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公开(公告)号：EP0081916A3
公开(公告)日：1983-10-05
申请号：EP82306097
申请日：1982-11-16
发明人： Sellars, Graham Paul
IPC分类号： G11B05/58
CPC分类号： G11B5/58 , G11B5/59622
摘要： A self-sealing differential signal decoder (50) which accepts first and second input signals and provides an output representative of the difference therebetween which is scaled as if the sum of the input signals were equal to a predetermined value, avoids slow A.G.C. systems and sequence control systems, being operable at up to video speed by exploiting the properties of a differential long-tail pair amplifier (72, 74, 76) where the ratio between its output currents is proportional to the antilogarithm of the difference between its input voltages and the sum of the output currents is equal to the controlled value of a constant current source (76), the input to the long-tail pair being provided by a differential logarithmic amplifier (56, 58, 66, 68) and the decoder (50) being employed in a tribit servo signal reader.
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公开(公告)号：EP0077643A3
公开(公告)日：1983-08-10
申请号：EP82305462
申请日：1982-10-14
CPC分类号： G11B7/0908 , G11B7/0917
摘要： A laser optical system including a reading beam for reading optical data recorded in one or more tracks of a rotating disk optical recording medium. The disk includes a plurality of preformatted headers spaced along the track wherein each header includes a plurality of spaced focusing optical holes having dimensions chosen based on the diameter of the focused laser beam spot. Traversal of these optical holes by the reading beam produces a reflected beam which varies in a manner dependent upon the quality of focusing of the beam. Peak detection circuitry responsive to this reflected beam is used to produce a high gain focusing signal which is combined with a low gain, high capture range focusing signal provided by a geometric focus detector to derive a precise, offset-free focusing control signal which is applied to a focusing motor to main precise focusing of the beam on the disk.
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公开(公告)号：EP0077642A3
公开(公告)日：1983-08-10
申请号：EP82305461
申请日：1982-10-14
CPC分类号： G11B7/08 , G11B7/004 , G11B7/09 , G11B20/1217 , G11B20/1879 , G11B27/30 , G11B2220/2537
摘要： A three beam laser optical system comprising a writing beam and two reading beams all incident on the same track of a rotating disk optical recording medium. One of the reading beams is incident on the track ahead of the writing beam so as to serve as a read-before-write beam, while the other reading beam is incident on the track behind the recording beam so as to serve as a read-after-write beam. The read-before-write beam is used during the recording of data to provide an advance indication as to whether there is previously recorded data ahead of the writing beam, in which case the recording operation is interrupted to prevent an overwrite error. The read-after write beam is used during recording to check the accuracy of the recording operation.
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公开(公告)号：EP0077644A3
公开(公告)日：1983-08-03
申请号：EP82305463
申请日：1982-10-14
CPC分类号： G11B7/0938 , G11B7/00745 , G11B7/0901 , G11B7/24085
摘要： A laser optical system including a reading beam for reading optical data recorded in one or more tracks of a rotating disk optical recording medium. The disk includes a plurality of preformatted headers spaced along the track wherein each header includes first and second track following optical holes which are elongated in the direction of the track and disposed on opposite sides of the track center line in a staggered relationship along the track. Traversal of these track following holes by the reading beam produces a reflected beam which varies in a manner dependent upon the accuracy of positioning of the beam relative to the track center line. Up-down integration circuitry responsive to this reflected beam is used to produce a track following signal which is applied to a radial position control motor for maintaining the beam precisely on the track center line.
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公开(公告)号：EP0083193A1
公开(公告)日：1983-07-06
申请号：EP82306814.3
申请日：1982-12-20
CPC分类号： G11B7/24085 , G11B7/0045 , G11B7/00745 , G11B7/12
摘要： An apparatus for preformatting each track of an optical disk with spaced header patterns (61) using a plurality of overlapping, individually modulated writing laser beams (65a, b, c) arranged in a line perpendicular to the track. All of the writing laser beams are derived from a single multi-line laser (90) so as to provide high positioning stability, and adjacent beams are chosen to have different wavelengths in order to prevent the deleterious effects of coherent interference between the overlapping beams. A specific header pattern (61) is provided on a single pass by turning on different ones of the writing beams during specific time periods as each header recording area is traversed. A laser read-after-write beam (65d) is additionally provided to permit immediate verification of the recorded header pattern.
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公开(公告)号：EP0081821A1
公开(公告)日：1983-06-22
申请号：EP82111436.0
申请日：1982-12-09
IPC分类号： H04L11/16
CPC分类号： H04L12/4625
摘要： An interconnection circuitry (12), for two local area contention networks (10) which is adapted to jam the respective networks when stations (11) on both sides of the interconnection circuitry attempt transmission. If stations on opposite sides of the interconnect circuitry begin transmitting at the same time, the interconnect circuitry operates to place a high signal on the channel of each network and all stations will detect that the data is garbled and discard it.
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公开(公告)号：EP0076269A1
公开(公告)日：1983-04-13
申请号：EP82900906.0
申请日：1982-02-18
发明人： POTASH, Hanan
CPC分类号： G06F9/4812 , G06F9/3851 , G06F9/4881
摘要： L'execution serielle de taches dans un systeme de dispositif numerique interconnecte (10, 11-1 jusqu'a 11-N) s'est revele etre inefficace. De telles taches sont representees par des mots de commande de tache, arranges en une pluralite de groupes, qui sont stockes dans une memoire de commande (13) et executes par une unite logique (20). Grace au multiplexage temporel de l'execution de ces taches par l'utilisation de files d'attente d'entree (24) et de sortie (22) pour le stockage de messages d'entree (23) et de sortie (21) de deux types transferes entre ces dispositifs numeriques (10, 11-1 jusqu'a 11-N), l'on obtient une execution parallele de ces taches ainsi qu'un fonctionnement beaucoup plus efficace. Quelques uns de ces messages ne necessitent pas de reponse tandis que pour ces messages qui necessitent une reponse, des signaux d'adresse de reprise (29, 37) sont inclus dans les messages (31, 36) transferes par le bus (12) reliant les dispositifs numeriques.
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78.发明公开Reduction processor for executing programs stored as treelike graphs employing variable-free applicative language codes 失效用于执行程序的减少处理程序存储为使用无变体应用语言代码的TREELIKE GRAPHS
公开(公告)号：EP0069313A3
公开(公告)日：1983-03-30
申请号：EP82105702
申请日：1982-06-28
发明人： Bolton, Brent Cecil , Hagenmaier, Carl Fredrick, Jr. , Logsdon, Gary Lee , Miner, Robert Lawrence, Jr.
IPC分类号： G06F09/44
CPC分类号： G06F9/4494
摘要： This disclosure relates to a reduction processor for the evaluation of one or more functions which are stored in memory in the form of a series of nodes of a treelike graph where the nodes implement a variable-free applicative language. The respective function operators are reduced through a progressive series of transformations or substitutions until a result is obtained. During the reduction process, the processor transfers nodes to and from memory and performs various operations as required on those nodes. The processor can also create new nodes in memory and delete unused ones.
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79.发明公开Microprogrammed digital data processing system employing multiphase subroutine control for concurrently executing tasks 失效Mikroprogrammiertes digitales Datenverarbeitungssystem mit einer MehrphasenunterprogrammsteuerungfürParallelbetrieb。
公开(公告)号：EP0059810A1
公开(公告)日：1982-09-15
申请号：EP81304887.3
申请日：1981-10-20
发明人： Dongsung, Robert Kim
CPC分类号： G06F9/4825
摘要： A microprogrammed data processing system providing synchronized multi-phase subroutine control for a plurality of concurrently executing tasks operating at a microinstruction level in a multiprocessing and multiprogramming environment. Tasks and subroutine control operations are staged to employ common hardware in a manner which provides the effect of a plurality of separate processors operating concurrently on different tasks in a multi-phased manner.
摘要翻译： 一种微程序数据处理系统，为在多处理和多程序设计环境中的微指令级操作的多个并行执行任务提供同步的多相子程序控制。 分阶段执行任务和子程序控制操作以以多阶段方式提供在不同任务上同时运行的多个单独处理器的效果的方式来使用通用硬件。
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公开(公告)号：EP0059727A1
公开(公告)日：1982-09-15
申请号：EP81902472.0
申请日：1981-09-07
CPC分类号： G11B5/59677
摘要： Un servo mecanisme de positionnement d'une tete positionne une tete de lecture/ecriture (16) sur un disque rotatif, magnetique de stockage de donnees d'information (10). Comme element de reaction de position, il utilise une detente optique a deux phases (22, 24). Il elimine les erreurs de positionnement dues aux erreurs de phase entre les deux signaux d'indication de position en ayant la distance de repetition des deux signaux depuis la detente (22, 24) egale a l'espacement regulier entre les pistes de donnees sur le disque (10). L'une des pistes est une servo piste (14). Un selecteur (25) assure exclusivement le positionnement de la tete (16) d'apres le signal de reaction de position des deux disponibles, qui amenent la tete (16) sur la servo piste (14) avec la plus petite erreur. Le positionnement s'effectue par correction de l'erreur par l'intermediaire d'un convertisseur D/A (30). La situation est controlee de temps en temps par un controleur (34).
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