 IVC-9000 VTR at DC Video[1] | |
| Media type | Magnetic Tape |
|---|---|
| Encoding | NTSC,PAL |
| Standard | Interlaced video |
| Developed by | International Video Corporation |
| Usage | Video production |
| Released | 1975 (1975) |
IVC 2-inch Helical scan was a high-end,broadcast quality helical scananalog recording format developed by theInternational Video Corporation (IVC) and introduced in 1975. Prior to this, IVC had produced several 1-inch (25 mm) helical scanvideo tape recorders (VTRs). Seeking to combine the image quality of the 2-inch (51 mm)magnetic tape used withquadruplex videotape systems, with the advantages ofhelical scan technology, the company developed theIVC-9000, a VTR for professional and broadcast applications.[2][3]
The Helical scanner used a tape wrap of 188.57 degrees around a drum of 3.170 inches in diameter, with two play/record heads. In the NTSC version of the format, it had 5 helical tracks (segments) per field and 6 in the PAL version, each with 57 lines per segment. The VTR was equipped with a colorvideo monitor, awaveform monitor scope, andvectorscope.[6][7]
The 9000 was one of the firstanalog video recorders utilized for electronic film production using analog high-resolution wideband video standards (such as the 655/48 standard mentioned previously), predating DI (digital intermediate) film production systems in use today.
The 9000-W-M was, for all intents and purposes, a custom pre-HDTV video system. The 655 line system was also used for 24 frame playback onTVs and monitors used onmovie studio sets. Thus the TVs had noflicker when shot on film, due to the different (and thus compatible to motion picture film's)frame rate. The 9000-W-M was used for someJAWS 3D's compositespecial effects.
The 9000, in its regular 525-line & 60-field-per-second NTSC configuration, was also used for mastering some of the firstlaserdiscs released byDiscovision in 1978 due to the format's high quality. However, Discovision abandoned the format a few years later in favor of1" Type C videotape, due to service & support for the 9000 machines becoming unavailable after IVC went out of business in the early 80s, and also due to the growing industry support for the newer 1" Type C format.
The picture quality was excellent, but unfortunately, the IVC-9000 did not have many sales (only 65 units were sold by IVC). Shortly after it came out, both the1" Type B and1" Type C formats of VTR came out. Both used less costly tape, and made just about as good of a picture.
IVC 800 series 1 Inch VTR was very popular. 800 series arereel-to-reel helical 'mid band' color portable TVR using 1 inch/25mm tape running at 17.2 cm per second/6.77 inches/second.
