Kabushiki Kaisha Toshiba

Nec Corporation

Yuichiro Yamaguchi

Takaki Nakamura

Takashi Higuchi

An electromagnetic flowmeter using a square wave excitation method includes a differential amplifier which outputs a detection signal; an analog-digital converter which converts the detection signal into a digital detection signal; a timing control circuit which generates a sampling signal for sampling the digital detection signal; an calculation unit which executes a flow rate calculation process and a abnormality judging process at a same time. The flow rate calculation process acquires a flow velocity output signal by sampling the digital detection signal in a flat portion in a positive/negative excitation section. The abnormality judging process acquires a differential output signal by sampling the digital detection signal in a rising/falling portion in the positive/negative excitation section, and obtains a differential noise from the flow velocity output signal and a differential output signal, and judges abnormality of the exciting current by comparing a differential noise with a detection threshold level.

Electromagnetic flowmeter and self-diagnosing method of exciting circuit unit thereof

A process of a pixel interpolation circuit is optimized for down-sizing of a circuit scale and improvement of process speed. The pixel interpolation method takes a pixel at a center of three row&times;three column image data as a target pixel subjecting interpolation process, and calculates color data of the target pixel and color data of pixels around the target pixel and adjacent thereto for outputting an interpolated color data for the target pixel. The pixel interpolation method includes a reading step of reading out image data of sequential first to third rows among image data of N rows&times;M columns written in a memory, per each column, wherein N and M are integer greater than and equal to three, and a color data determining step of determining the interpolated color data for the target pixel on the basis of a first color data as one of color data for three pixels of the column read out immediately before color data of the target pixel, second and third color data for two other pixels simultaneously read out with the target pixel, and a fourth color data as one of color data for three pixels of the columnw read out immediately after color data of the target pixel data.

Growing community of inventors

Tokyo, Japan

Yuichiro Yamaguchi