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1.发明授权Method and apparatus for recording and reproducing a plurality of bits on a magnetic tape 失效用于在磁带上记录和再现多个位的方法和装置
公开(公告)号：US4302783A
公开(公告)日：1981-11-24
申请号：US100344
申请日：1979-12-05
CPC分类号： G11B5/09 , G11B20/1803 , G11B20/20
摘要： At least one bit of a digital signal including a plurality of bits to be simultaneously recorded on a plurality of tracks of a magnetic tape, is recorded on at least two tracks located at opposite sides with respect to a reference track. The reference track carries a reference signal utilized for producing a synchronous signal with which the plurality of bits are reproduced in synchronization. When reproducing, a.c. signals derived from the two corresponding tracks having the simultaneously recorded bits are added to each other whereby the phase difference of the plurality of bits with respect to the reference signal is compensated while drop out phenomenon is reduced.
摘要翻译： 包括要同时记录在磁带的多个轨道上的多个位的数字信号的至少一位被记录在相对于参考轨道位于相对侧的至少两个磁道上。 参考轨道携带用于产生同步信号的参考信号，同步信号同步地再现多个位。 再现时， 从具有同时记录的比特的两个对应轨道导出的信号彼此相加，从而相对于参考信号的多个比特的相位差被补偿，同时丢弃现象减少。
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2.发明授权Method and apparatus for encoding low redundancy check words from source data 失效用于从源数据编码低冗余校验字的方法和装置
公开(公告)号：US4375100A
公开(公告)日：1983-02-22
申请号：US199703
申请日：1980-10-23
CPC分类号： H03M13/29 , G11B20/1809 , G11B20/1876
摘要： Source data is organized by a time compression memory (4) into a plurality of successive groups of data words arranged in a pattern of rows and columns with the rows corresponding to respective recording tracks. A plurality of successive groups of parity check words is provided in the same pattern of rows and columns as the data words subsequent to the data word groups. Each parity check word is derived in a parity generator (6) by modulo-2 summations from the data words selected from different data word groups. The data and check words of each row of each respective group are (a) preceded by a synchronization code provided by a sync generator (10) to allow differentiation between data and parity groups, and (b) followed by a cyclic redundancy check, (CRC) code provided by a CRCC generator (9) to allow detection of an error in that data row or check words. The parity check word is used to correct an error specified by the CRC code upon detection of an error.
摘要翻译： 源数据由时间压缩存储器（4）组织成以与各个记录磁道相对应的行和列的图案排列的多个连续的数据字组。 多个连续的奇偶校验字组被提供在与数据字组后面的数据字相同的行和列的模式中。 每个奇偶校验字通过从不同数据字组中选择的数据字的模2求和在奇偶生成器（6）中导出。 每个相应组的每行的数据和检查字是（a）在由同步发生器（10）提供的同步码之前，以允许数据和奇偶校验组之间的区分，以及（b）后跟循环冗余校验（ CRC）代码由CRCC发生器（9）提供，以允许检测该数据行中的错误或检查字。 奇偶校验字用于在检测到错误时纠正由CRC码指定的错误。
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公开(公告)号：US4146099A
公开(公告)日：1979-03-27
申请号：US823705
申请日：1977-08-11
CPC分类号： G11B20/1813
摘要： Signal recording method and apparatus for efficiently correcting a bit error due to dropout occurred in recording an analog data into a digital data and reproducing the digital data is disclosed. The digital signal converted from the analog signal is divided into a plurality of groups to each of which a parity check bit is added. Record pattern is recorded on a record medium by a recording apparatus in accordance with a regular coding such as FM (frequency modulation) or MFM (modified frequency modulation) coding such that more than one bits in a group are not simultaneously influenced by the dropout, e.g. individual bits in a group are spaced from each other by several tracks. On reproducing, the coded digital signal is decoded into the original digital signal and the dropout is detected utilizing the nature of the regularity of the coding. The parity is checked for each of the groups. In this a single error in the group can be corrected and a double error is supplemented by holding a previous value, whereby the error due to the dropout is reduced.
摘要翻译： 公开了一种用于在将模拟数据记录到数字数据并再现数字数据时发生的用于有效地校正由于压差引起的位误差的信号记录方法和装置。 从模拟信号转换的数字信号被分成多个组，每个组中加上奇偶校验位。 根据诸如FM（频率调制）或MFM（修改的频率调制）编码的常规编码，记录装置将记录模式记录在记录介质上，使得一组中多于一位不同时受到丢失的影响， 例如 组中的各个位彼此间隔几个轨道。 在再现时，编码的数字信号被解码成原始数字信号，并且利用编码的规律性的特性来检测压差。 检查每个组的奇偶校验。 在这种情况下，可以纠正组中的单个错误，并通过保持先前的值来补充双重错误，从而降低由于退出引起的错误。
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公开(公告)号：US4809087A
公开(公告)日：1989-02-28
申请号：US124434
申请日：1987-11-23
摘要： In a magnetic recording and reproducing device having at least one rotating magnetic head for recording and reproducing video signal and digital form audio signal in a contiguous manner along each track which is inclined at an angle relative to the direction of travel of a magnetic tape, a discriminator signal is combined to the digital form audio signal. The discrimination signal has a first section carrying a check code and a second section carrying information. During the reproducing mode, the discrimination signal is detected such that the information carried in the second section is made invalid when the check code has a predetermined code pattern, and the information carried in the second section is made valid when the check code has a code pattern other than the predetermined code pattern. Furthermore, the check code is used to indicate the type of information contained in the second section.
摘要翻译： 在具有至少一个旋转磁头的磁记录和再现装置中，用于以相对于磁带行进方向倾斜一个角度的每个轨迹以连续的方式记录和再现视频信号和数字形式的音频信号， 鉴频器信号被组合到数字形式的音频信号。 鉴别信号具有携带检查码的第一部分和携带信息的第二部分。 在重放模式下，检测识别信号，使得当检查码具有预定的码型时，在第二部分中携带的信息变得无效，并且当检查码具有代码时，在第二部分中携带的信息有效 图案以外的预定代码图案。 此外，检查码用于指示第二部分中包含的信息的类型。
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公开(公告)号：US4544962A
公开(公告)日：1985-10-01
申请号：US394766
申请日：1982-07-02
申请人： Misao Kato , Yasuharu Shimeki , Hiroshi Matsushima , Shiro Tsuji , Nobuyoshi Kihara , Yoshinori Amano
发明人： Misao Kato , Yasuharu Shimeki , Hiroshi Matsushima , Shiro Tsuji , Nobuyoshi Kihara , Yoshinori Amano
CPC分类号： H04L25/4908 , G11B20/1426
摘要： A method is disclosed for processing binary data prior to magnetic recording. The binary data is divided into 4-bit data segments which are converted to 8-bit codes according to a predetermined encoding transfer function describing the relationships between the 4-bit data segments and corresponding 8-bit codes, wherein the bit pattern of each 8-bit code has an intra-code run-length of at least two "0" bits and forms an inter-code run-length of from at least two "0" bits to at most nine "0"bits with an adjacent 8-bit code. The method further includes the step of generating a frame synchronization code and interleaving it with 8-bit codes to form a frame of binary digits. The frame sync code has a bit pattern which is unduplicatable by any combination of 8-bit codes that follow.
摘要翻译： 公开了用于在磁记录之前处理二进制数据的方法。 根据描述4位数据段和对应的8位代码之间的关系的预定编码传递函数将二进制数据划分为4位数据段，将其转换为8位代码，其中每8位数据段的位模式 比特码具有至少两个“0”比特的码内游程长度，并且形成从至少两个“0”比特到最多九个“0”比特的码间游程长度， 位代码。 该方法还包括产生帧同步码并用8位代码进行交织以形成二进制数字的帧的步骤。 帧同步码具有通过随后的8位代码的任何组合不可重复的位模式。
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公开(公告)号：US3936752A
公开(公告)日：1976-02-03
申请号：US373171
申请日：1973-06-25
申请人： Kaoru Sasabe , Hiroaki Kotera , Toshihide Hane , Nobuyoshi Kihara , Masao Takebe
发明人： Kaoru Sasabe , Hiroaki Kotera , Toshihide Hane , Nobuyoshi Kihara , Masao Takebe
摘要： A device for use with a television receiver or the like, in which the time of receiving a telecast and the channel number of the telecast are preset, whereby the telecast of the preset channel can be automatically received at the preset time.
摘要翻译： 与电视接收机等一起使用的装置，其中预先接收电视广播的时间和电视节目的频道号码，从而可以在预设的时间自动地接收预设频道的电视节目。
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公开(公告)号：US5414568A
公开(公告)日：1995-05-09
申请号：US156941
申请日：1993-11-24
申请人： Hideshi Taki , Takafumi Ueno , Shiro Tsuji , Masataka Nikaido , Nobuyoshi Kihara
发明人： Hideshi Taki , Takafumi Ueno , Shiro Tsuji , Masataka Nikaido , Nobuyoshi Kihara
CPC分类号： G11B20/10 , G11B15/1875 , G11B20/10527 , G11B27/005 , G11B2220/90
摘要： A variable speed digital signal reproducing apparatus, particularly related to low speed reproduction of a digital signals recorded in a recording medium. The apparatus includes a unit for determining whether a reproduction PCM signal is renewed or not. Based on the renewal determination, PCM data of one frame is stored in a memory and the PCM data is read at a frequency rate corresponding to a tape reproducing speed at that time. Furthermore an interpolating device operates on the read PCM data to produce a PCM signal having the same frequency with which the PCM signal was read from the memory means.
摘要翻译： 一种变速数字信号再现装置，特别涉及记录在记录介质中的数字信号的低速再现。 该装置包括用于确定再现PCM信号是否被更新的单元。 基于更新确定，一帧的PCM数据被存储在存储器中，并且以与当时的磁带重放速度对应的频率速率读取PCM数据。 此外，内插装置对读取的PCM数据进行操作以产生具有与存储装置读取PCM信号相同频率的PCM信号。
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