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公开(公告)号：EP1033872B1
公开(公告)日：2009-01-07
申请号：EP00301525.2
申请日：2000-02-25
申请人： Hitachi, Ltd.
IPC分类号： H04N5/44
CPC分类号： H04N21/4345 , H04N5/4401 , H04N21/4384
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公开(公告)号：EP1033872A2
公开(公告)日：2000-09-06
申请号：EP00301525.2
申请日：2000-02-25
申请人： Hitachi, Ltd.
IPC分类号： H04N5/44
CPC分类号： H04N21/4345 , H04N5/4401 , H04N21/4384
摘要： When searching a receivable physical channel, because the searching is held from a low or a high frequency of the physical channel in order, it takes a long time until finishing the search.
Searching a physical channel which is very frequently used with priority using a physical channel distribution information, based upon the searched physical channel, extracting other physical channel information in the transmission from a transport stream, and searching only a physical channel that the receiving is expecting based upon the extracted other physical channel information.摘要翻译： 当搜索可接收的物理信道时，由于搜索是按照物理信道的低频或高频率进行的，所以在完成搜索之前需要很长时间。 基于搜索到的物理信道，使用物理信道分发信息搜索非常频繁使用的物理信道，从传输流中提取传输中的其他物理信道信息，并仅搜索接收期望的物理信道 提取出其他物理信道信息。
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公开(公告)号：EP0156305B1
公开(公告)日：1992-07-22
申请号：EP85103294.6
申请日：1985-03-21
申请人： HITACHI, LTD.
发明人： Noda, Tsutomu , Iso, Yoshimi , Sato, Tetsuo
IPC分类号： H03M1/82
CPC分类号： G11B20/10527 , G11B20/00992 , H03M1/82
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公开(公告)号：EP1033872A3
公开(公告)日：2001-05-23
申请号：EP00301525.2
申请日：2000-02-25
申请人： Hitachi, Ltd.
IPC分类号： H04N5/44
CPC分类号： H04N21/4345 , H04N5/4401 , H04N21/4384
摘要： When searching a receivable physical channel, because the searching is held from a low or a high frequency of the physical channel in order, it takes a long time until finishing the search. Searching a physical channel which is very frequently used with priority using a physical channel distribution information, based upon the searched physical channel, extracting other physical channel information in the transmission from a transport stream, and searching only a physical channel that the receiving is expecting based upon the extracted other physical channel information.
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公开(公告)号：EP0156305A3
公开(公告)日：1989-02-08
申请号：EP85103294.6
申请日：1985-03-21
申请人： HITACHI, LTD.
发明人： Noda, Tsutomu , Iso, Yoshimi , Sato, Tetsuo
IPC分类号： H03M1/82
CPC分类号： G11B20/10527 , G11B20/00992 , H03M1/82
摘要： A digital-to-analogue converter for use in a digitally-recorded-signal reproducing apparatus comprises a first constant current source (5, 11, 12; 42, 43, 44), a switch (4; 13, 14; 45, 46, 47) for allowing the constant current of the first constant current source to flow therethrough for a period corresponding to the digital data, a second constant current source (26; 36; 55; 60) generating a current flowing in the direction opposite to that of the current generated by the first constant current source, a switch (27; 37; 56; 61) for allowing the current of the second constant current source to flow therethrough for a predetermined constant period, and an integrator (7,8,9), wherein the sum of the first and second constant currents is integrated by the integrator. The analogue signal outputted by the integrater has a center level in the vicinity of the ground potential level.
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公开(公告)号：EP0087718B1
公开(公告)日：1986-06-11
申请号：EP83101658.9
申请日：1983-02-21
申请人： Hitachi, Ltd.
发明人： Iso, Yoshimi , Inoue, Shigeki , Noda, Tsutomu , Ohashi, Shinichi
CPC分类号： G11B21/106 , G11B7/0903
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公开(公告)号：EP0129236B1
公开(公告)日：1990-09-12
申请号：EP84106953.7
申请日：1984-06-18
申请人： HITACHI, LTD.
CPC分类号： G11B20/10527 , H03M1/1019 , H03M1/504 , H04B14/04
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公开(公告)号：EP0129236A3
公开(公告)日：1988-01-07
申请号：EP84106953
申请日：1984-06-18
申请人： HITACHI, LTD.
CPC分类号： G11B20/10527 , H03M1/1019 , H03M1/504 , H04B14/04
摘要： A signal conversion apparatus for use in a PCM signal processing system in which a series of multi-bit digital signals is produced through sampling and quantization of a multi-channel analog signal. The series of multi-bit digital signals (e.q., 109) includes groups of multi-bit digital signals (e.g., 107, 108) being representative of respective analog signal portions (3, 4) constituting the multi-channel analog signal. The apparatus comprises a translating section (e.g., 121) for producing substitutional multi-bit digital signals (122) from at least one (107) of the groups of digitals corresponding to at least one analog signal portion (3), which substitutional digital signals represent amplitudes of the one analog signal portion at sampling points different from those at which the one analog signal was sampled to provide the one group of digital signals The substitutional digital signals are substituted, in the translating section, forthe one group of the digital signals to produce a corresponding group of sampling point- shifted multi-bit digital signals (122) The resulting PCM multi-bit digital signals (109) are acceptable by digital-to-analog conversion processor requiring PCM digital signals generated through sampling at shifted or different sampling points as compared with the above-mentioned series of digital signals
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9.发明公开
公开(公告)号：EP0129236A2
公开(公告)日：1984-12-27
申请号：EP84106953.7
申请日：1984-06-18
申请人： HITACHI, LTD.
CPC分类号： G11B20/10527 , H03M1/1019 , H03M1/504 , H04B14/04
摘要： A signal conversion apparatus for use in a PCM signal processing system in which a series of multi-bit digital signals is produced through sampling and quantization of a multi-channel analog signal. The series of multi-bit digital signals (e.q., 109) includes groups of multi-bit digital signals (e.g., 107, 108) being representative of respective analog signal portions (3, 4) constituting the multi-channel analog signal. The apparatus comprises a translating section (e.g., 121) for producing substitutional multi-bit digital signals (122) from at least one (107) of the groups of digitals corresponding to at least one analog signal portion (3), which substitutional digital signals represent amplitudes of the one analog signal portion at sampling points different from those at which the one analog signal was sampled to provide the one group of digital signals The substitutional digital signals are substituted, in the translating section, forthe one group of the digital signals to produce a corresponding group of sampling point- shifted multi-bit digital signals (122) The resulting PCM multi-bit digital signals (109) are acceptable by digital-to-analog conversion processor requiring PCM digital signals generated through sampling at shifted or different sampling points as compared with the above-mentioned series of digital signals
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10.发明公开Tracking servo control unit for an information reproducing apparatus 失效Spurfolge-Servosteuereinheitfürein信息 - Wiedergabegerät。
公开(公告)号：EP0087718A1
公开(公告)日：1983-09-07
申请号：EP83101658.9
申请日：1983-02-21
申请人： Hitachi, Ltd.
发明人： Iso, Yoshimi , Inoue, Shigeki , Noda, Tsutomu , Ohashi, Shinichi
CPC分类号： G11B21/106 , G11B7/0903
摘要： In an information reproducing apparatus having a tracking servo control loop for causing an information reading unit including means for detecting a tracking error signal for tracking an information bearing track on a disc, to track the information bearing track in accordance with the tracking error signal to reproduce information in accordance with an information signal read by the information reading unit, a circuit (1, 2, 3, 4, 5, 10, 17) for extracting a discrimination signal for discriminating a negative feedback region of the tracking error signal is provided so that a tracking servo control loop is closed (11) in the negative feedback region.
摘要翻译： 在具有跟踪伺服控制环路的信息重放装置中，用于使信息读取单元包括用于检测用于跟踪盘上的信息承载轨迹的跟踪误差信号的装置，以根据跟踪误差信号跟踪信息承载轨迹以再现 根据由信息读取单元读取的信息信号的信息，提供用于提取用于鉴别跟踪误差信号的负反馈区域的判别信号的电路（1,2,3,4,5,10,17）， 跟踪伺服控制环在负反馈区域中闭合（11）。
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