POWER-SUPPLY DEVICE FOR PORTABLE COMPUTER

    公开(公告)号:JPH07245944A

    公开(公告)日:1995-09-19

    申请号:JP31421992

    申请日:1992-10-30

    Applicant: APPLE COMPUTER

    Abstract: PURPOSE: To enhance the output efficiency for a load variable over a wide range by compensating for the fluctuation of load current through regulation of the duty cycle of a square wave generator and turning the square wave generator off completely over a significantly large part of the operating time of a power supply when the current demand level is low. CONSTITUTION: Upon receiving an output signal from a programmable reference generator 45 and an operation mode signal from a controller 50, a switching regulator 15 outputs a square wave to the primary coil 22 of a transformer 20 which produces a DC output voltage through the secondary coil thereof. In full-on constant voltage mode, a constant voltage output is sustained by varying the duty cycle of the square wave continuously with a feedback signal generated from a reference voltage generator 45. The controller 50 monitors the load demand level and when it drops below a specified level, a transition signal to burst mode is delivered and the switching regulator 15 is paused except the charging interval of capacitors 61, 63.

    EQUIPMENT AND METHOD FOR DISPLAYING GRAPHICAL IMAGE

    公开(公告)号:JPH06309466A

    公开(公告)日:1994-11-04

    申请号:JP13384093

    申请日:1993-05-12

    Applicant: APPLE COMPUTER

    Inventor: KIYARII KURAAKU

    Abstract: PURPOSE: To obtain the device and method for effectively generating and operating a graphical image to be displayed on an output device of a computer. CONSTITUTION: All graphical images are maintained as single base geometry on which every possible geometric operation is imposed. Simplified geometry is called a shape and shapes are put together to obtain an object called a picture. Geometric operation is done at any time for geometry in a local space and those operation results are drawn whatever display device is used in a layer for a hierarchical output method. A cache is maintained for geometry calculation, so the calculation needs to be done only once irrelevantly to the resolution of an output display and geometric information is never lost as a result of a bit map process.

    RECOGNIZING METHOD OF PATTERN GROUP FROM CONTINUOUS PATTERN AND PATTERN RECOGNIZING DEVICE

    公开(公告)号:JPH06266900A

    公开(公告)日:1994-09-22

    申请号:JP13757592

    申请日:1992-05-01

    Applicant: APPLE COMPUTER

    Abstract: PURPOSE: To correctly recognize a character space, to correct it and to output an array. CONSTITUTION: This device stores every input character, compares a last entry in each buffer (memory 16) with a known word dictionary, copies a last entry which coincides with a word to a new buffer, places space after the last entry in an old buffer, and eliminates buffer content when a last entry from the buffer does not coincide with the beginning of a known word in a dictionary. The device decides the position to place space between words by repeating operation until all content of every buffer is eliminated or until carriage return or a character like a period is stored in each buffer, recomparing a last entry from each buffer with the dictionary, eliminating an optional buffer which has a last entry that does not belong to words in the dictionary or that does not end with space followed by an end character, and executing at least either keeping or output of the remaining words.

    SYSTEM AND METHOD FOR DISPLAY OF INTEGRATED VIDEO AND GRAPHIC

    公开(公告)号:JPH06214538A

    公开(公告)日:1994-08-05

    申请号:JP10691393

    申请日:1993-05-07

    Applicant: APPLE COMPUTER

    Abstract: PURPOSE: To provide a computer system for providing an integrated video and graphic display including two individual buffers, i.e., one for video and the other for graphics. CONSTITUTION: Video data stored in the video buffer 40A and graphic data stored in the graphic buffer 40B may be different in the pixel depths. The data are transferred from the video buffer 40A to a video-processing path, and the graphic data are transferred to a graphic-processing path. The data may be transferred from the buffers at different speeds, so that the pixel transfer speeds along the processing paths are equal to each other. Pixels from the respective processing paths may be combined to generate integrated pixels for video and graphic displays.

    40.
    发明专利
    失效

    公开(公告)号:JPH05298454A

    公开(公告)日:1993-11-12

    申请号:JP35535792

    申请日:1992-12-21

    Applicant: APPLE COMPUTER

    Abstract: PURPOSE: To reduce the size of a display memory required for a computer system capable of making color display. CONSTITUTION: A device 16 which converts the display of color pixels of a 24-bit color format into the display of a 15-bit color format is provided with individual circuits for data indicating each component of colors and each circuit is incorporated with a device which selectively increases the values of the five highest-order bits of a value indicating each component of the colors, a device which makes the device that selectively increases the five highest-order bits generate a signal, and a device which selectively enables a device to respond to the value of the lowest-order bit in accordance with the target pattern of the pixels.

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