Mr. Laurence J. Thorpe Profile

Laurence J. Thorpe

Senior Fellow at Canon USA Inc

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Publications (3)

Proceedings Article | 19 May 2015 Paper

New long-zoom lens for 4K super 35mm digital cameras

Laurence Thorpe, Fumiaki Usui, Ryuhei Kamata

Proceedings Volume 9463, 94630F (2015) https://doi.org/10.1117/12.2179695

KEYWORDS: Zoom lenses, Televisions, Cameras, Modulation transfer functions, Lens design, Glasses, Digital imaging, Digital cameras, Optical components, Ions

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Proceedings Article | 12 August 1992 Paper

All-digital 1.2-Gbit/s real-time HDTV VTR

Laurence Thorpe, T. Yoshinaka

Proceedings Volume 1656, (1992) https://doi.org/10.1117/12.135898

KEYWORDS: Video, Head, Analog electronics, Digital recording, Televisions, Metals, Standards development, Sensors, Image segmentation, Particles

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In 1984 the first real-time HDTV video tape recorder was introduced. The HDV-1000 was an analog VTR using one inch metal oxide tape and standard SMPTE open reels. It utilized basic Type-C recording principles although also incorporating a considerably higher FM carrier frequency, twice the deviation, and slightly more preemphasis, - all to achieve a 10 MHz baseband video recording bandwidth capability. Four such component analog recording channels were utilized in parallel to achieve a total recording capability of 40 MHz - made up of 20 MHz for the green video signal (or Luminance Y) and 10 MHz each for the red and blue signals (or R-Y and B-Y components in the case of Y, R-Y, B-Y recording). Almost 150 of these machines supported the early pioneering years of HDTV development - worldwide - over the period 1984 to the late 1980's. The HDTV video signal format to which this VTR was designed was based upon the preliminary 1 125/60/16:9/2: 1 system - having specified system bandwiths of 20 MHz for Luminance Y, and 7.0MHz R-Y, and 5.5 MHz B-Y. The HDV-1000 proved to be a remarkably robust, reliable HD VTR workhorse and it early and firmly established the viability of reliable RD real-time image capture. Nevertheless, it's technical shortcomings were soon exposed by a creative and demanding international program production community. The limitations of two channels of analog audio recording, and about four generations of liD video recording in post-production were inconsistent with the needs of high-end program production. The 45 db signal to noise limitation also imposed a boundary to the quality of the HDTV tape to 35 mm film transfers being made by both Electron Beam and Laser Recording techniques. The HDV-1000 had, however, pushed the state of the art in analog FM recording to the boundary. Head and tape technologies were not expected to advance sufficiently to warrant a new generation in analog recording design. Attention thus turned to digital recording techniques.

Proceedings Article | 1 November 1990 Paper

HDTV: overview of technologies and hardware

Laurence Thorpe

Proceedings Volume 1342, (1990) https://doi.org/10.1117/12.23169

KEYWORDS: Cameras, Airborne reconnaissance, Analog electronics, Televisions, Head, Video, Imaging systems, Standards development, Fermium, Frequency modulation

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Proceedings Volume Editor (1)

SPIE Conference Volume | 12 August 1992

High-Resolution Sensors and Hybrid Systems

Conference Committee Involvement (1)

High-Resolution Sensors and Hybrid Systems

10 February 1992 | San Jose, CA, United States

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