International Business Machines Corporation

Kohji Kawahara

Takashi Sugawara

Tsuyoshi Miyamura

Tomoki Maruichi

Yuji Chotoku

A motion detection apparatus includes an acceleration sensor which detects acceleration generated by motion of an electronic device; a motion detecting section including a statistical processing section which calculates the average value of data provided from the acceleration sensor, calculates the difference between the average value and the last value of the data obtained, and calculates a pseudo-variance value of the data from the calculated difference; a threshold comparing section which compares the pseudo-variance value calculated by the motion detecting section with a motion threshold to generate a signal value in response to determination that the pseudo-variance value has exceeded the motion threshold; a first buffer memory which sequentially stores signal values generated by the threshold comparing section at predetermined time intervals; and a signal generating section which includes means for adding up values in the first buffer memory, thereby appropriately associating with motion.

Motion detection apparatus and motion detecting method

A method to reduce the power dissipation of a system by omitting an unnecessary CPU throttling operation in a power management apparatus that performs the CPU throttling operation. A power management apparatus is constituted by an event detecting section to detect an event in a system, an activity detecting section to decide whether the system is in a busy state or in an idle state by checking whether or not there is activity in the system, and a clock control section to execute CPU-clock control. The control section does not perform an unnecessary CPU throttling operation, by stopping the CPU throttling operation when the system is in the idle state and performing the CPU throttling operation only when the system is in the busy state. With this, the power dissipation of the system can be considerably reduced.

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Tokyo, Japan

Kohji Kawahara