Jump to content

D-1 (Sony)

From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by 202.180.106.168 (talk) at 09:08, 24 May 2012. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

D1
Sony DVR-2000 D1 VCR
Media typeMagnetic Tape
EncodingNTSC, PAL
Read mechanismHelical scan
Write mechanismHelical scan
StandardInterlaced video
Developed bySony
UsageVideo production
BTS D1 VTR DCR500

D-1 is an SMPTE digital recording video standard, introduced in 1986 through efforts by SMPTE engineering committees. It started as a Sony and Bosch - BTS product and was the first major professional digital video format. SMPTE standardized the format within ITU-R 601, also known as Rec. 601, which was derived from SMPTE 125M and EBU 3246-E standards.

Format

D-1 stores uncompressed digitized component video, encoded at Y'CbCr 4:2:2 using the CCIR 601 raster format with 8 bits, along with PCM audio tracks as well as timecode on a 3/4 inch (19 mm) Videocassette tape. Uncompressed component video used enormous bandwidth, 173 Mbit/sec (bit rate), for its time. The maximum record time on a D-1 tape is 94 minutes. The D-2 system soon followed, using composite video in order to lower the bandwidth needed.

D-1 resolution is 720 × 486 for NTSC systems and 720 × 576 for PAL systems; these resolutions come from Rec. 601 and are also used in DVD-Video and Standard-definition television. The D1 units are switchable between NTSC and PAL. Luma is sampled at 13.5 MHz and Chroma at 6.75 MHz with an overall data rate of 27 MHz. Sample at 13.5 MHz was used as it is a common multiple of NTSC/PAL line rate (6x 2.5 MHz). The first input\output interface was a 25 pin parallel cable (SMPTE 125M) and later updated to serial digital interface on coaxial cable (SDI, SMPTE 259M, 75Ω coax, 270 MHz). Ancillary data can be put in H/V blanking intervals. Color space for Y’ B’-Y’ R’-Y’ is also defined in ITU Rec. 601 or Rec. 709 color space.

Panasonic's D-5 format has similar specifications, but was introduced much later.

Use

D-1 was notoriously expensive and the equipment required very large infrastructure changes in facilities which upgraded to this digital recording format. Early D-1 operations were plagued with difficulties, though the format quickly stabilized and is still renowned for its superb standard definition image quality (Larcher, D. (2011). Digital Video Tape Recorder. Objects of Knowledge, of Art and of Friendship. A Small Technical Encyclopaedia. For Siegfried Zielinski. D. Lynk and N. Röller. Leipzig, Institut für Buchkunst: 30-31.)

Models

Sony

  • DVR-1000
  • DVR-2000
  • DVR-2100

BTS

  • DCR-100
  • DCR-300
  • DCR-500

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=D-1_(Sony)&oldid=494124327"