Hidetoh Hata, Katsumi Haji, Kazushige Sako, Yoji Shibata, Masahiko Achiha: Digital video and audio file system. Nippon Telegraph Telephone Public, Hitachi, Craig and Antonelli, October 13, 1981: US04295154 (67 worldwide citation)

A digital video and audio file system is provided for use in systems such as a center-to-end video communication system. In the file system, video information, such as a color television video signal, is digitized in such a manner that it is separated into a luminance (Y) signal and a carrier chromi ...

Masahiko Achiha: Noise reducing system. Hitachi, Hitachi Denshi Kabushiki Kaisha, Craig and Antonelli, October 20, 1981: US04296436 (58 worldwide citation)

A noise reducer wherein, depending upon the magnitude of a difference signal between an input television signal at the present time and a television signal recorded in a frame memory and with noise reduced, the mixing ratio between the present-time input signal and the television signal obtained fro ...

Masahiko Achiha: Motion detecting circuit utilizing inter-frame difference signals of successive fields. Hitachi, Antonelli Terry & Wands, December 2, 1986: US04626891 (41 worldwide citation)

A motion detecting circuit suitable for detecting object-movement on an interlaced TV signal includes at least three field memories, subtracters, absolute circuits and an adder circuit. The motion detector evaluates object-movement by accumulating frame difference signals between adjacent fields.

Masahiko Achiha, Kazuo Ishikura: Color television signal processing circuit. Hitachi, Antonelli Terry & Wands, July 16, 1985: US04530004 (33 worldwide citation)

A color television signal processing circuit receives an input signal of a composite color television signal in the form of superimposition of a chrominance carrier signal on a luminance signal, separates the chrominance carrier signal and the luminance signal, and doubles the number of scanning lin ...

Masahiko Achiha, Kazuo Ishikura: Scanning line interpolation circuit for television signal. Hitachi, Antonelli Terry & Wands, January 13, 1987: US04636857 (25 worldwide citation)

A scanning line interpolation circuit for interpolating scanning lines of an interlaced television signal to thereby obtain a television signal having the doubled number of scanning lines, in which, in order to improve the quality of the reproduced television picture, the interpolation circuit is co ...

Masahiko Achiha, Isao Nakagawa, Kazuo Ishikura, Shobu Saito: Television signal processing circuit. Hitachi, Antonelli Terry & Wands, April 19, 1988: US04739390 (25 worldwide citation)

A television signal processing circuit which separates a television signal into a luminance signal and a chrominance signal or interpolates the scanning lines of the television signal by using a video memory such as a frame memory or a field memory. The circuit determines whether the television sign ...

Masato Sugiyama, Kenji Katsumata, Shigeru Hirahata, Isao Nakagawa, Sunao Suzuki, Masahiko Achiha, Kazuo Ishikura: Movement detection circuit of a video signal used in a television receiver. Hitachi, Hitachi Video Engineering, Antonelli Terry & Wands, December 27, 1988: US04794454 (19 worldwide citation)

A movement detection circuit for detecting movement information of a luminance signal and movement information of a chrominance signal of a television signal comprises a first movement detection circuit for detecting the movement information of the luminance signal and a second movement detection ci ...

Masahiko Achiha, Kazuo Ishikura, Shobu Saito, Masato Sugiyama, Kenji Katsumata: Movement detector for composite color television signals. Hitachi, Fay Sharpe Beall Fagan Minnich & McKee, March 7, 1989: US04811092 (18 worldwide citation)

A movement detector necessary for processing composite color television signals, which detects movement in image signals, wherein the detecting circuit is so constructed that no deficient motion is produced. A difference signal between the present frame and that preceding by two frames of the televi ...

Toshiyuki Sakamoto, Ikuya Arai, Toshiyuki Kurita, Toshinori Murata, Isao Nakagawa, Masahiko Achiha, Kazuo Ishikura: Detection circuit for detecting standard television signals and nonstandard television signals. Hitachi, Antonelli Terry & Wands, April 11, 1989: US04821112 (11 worldwide citation)

There is provided a detection circuit for TV receiver which includes a frame comb filter and a field comb filter and which generates a luminance signal or a chrominance signal by effecting addition or subtraction upon video signals of two frames adjoining each other included in the received TV signa ...

Isao Nakagawa, Masahiko Achiha, Masato Sugiyama, Kenji Katsumata, Toshinori Murata, Shigeru Hirahata, Akihide Okuda: Motion detector for chrominance signal in TV receiver. Hitachi, Antonelli Terry & Wands, April 5, 1988: US04736252 (10 worldwide citation)

A motion detector for a chrominance signal which is used with a TV receiver equipped with a video signal motion detector. This motion detector for a chrominance signal has a delay element for delaying the chrominance signal of a video signal by 1 frame period, a subtractor for subtracting the output ...