity corresponds to a pseudo-noise binary sequence, which is specifically a primitive polynomial m-sequence. At one point in the rotor's revolution, all rotor poles are aligned with corresponding stator poles to provide maximum n et magnetic flux through the armature windings. At all other rotor positions, t he poles are misaligned so that the net flux through the armature windings is small. In operation, rotation through the misaligned rotor positions produce s essentially no flux change so that no electric power is generated. When the rotor reaches the aligned position, there is a sudden, large flux change whi ch generates a high-energy electric pulse. The exemplary application is for generating an ignition spark of an internal combustion engine.
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公开(公告)号：DE69327618T2
公开(公告)日：2000-07-06
申请号：DE69327618
申请日：1993-06-30
Applicant: IBM
Inventor： COKER JONATHAN DARREL , GALBRAITH RICHARD LEO
IPC: G11B5/00 , G11B5/012 , G11B5/09 , G11B5/84 , G11B19/04 , G11B20/10 , G11B20/18 , G11B33/10 , G06F11/00
Abstract: The invention provides a circuit and method for performing test procedures on a data storage and recovery system for a magnetic storage unit. Error sample values from a read operator in a data storage and recovery system are applied to a first and a second process path to generate output signals. A source of level samples of a logical data level is also provided. The first process path generates an output signal comprising the square of each error value sample. The second process path compares the error value samples and a compare level and generates an output signal comprising a result of each comparison. The output signal of the first process path, the second process path, or the level samples is selected and is associated with a data type. In response to a coincidence of a data type associated with the selected signal with a desired data type, the selected signal is gated and then accumulated. The window during which the selected signal is accumulated may vary. The accumulated value is used as an input variable to a selected test to determine the accuracy of the data storage and recovery system.
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公开(公告)号：SG44479A1
公开(公告)日：1997-12-19
申请号：SG1996000768
申请日：1992-12-22
Applicant: IBM
Inventor： GALBRAITH RICHARD LEO
Abstract: Apparatus and methods are provided for encoding a predefined number of bits of binary data into codewords having a predefined number of bits for a partial-response maximum-likelihood (PRML) data channel in a direct access storage device (DASD). Rate 8/9 block codes having maximum ones and run length constraints (0,8,12, INFINITY ) and (0,8,6, INFINITY ) provide timing and gain control and reduced susceptibility to misequalization effects in PRML channels.
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