中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

4 records (took 0.009 seconds)

    File access system
    2.
    发明授权
    File access system 失效
    文件访问系统

    公开(公告)号：US3668647A

    公开(公告)日：1972-06-06

    申请号：US3668647D

    申请日：1970-06-12

    Applicant: IBM

    Inventor： EVANGELISTI CARLO J ,  RITTENHOUSE LARRY E

    IPC: G06F17/30 ,  G11B20/12 ,  G11B27/10 ,  G11B27/11 ,  G11B27/32 ,  G06F15/40

    CPC classification number: G06F17/30949 ,  G11B20/1252 ,  G11B27/105 ,  G11B27/11 ,  G11B27/329 ,  G11B2020/10916 ,  G11B2220/20 ,  G11B2220/65 ,  Y10S707/99931

    Abstract: A system is shown wherein, provided with an appropriate file organization, a data file can be read from a disk master file, given the file name, by performing one seek and one read operation. The system employs hash coding to compress a data file name to a disk file address. The disk file is positioned into fixed length blocks where each hashed file address points to a block, the block being as large as one cylinder or as small as one sector. Each block is organized such that it includes a directory for the files contained in the block and also contains the data files. Each entry in the directory contains the data file name and the address of that data file in the block. The process of locating and reading a data file entails the hash coding of a file name to yield a block address, the moving of the read head to the disk area having the block address and the reading of the directory and the remainder of the block to read out the data file. In the directory reading, the data file names are compared in real time, as they are read from the disk, with the name of the desired data file. When a name match occurs, the address of the data file in the block and the address of the next file address are read and stored. As the disk rotates, the desired data file address just read is constantly compared with the active disk address. When a match occurs, the file has been located and is read out. The reading is terminated at the address of the beginning of the next file. If the file name is not found in the directory of the block indicated by the hash coding of the file''s name, then the file is not present therein.

    Abstract translation: 显示了一种系统，其中提供有适当的文件组织，可以通过执行一个查找和一个读取操作，从给定文件名的磁盘主文件中读取数据文件。 系统采用哈希编码将数据文件名压缩为磁盘文件地址。 磁盘文件位于固定长度的块中，其中每个散列文件地址指向一个块，该块与一个柱面一样大，或者小至一个扇区。 每个块被组织，使得它包括用于包含在块中的文件的目录，并且还包含数据文件。 目录中的每个条目都包含数据文件名和块中该数据文件的地址。 定位和读取数据文件的过程需要文件名的哈希编码以产生块地址，将读头移动到具有块地址的磁盘区和将目录的剩余部分读取到 读出数据文件。 在目录读取中，数据文件名称被实时比较，因为它们是从磁盘读取的，具有所需数据文件的名称。 当发生名称匹配时，读取并存储块中数据文件的地址和下一个文件地址的地址。 当磁盘旋转时，刚刚读取的所需数据文件地址与活动磁盘地址不断进行比较。 当匹配发生时，文件已被找到并被读出。 读取结束于下一个文件开头的地址。 如果在由文件名的散列编码表示的块的目录中找不到文件名，则该文件不在其中。

    Scan converter multiplexing system
    3.
    发明授权
    Scan converter multiplexing system 失效
    扫描转换器多路复用系统

    公开(公告)号：US3705263A

    公开(公告)日：1972-12-05

    申请号：US3705263D

    申请日：1971-06-30

    Applicant: IBM

    Inventor： RITTENHOUSE LARRY E

    IPC: H04N7/01 ,  H04N7/08 ,  H04N5/02

    CPC classification number: H04N7/0105 ,  H04N7/01 ,  H04N7/0806

    Abstract: In the disclosed system, the storage screen of a scan converter or a recording storage tube is divided into a plurality of image areas such as four quadrants, for example. In each of these quadrants, there are written on the screen respective different images which are destined for four terminals. The storage screen is then read by having the reading beam therein sweep the total width of the storage screen in a raster scan. A spatial multiplexing arrangement is provided to transmit to each of the terminals the respective images to be received thereby. In this system, therefore, there is enabled the efficient use of a recording storage tube since its employment can be shared by a plurality of terminals. In an embodiment of the invention, the sync signals for the reading beam in the recording storage tube and those for the terminals can be so arranged whereby two raster lines are provided for each terminal for one raster line in the recording storage tube. Where a non-interlaced scan is employed in the terminals, then two fields are utilized per frame. However, where an interlaced scan is provided in the terminals, then four fields are utilized per frame.

    Abstract translation: 在所公开的系统中，扫描转换器或记录存储管的存储屏幕例如被划分为多个图像区域，例如四个象限。 在这些象限的每一个中，在屏幕上写有各自针对四个终端的不同图像。 然后通过使读取光束在光栅扫描中扫描存储屏幕的总宽度来读取存储屏幕。 提供空间复用装置以向每个终端发送要由其接收的各个图像。 因此，在该系统中，能够有效地使用记录存储管，因为其使用可由多个终端共享。 在本发明的一个实施例中，记录存储管中的读取光束和用于端子的读取光束的同步信号可以这样布置，从而为记录存储管中的一条光栅线的每个端子提供两条光栅线。 在端子采用非隔行扫描的情况下，每帧使用两个场。 然而，在端子中提供隔行扫描的情况下，每帧使用四个场。

Patent Agency Ranking