Digital-S, later known as D-9, is a professional

digital Digital usually refers to something using discrete digits, often binary digits. Businesses *Digital bank, a form of financial institution *Digital Equipment Corporation (DEC) or Digital, a computer company *Digital Research (DR or DRI), a software ...

videocassette Videotape is magnetic tape used for storing video and usually sound in addition. Information stored can be in the form of either an analog or digital signal. Videotape is used in both video tape recorders (VTRs) and, more commonly, videocasset ...

format created by

JVC JVC (short for Japan Victor Company) is a Japanese brand owned by JVCKenwood. Founded in 1927 as the Victor Talking Machine Company of Japan and later as , the company was best known for introducing Japan's first televisions and for developin ...

in 1995. It is a direct competitor to

Sony is a Japanese multinational conglomerate (company), conglomerate headquartered at Sony City in Minato, Tokyo, Japan. The Sony Group encompasses various businesses, including Sony Corporation (electronics), Sony Semiconductor Solutions (i ...

Digital Betacam Betacam is a 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. ...

. Its name was changed to D-9 in 1999 by the

SMPTE The Society of Motion Picture and Television Engineers (SMPTE) (, rarely ), founded by Charles Francis Jenkins in 1916 as the Society of Motion Picture Engineers or SMPE, is a global professional association of engineers, technologists, and e ...

. It was used to a small extent in Europe and Asia and saw some use in the US, notably by the

Fox News Channel The Fox News Channel (FNC), commonly known as Fox News, is an American multinational conservative news and political commentary television channel and website based in New York City, U.S. It is owned by Fox News Media, which itself is ow ...

, but was a commercial failure compared with Digital Betacam. It was superseded by high-definition tapeless formats.

Technical details

The Digital-S 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 In telecommunications and computing, bit rate (bitrate or as a variable ''R'') is the number of bits that are conveyed or processed per unit of time. The bit rate is expressed in the unit bit per second (symbol: bit/s), often in conjunction ...

. Video is recorded in 4:2:2

component Component may refer to: In engineering, science, and technology Generic systems *System components, an entity with discrete structure, such as an assembly or software module, within a system considered at a particular level of analysis * Lumped e ...

format at a variety of

standard-definition Standard-definition television (SDTV; also standard definition or SD) is a television system that uses a resolution that is not considered to be either high-definition television, high or enhanced definition. ''Standard'' refers to offering a ...

resolutions, in either 4:3 or 16:9

aspect ratio The aspect ratio of a geometry, geometric shape is the ratio of its sizes in different dimensions. For example, the aspect ratio of a rectangle is the ratio of its longer side to its shorter side—the ratio of width to height, when the rectangl ...

s. Audio is recorded as 16-bit/48 kHz PCM with up to four separate channels. The tape is 1/2 inch wide, the helical scan head drum is 62 mm in diameter, and the video tracks, which are read by the video heads in the head drum, are 20 microns wide. Video quality is generally very high; at standard definition, D-9's quality is comparable with Digital Betacam. The BR-D51U model is additionally capable of analogue S-VHS playback.

HD recording

For high-definition video recording, JVC developed an extension to D-9 called D-9 HD, using twice the number of recording heads to record a 100 Mbit/s video bitstream at resolutions of 720p60, 1080i60 and 1080p24. This variant can also record 8 channels of

PCM Pulse-code modulation (PCM) is a method used to Digital signal (signal processing), digitally represent analog signals. It is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio application ...

audio at 16 bits and 48 kHz. The higher data rate and increased tape speed mean that the recording time of any given cassette would be halved. D-9 HD, based on specifications, would have been higher quality than Sony

HDCAM HDCAM is a high-definition video digital recording videocassette version of Digital Betacam introduced in 1997 that uses an 8-bit discrete cosine transform (DCT) compressed 3:1:1 recording, in 1080i-compatible down-sampled resolution of 144 ...

but lower than Sony HDCAM SR; no objective tests were made comparing these formats. It is not clear whether this proposed format was ever manufactured or sold.

Additional information

Although D-9 uses the same video codec as DV, the video bitrate of D-9 is significantly higher than that of the

prosumer A prosumer is an individual who both consumes and produces. The term is a portmanteau of the words '' producer'' and ''consumer''. Research has identified six types of prosumers: DIY prosumers, self-service prosumers, customizing prosumers, co ...

format.

DVCPRO DV (from ''Digital Video'') is a family of codecs and tape formats used for storing digital video, launched in 1995 by a consortium of video camera manufacturers led by Sony and Panasonic. It includes the recording or cassette formats DV, Mini ...

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 A television studio, also called a television production studio, is an installation room in which video productions take place, either for the production of live television and its recording onto video tape or other media such as SSDs, or for ...

gear is capable of recording with

Sel-Sync Sel-Sync or Selective Synchronous recording is the process of selectively using audio tape record heads as play back heads so that new signals can be recorded on other tracks in perfect sync with the existing tracks. Sel-sync recording dramaticall ...

or pre-read and is provided with four-channel audio like Digital Betacam.

Serial digital interface Serial digital interface (SDI) is a family of digital video Interface (computing), interfaces first standardized by SMPTE (The Society of Motion Picture and Television Engineers) in 1989. For example, ITU-R BT.656 and SMPTE 259M define digital ...

s (SDI) are also provided. A dockable recorder, the JVC BR-D40, attached to a variety of cameras, and there was a one-piece camcorder, the JVC DY-70U.

References

{{High definition media Video storage Videocassette formats Audiovisual introductions in 1995