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Immediately after the launching of VCR in VHS Format by JVC for consumer use in 1976, NAC has also started to work on development of VCR in VHS Format for the first time under the licensing arrangement with JVC, and has succeeded in the development of a special type VCR in VHS Format in 1979 which is durable in the special severe environment required for the airborne use. NAC has worked on development of High Speed Video System by utilizing the technologies acquired from the development of VCR in VHS Format. NAC has then introduced in 1981 HSV—200 Sytem for the first time in Color as High Speed Video System. This HSV—200 SystemU is capable of recording at 200 fields per second with scanning lines of 262.5 lines per field based on the VHS (NTSC) Video Tape Standard. Since this has allowed to use the standard VHS video cassette, this System has provided the various merits; it has lowered its operation cost and the video cassette recorded by HSV—200 System has become possible to playback on the standard VCR of VHS Format for consumer use. This basic concept has been carried on all the subsequent models NAC developed to this date. Based on HSV—200 System, NAC has announced a serie of different models; FHS—200 specially designed for field use in 1982, HVRB—2002) designed for airborne purpose in 1983, and MHS—200 for use with a microscope in 1986. The recording speed of these models are all 200 fields per second and these models have been conveniently used for various applications in the new and different sectors of High Speed Video Instrumentation market. In 1987, a new feature of 400 fields per sçcond in half size was incorporated into HSV—200 System and a new model, HSV—4003) with field memory and various kinds of playback modes was announced. In 1990, HSV—l0004) System was introduced. This model is capable of recording at 500 fields per second in full size and at 1000 fields per second in half size. The VCR of HSV—l000 System has been adopted with new feature to handle S—VHS Format in addition to the current VHS Format and it has realized much higher resolution. The camera has also been improved by changing the imaging device from the current image pickup tube to the solidstate MOS Image Device and it has successfully reduced the lag practically to Zero of which resulted in a great improvement of Dynamic Resoluti on. In 1991, HSV—5005) System in S—VHS Format was developed, as the successor of HSV—400 System, based on the technologies cultivated at HSV—1000 System. HSV—500 System is capable of recording at speed of 250 fields per second in full size and 500 fields per second in half size in S—VHS/VHS Formats. HSV—500 and HSV—l000 Systems now have become the main product lines of NAC in the recent years. Followings are the major steps taken for the technological development of new features and functions of NAC High Speed Video Systems
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