中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

5 records (took 0.015 seconds)

    SYSTEM FOR DISTRIBUTED POWER MANAGEMENT IN PORTABLE COMPUTERS
    1.
    发明专利
    SYSTEM FOR DISTRIBUTED POWER MANAGEMENT IN PORTABLE COMPUTERS 未知

    公开(公告)号：CA2087767C

    公开(公告)日：1998-05-05

    申请号：CA2087767

    申请日：1993-01-21

    Applicant: IBM

    Inventor： LEE NATHAN J ,  NOVAK FRANK P ,  LEONTIADES KYRIAKOS ,  KANNAN KRISHNAMURTHI ,  SHARMA VIKRAM ,  JONES CHRISTOPHER D

    IPC: G06F1/26 ,  G06F1/28 ,  G06F1/30 ,  G06F1/32 ,  G06F9/30

    Abstract: The present invention provides a system and method for managing power in a portable, pen-based notebook computer. The system and method provides a means for minimizing power consumption by collecting and interpreting power related data at various processing elements while hiding many of the details from the end-user. The present invention is a system and method for monitoring, collecting and acting upon power-related data in portable computer to maximize the amount of time the portable computer can be used between battery re-charging with minimal user intervention. The present invention is comprised of a plurality of independently controllable power planes which are selectively powered so that the portable computer consumes the minimum power necessary to perform a particular function and a plurality of central processing units (CPUs) operating asynchronously with respect to each other. The present invention is further comprised of an on/off glue logic means for monitoring battery condition, user invoked functions, and system state and a power management means for controlling the operation of each of the CPUs as a function of the conditions sensed by the sensing means.

    IR PULSE MODEM NRZI
    4.
    发明专利
    IR PULSE MODEM NRZI 未知

    公开(公告)号：PL179089B1

    公开(公告)日：2000-07-31

    申请号：PL31912595

    申请日：1995-09-15

    Applicant: IBM

    Inventor： BALASUBRAMANIAN PERUVEMBA S ,  LEE NATHAN J ,  LEKUCH SCOTT D

    IPC: H04L7/00 ,  H04L25/49 ,  H03M5/06 ,  H04B10/12

    Abstract: A modulation scheme and system, compatible with both the asynchronous IRDA mode and the synchronous mode of IR communication, involves Non-Return-to-Zero-Inverted (NRZI) and Flash pulse encoding in conjunction with zero-bit stuffing. A digital data stream has a zero-bit inserted therein, before NRZI format encoding, whenever five consecutive one's are detected in the stream to enable the controller to distinguish the data from flags, which are exempt from the zero-bit insertion, and to provide enough transitions in the data so that the demodulator's digital phase lock loop can stay locked independent of the data contents. A Flash pulse (of from +E,fra 3/16+EE to +E,fra 8/16+EE of bit cell width, depending on the data rate) is generated whenever a transition is detected in the NRZI formatted data. The result, in keeping with IRDA modulation, is that a Flash pulse is generated whenever a zero occurs in the data stream. On the demodulation side, whenever a Flash pulse is received, the level of the receive line is toggled resulting in an output in NRZI format. Using this modulation scheme with a serial controller which supports NRZI and bit-stuffing, a system may be constructed that uses the controller's phase lock loop to send and receive data synchronously.

Patent Agency Ranking