Hitachi, Ltd.

Hitachi Video Engineering, Incorporated

Hitachi Nuclear Engineering Co., Ltd.

Kenichi Fujiwara

Toshiyuki Kurita

Toshinori Murata

Fuminobu Takahashi

Masahiro Koike

Kazuhiro Kaizaki

Hajime Umehara

Masanori Kamiya

Yoshihiro Michiguchi

Sadao Kubota

Nobufumi Nakagaki

Yoshiaki Nagashima

Hiroshi Sekiya

Masao Sato

Ultrasonic waves from a transmit device are transmitted to an object subject to measurement. A surface reflected wave propagated in a contact medium and reflected at the surface of a tube and bottom surface reflected waves passing through an oxidation layer on the tube and reflected at the inner surface of the tube are convened into electric signals. A feature extracting part 5, in consideration of a correlation relationship of energy with respect to the frequency of a received signal, based on the received signal of ultrasonic waves converted to electric signals, extracts a signal feature data determined beforehand which has a strong correlation relationship with the thickness of a measured part. Based on the extracted signal feature data, a thickness conversion part references a relationship storage part which has stored therein beforehand a function that shows a relationship between the signal feature data and the thickness of the oxidation layer, and obtains the thickness of the oxidation layer.

Method and apparatus for measuring thickness of layer using acoustic

In a television receiver in which scanning for an incoming video signal is performed at a frequency n times as high as the input horizontal synchronous frequency by suitably controlling writing and reading on its video memory, the signals for writing and reading on the video memory unit are generated by a horizontal synchronization/deflection circuit. The horizontal synchronization/deflection circuit is arranged by having a clock generation/synchronous deflection circuit for generating reference signals to control the writing and reading on the video memory unit provided with a phase comparator such that a horizontal drive signal to drive a horizontal deflection circuit and a flyback pulse are brought in phase.

Television receiver with control of writing and reading of video memory

Growing community of inventors

Yokohama, Japan

Kenichi Fujiwara