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..

Digital still cameras

Abstract: This paper presents an interpolation method for digital still cameras (DSCs) which is based on color signal correlation. The authors have developed a method of reducing aliasing by increasing the resolution of color signals in DSCs that use a single-plate charge coupled device (CCD) with a primary color filter array. The new method interpolates signals by taking advantage of the fact that color signal variations are similar to one another in a local region of an image. It selects the signal that shows the higher correlation, either in the horizontal or vertical directions, at color signal positions subject to interpolation, thus improving the color resolution. First, the effectiveness of the new method was verified using image simulation. Next, the prototype hardware was fabricated. The prototype is fitted with an original reduced instruction set computer (RISC) built-in dynamic random access memory (DRAM) for processing image signals to provide high-speed camera signal processing. The authors also confirmed that the effectiveness of the new method was also established in actual products.

Mode control of Ti-diffused LiNbO 3 slab optical waveguide

Abstract: The investigations were carried out on optical waveguides obtained by thermal diffusion of Ti into LiNbO3 single crystals. In the Ti-diffused LiNbO3 slab waveguides, the relationships of the refractive index profile (index change at the surface, diffusion depth) to various diffusion conditions were examined. Conditions were found to fabricate the waveguides of the required number of modes (TE modes) and effective indices for the wavelength of a He–Ne laser (0.6328 μm) and a GaAs–GaAIAs double heterostructure laser (DH laser) (0.8730 μm). The slab waveguides of the required number of modes and effective indices could be obtained by adjusting only the thickness of evaporated Ti film.

Rotary electric machine

Abstract: A stator coil accommodated in a slot of a rotary electric machine includes a coil conductor, a main insulating layer, a low resistance corona shield layer, and a stator coil extending outside the slot is provided with a first stator coil at the end of the low resistance corona shield layer has a first nonlinear resistance layer and a second nonlinear resistance layer partially overlapping with an end of the first nonlinear resistance layer, and a lower limit value of an electric resistivity of the second nonlinear resistance layer in a predetermined electric field is larger than an upper limit value of an electric resistivity of the first nonlinear resistance layer by one order of magnitude or more.

Heat pump device, heat pump system, and method for controlling three-phase inverter

Abstract: A selection unit switches between a phase θp and a phase θn different from the phase θp substantially by 180 degrees, and outputs one of them in synchronization with a carrier signal. A voltage-command generation unit generates and outputs three-phase voltage command values Vu*, Vv* and Vw* based on the phase outputted by the selection unit. A PWM-signal generation unit generates three-phase voltage command values Vu*′, Vv*′ and Vw*′ by correcting the three-phase voltage command values Vu*, Vv* and Vw* outputted by the voltage-command generation unit according to a predetermined method, and generates six drive signals corresponding to switching elements of the inverter based on the three-phase voltage command values Vu*′, Vv*′ and Vw*′ and the carrier signal. The PWM-signal generation unit outputs the generated drive signals to the corresponding switching elements of the three-phase inverter, to cause the inverter to generate a high-frequency AC voltage.

Vector controller for permanent-magnet synchronous electric motor

Abstract: A method of controlling a current command by comparing voltage with a set value needs to vary the set value depending on voltage fluctuation, which involves taking a complicated control. A vector controller for a permanent-magnet synchronous electric motor, according to the present invention, can realize with a simplified configuration a field-weakening operation in a one-pulse mode in a high speed range by providing a current command compensator that corrects a current command by a corrected current command calculated based on a modulation index.