Abstract: A display system which uses one display unit as if it were a plurality of display units to separately display whole information and partial information of document is disclosed. A plurality of display windows are defined on one display screen and a layout or a reduced image of the whole information is displayed in one of the window and information or image representing the information of a partial area of the whole information is displayed in other window. When one of the whole information and the partial area information is changed, the other information is also changed correspondingly, or a mark indicating a relation between the whole information and the partial area information is displayed in one of the window.

Abstract: In order to utilize memo data written by hand for purposes of retrieving a document, the original document image data is stored and, thereafter, a document image data with memo is separately input, the document image data with memo being comprised of the original document image onto which is additionally written memo data by hand. The position of the document image data with memo is then brought into alignment with the original document image data and is correlated to extract only that memo data which has been written by hand. Then the kind of memo is discriminated, the process is effected depending upon the kind of memo, and the memo data is stored in a secondary data file for retrieval. To retrieve the document, the memo data of a plurality of documents is read out from the secondary data file depending upon the kind of memo that is designated, and is displayed as a look-up table.

Abstract: In a tape cassette, which comprises a cassette casing which consists of upper and lower halves which are molded by injection molding from a synthetic resin, reels mounted for rotation in the cassette casing and having at least lower flanges, and a groove formed in an outer surface of a bottom wall of the lower half in a region which is adjacent the lower flanges of the reels, an improvement comprises at least a projection being formed on at least a portion of an inner surface of the bottom wall of the lower half which overlies the guide groove so as to facilitate a flow of a molten resin injection near the guide groove during molding of the lower half.

Abstract: A direct memory access control circuit equipped with a first register for storing the top address of a memory area, a second register for storing the bottom address of that memory area, a comparison circuit for comparing the current address used for memory access with the bottom address stored in the second register, and a control circuit for replacing the current address, which is to be subsequently used for memory access, with the top address stored in the first register when coincidence is detected by the comparison circuit.

Abstract: Method of and apparatus for converting a first two-dimensional image on first column direction and row direction scales to a second two-dimensional image on second column direction and row direction scales at a high speed, in which use is made of the periodicity of the positional relation between the image elements of the first image arranged in matrix and having various data values and the image elements of the second image arranged in matrix and having various data values to determine, for each one of the second image elements, four second image elements lying on the intersections between two adjacent rows and two adjacent columns in the first image element matrix which rows and columns surround the second image element and constitute a reference from for the second image element, and in which the data value for each second image element is calculated on the basis of the data values of the four first image elements associated with the first image element and the vertical and horizontal coordinates within th

Abstract: In a method for controlling an image display apparatus having a file management table for managing information including titles of image data stored in a file memory and storage addresses therefor and a window management table for managing information including locations and sizes of windows on a display screen and quarry locations of the image data, the content of the window management table in accordance with an input command is updated so that the location and size of the window, the superposition of the windows and the scrolling of the window can be interactively changed.

Abstract: A memory control unit for a computer has the function of extracting or synthesizing only a necessary portion from or to two-dimensional image scan data, in addition to a conventional main memory function. It comprises an address controller for calculating an address of data to be transferred based on source and destination start addresses A.sub.1 and A.sub.2 of the two-dimensional image scan data, a lateral length W.sub.1 and a longitudinal length of the necessary portion, and lengths I.sub.1 and I.sub.2 of unnecessary portion, and a controller for controlling memory read/write operation.

Abstract: A novel tape cassette which has tape guides that prevent the tape from moving upwardly or downwardly in the cassette and which are constructed by providing interleafed guides which are formed by molding from opposite sides of the top and lower half of the cassette during construction. It has been discovered that the tape guides molded in plastic cassettes tend to incline or tilt away from the front edge of the cassette which result in the tape moving upward or downwardly as it engages such inclined tape guides. The present invention provides for forming a portion of the guides from the upper half of the cassette and other portions of the guides formed from the lower cassette half such that the combination of the upper and lower guides interleaf and result in the tape being maintained in the desired center relationship while traveling in either direction.

Abstract: A novel tape cassette which has tape guides that prevent the tape from moving upwardly or downwardly in the cassette and which are constructed by providing interleafed guides which are formed by molding from opposite sides of the top and lower half of the cassette during construction. It has been discovered that the tape guides molded in plastic cassettes tend to incline or tilt away from the front edge of the cassette which result in the tape moving upward or downwardly as it engages such inclined tape guides. The present invention provides for forming a portion of the guides from the upper half of the cassette and other portions of the guides formed from the lower cassette half such that the combination of the upper and lower guides interleaf and result in the tape being maintained in the desired center relationship while traveling in either direction.

Abstract: A tape cassette having two substantially coplanar reels with tape wound on at least one of the reels and extending along a defined path within the cassette housing to the other reel, the ends of the tape being attached to the respective reels. The path is at least partly defined by guide means comprising a guide member to control the location of one edge of the tape very accurately. The guide member has at least one surface portion with a conical configuration, and the tape makes contact with this conical portion around only a limited arc. The axis of the conical portion of the guide member is substantially parallel to the axis of the adjacent roller, and the included conical angle defined by the conical surface is very small. The guide member has a shoulder that extends substantially perpendicularly outwardly from the conical axis at the constricted end of the conical surface to serve as a guide surface for one edge of the tape.