Digital-S
Encyclopedia
D-9 or Digital S as it was originally known, is a professional digital video
videocassette format created by JVC in 1995. It is a direct competitor to Digital Betacam. Its name was changed to D-9 in 1999 by the SMPTE. It is used mostly inside Europe and Asia, though has seen some use in the US, most notably by the FOX news channel.
formfactor, but the tape itself uses a much higher quality metal particle formulation. The recording system is digital and for video uses DV compression at a 50 Mbit/s bitrate
. Video is recorded in 4:2:2
component
format at a variety of standard definition resolutions, in either 4:3 or 16:9 aspect ratio
s. Audio is recorded as 16bit/48 kHz pcm with up to 4 separate channels.
developed an extension to D-9 called D-9 HD. D-9 HD uses twice the number of recording heads to record a 100Mbit/s video bitstream at resolutions of 720p60, 1080i60 and 1080p24. This variant is also able to record 8 channels of PCM audio at 16bit/48 kHz. This is ideal for mastering to AC3 or other multichannel audio compression
formats used for broadcasting. The higher data rate means that the recording time of any given tape is cut in half.
but lower than HDCAM SR; unfortunately, no objective tests have been done comparing these formats.
" format. DVCPRO achieves bitrate parity with D-9 and D-9 HD, but has a slower tape speed, making it less reliable. Some of the D-9 television studio
gear is capable of recording with Sel-Sync
or pre-read and is provided with 4 channel audio like digital betacam. Serial digital interface
s (SDI) are also provided. There is only one dockable recorder for docking to other cameras and that is the JVC BR-D40.
Digital video
Digital video is a type of digital recording system that works by using a digital rather than an analog video signal.The terms camera, video camera, and camcorder are used interchangeably in this article.- History :...
videocassette format created by JVC in 1995. It is a direct competitor to Digital Betacam. Its name was changed to D-9 in 1999 by the SMPTE. It is used mostly inside Europe and Asia, though has seen some use in the US, most notably by the FOX news channel.
Technical details
D-9 uses a tape shell of the VHSVHS
The Video Home System is a consumer-level analog recording videocassette standard developed by Victor Company of Japan ....
formfactor, but the tape itself uses a much higher quality metal particle formulation. The recording system is digital and for video uses DV compression at a 50 Mbit/s bitrate
Bitrate
In telecommunications and computing, bit rate is the number of bits that are conveyed or processed per unit of time....
. Video is recorded in 4:2:2
Chroma subsampling
Chroma subsampling is the practice of encoding images by implementing less resolution for chroma information than for luma information, taking advantage of the human visual system's lower acuity for color differences than for luminance....
component
Component video
Component video is a video signal that has been split into two or more component channels. In popular use, it refers to a type of component analog video information that is transmitted or stored as three separate signals...
format at a variety of standard definition resolutions, in either 4:3 or 16:9 aspect ratio
Aspect ratio
The aspect ratio of a shape is the ratio of its longer dimension to its shorter dimension. It may be applied to two characteristic dimensions of a three-dimensional shape, such as the ratio of the longest and shortest axis, or for symmetrical objects that are described by just two measurements,...
s. Audio is recorded as 16bit/48 kHz pcm with up to 4 separate channels.
HD recording
For High definition video recording, JVCJVC
, usually referred to as JVC, is a Japanese international consumer and professional electronics corporation based in Yokohama, Japan which was founded in 1927...
developed an extension to D-9 called D-9 HD. D-9 HD uses twice the number of recording heads to record a 100Mbit/s video bitstream at resolutions of 720p60, 1080i60 and 1080p24. This variant is also able to record 8 channels of PCM audio at 16bit/48 kHz. This is ideal for mastering to AC3 or other multichannel audio compression
Audio compression
Audio compression may refer to:*Audio compression , a type of lossy compression in which the amount of data in a recorded waveform is reduced for transmission with some loss of quality, used in CD and MP3 encoding, Internet radio, and the like...
formats used for broadcasting. The higher data rate means that the recording time of any given tape is cut in half.
Video quality
Video quality is generally very high; at standard definition resolutions, quality is higher than that of Betacam SP and comparable to Digital Betacam. At HDTV resolutions, based on specifications, quality is higher than HDCAMHDCAM
HDCAM, introduced in 1997, is an High-definition video digital recording videocassette version of Digital Betacam, using an 8-bit DCT compressed 3:1:1 recording, in 1080i-compatible downsampled resolution of 1440×1080, and adding 24p and 23.976 PsF modes to later models...
but lower than HDCAM SR; unfortunately, no objective tests have been done comparing these formats.
Additional information
Although D-9 uses the same video codec (DV) as MiniDV, the video bitrate of D-9 is significantly higher than that of the "prosumerProsumer
Prosumer is a portmanteau formed by contracting either the word professional or less often, producer with the word consumer. For example, a prosumer grade digital camera is a "cross" between consumer grade and professional grade...
" format. DVCPRO achieves bitrate parity with D-9 and D-9 HD, but has a slower tape speed, making it less reliable. Some of the D-9 television studio
Television studio
A television studio is an installation in which a video productions take place, either for the recording of live television to video tape, or for the acquisition of raw footage for post-production. The design of a studio is similar to, and derived from, movie studios, with a few amendments for the...
gear is capable of recording with Sel-Sync
Sel-Sync
Sel-Sync or Selective Synchronous recording is the process of selectively using some record heads as play back heads so that new signals can be recorded on other tracks in perfect sync with the existing tracks...
or pre-read and is provided with 4 channel audio like digital betacam. Serial digital interface
Serial Digital Interface
Serial digital interface is a family of video interfaces standardized by SMPTE. For example, ITU-R BT.656 and SMPTE 259M define digital video interfaces used for broadcast-grade video...
s (SDI) are also provided. There is only one dockable recorder for docking to other cameras and that is the JVC BR-D40.
External links
See also
- BetacamBetacamBetacam is family of half-inch professional videocassette products developed by Sony in 1982. In colloquial use, "Betacam" singly is often used to refer to a Betacam camcorder, a Betacam tape, a Betacam video recorder or the format itself....
- Digital Betacam
- HDCAMHDCAMHDCAM, introduced in 1997, is an High-definition video digital recording videocassette version of Digital Betacam, using an 8-bit DCT compressed 3:1:1 recording, in 1080i-compatible downsampled resolution of 1440×1080, and adding 24p and 23.976 PsF modes to later models...