Development of a 1-inch analog Hi-Vision VTR

A 1-inch analog high-vision VTR

Fig.1 A 1-inch analog high-vision VTR

Full-scale research on “Hi-Vision” (or HDTV) systems was started by NHK’s Science and Technology Research Laboratories in 1970. In parallel with system investigation, development of related devices, starting with television cameras and video-tape recorders (VTRs), has continued. Moreover, a prototype of the world’ first “Hi-Vision” VTR appeared in 1981.

To record Hi-Vision signals (which require four times the information capacity of standard TV data), new broadband and high-density recording technologies—such as a broadband “Sendust” alloy multi-layer head, two-channel (luminance and color signal) recording, designs for efficient FM recording systems, and a new FM-waveform-equalization—were developed, and recording densities were doubled compared to conventional ones, accordingly.

In the lead up to developing a practicalmachine, this prototype was applied for producing Hi-Vision programs, and it contributed to the popularization of Hi-Vision TV through public exhibitions of programs.

The broadband and high-density recording technologies that resulted from this research and development became widely applied to later VTR development. The specification of the “1-inch analog high-vision VTR” for showing at world science expositions in 1984 was determined on the basis of the VTR that was consequently developed.

Leading the research and development on design methods for efficient FM recording systems, Kouji Kamijo of NHK was awarded the “Academic Promotion Award” from the Institute of Electronics, Information and Communication Engineers in 1982.

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