Mitsubishi Electric

About: Mitsubishi Electric is a company organization based out in Ratingen, Germany. It is known for research contribution in the topics: Signal & Voltage. The organization has 23024 authors who have published 27591 publications receiving 255671 citations. The organization is also known as: Mitsubishi Electric Corporation & Mitsubishi Denki K.K..

Dc / dc power converter

Abstract: Disclosed is a DC/DC power converter wherein mean power consumption can be reduced over a wide range of DC voltage ratios. A control circuit (120) changes a switching frequency (f) at which IGBTs (S1-S4) are turned ON/OFF in accordance with a voltage ratio (k) on the basis of the following equations, so that the magnitude (ΔI) of the current ripple flowing in a reactor (Lc) is a prescribed fixed value irrespective of the voltage ratio (k) (k = V2 / V1) of the DC voltage conversion. When 1 ≦ k ＜ 2: f = (V1 / (2 × L × ΔI)) × (k - 1) × (2 - k) / k When k ＞ 2: f = (V1 / (2 × L × ΔI)) × (k - 2) / k

Moving image coding apparatus and moving image decoding apparatus

Abstract: A macro block size determining unit 1 determines the size of each macro block on a frame-by-frame basis. A macro block dividing unit 2 divides an inputted image into macro blocks each having the size determined by the macro block size determining unit 1. A macro block coding unit 3 determines a coding mode for each of the macro blocks divided by the macro block dividing unit 2, and codes pixel values in each of the macro blocks in the determined coding mode.

One-chip microcomputer with analog-to-digital converter

Abstract: An input circuit of a one-chip microcomputer is connected to an external switching circuit. When an analog input signal of a significant level generated in the external switching circuit is received at an analog input terminal of the input circuit, an A/D conversion start request signal is generated in an A/D conversion start request generating circuit and is sent to an A/D converter. The operation of the A/D converter is started in response to the A/D conversion start request signal, the analog input signal received at the analog input terminal is converted into digital data, and an A/D conversion finish signal is sent from the A/D converter to a CPU of the one-chip microcomputer. The operation of the CPU is started in response to the A/D conversion finish signal, and the digital data is readout to the CPU. Therefore, the A/D converter, the CPU or a clock is not operated to wait for an analog input signal generated in the external switching circuit, but the A/D converter is operated for the A/D conversion, and the CPU is operated to read out the digital data. Accordingly, an electric power consumed in the A/D converter, the CPU and the clock can be reduced.

A multi-level load balancing scheme for OR-parallel exhaustive search programs on the multi-PSI

Abstract: Good load balancing is the key to deriving maximal performance from multiprocessors. Several successful dynamic load balancing techniques on tightly-coupled multiprocessors have been developed. However, load balancing is more difficult on loosely-coupled multiprocessors because inter-processor communication overheads cost more. Dynamic load balancing techniques have been employed in a few programs on loosely-coupled multiprocessors, but they are tightly built into the particular programs and not much attention is paid to scalability. We have developed a dynamic load balancing scheme which is applicable to OR-parallel programs in general. Processors are grouped, and work loads of groups and processors are balanced hierarchically. Moreover, it is scalable to any number of processors because of this multi-level hierarchical structure. The scheme is tested for the all-solution exhaustive search Pentomino program on the mesh-connected loosely-coupled multiprocessor Multi-PSI, and speedups of 28.4 times with 32 processors and 50 times with 64 processors have been attained.

Thin film magnetic memory device executing self-reference type data read

Abstract: In one data read operation, data read for reading stored data before and after a predetermined data write magnetic field is applied to a selected memory cell, respectively, is executed, and the data read is executed in accordance with comparison of voltage levels corresponding to the data read operations before and after application of the predetermined data write magnetic field. In addition, data read operations before and after the application of a data write magnetic field are executed using read modify write. It is thereby possible to avoid an influence of an offset or the like resulting from manufacturing irregularities in respective circuits forming a data read path, to improve efficiency of the data read operation with accuracy and to execute a high rate data read operation.