DVD code "v" for 007 subfield $e

[Weitz,Jay]

> On 2002 December 1, a new code "v" specifically for DVD format
> videorecordings was implemented for the Videorecording 007 field subfield
> $e (007/04).
> The new code "v" is to be used to identify all DVD videos.  DVDs use the
> digital PCM (Pulse Code Modulation) technique to represent video
> information on a grooveless, smooth, round plastic disc.  Most DVDs are 4
> ¾ inch in diameter, although some smaller 3 inch discs have also been
> commercially produced.  DVDs are usually identified by the term or
> trademark DVD, DVD VIDEO, or VIDEO CD (the standard compact disc logo with
> "DIGITAL VIDEO" below it).  DVDs have been commercially available only
> since 1996.
> A typical DVD will be coded and described as such:
> 007     v $b d $d c $e v $f a $g i $h z $i s
> 300     1 videodisc (99 min.) : $b sd., col. ; $c 4 3/4 in.
> 538     DVD, Dolby digital stereo.
> The existing Videorecording 007 subfield $e value "g," previously defined
> as "Laser optical (reflective) videodisc," has been redefined more
> narrowly as "Laserdisc."  Code "g" is now to be used only for videodiscs
> that use the analog PWM (Pulse Width Modulation) technique to represent
> video information on a grooveless, smooth, round plastic disc.  Laserdiscs
> exist in three standard commercially produced sizes:  12, 8, and 4 ¾ inch.
> The 12 inch discs are the most common, typically used for movies; they are
> usually identified by an LD trademark (with the phrase "LASER DISC" or
> "Laser Vision" below the LD trademark), LASER VIDEODISC, DiscoVision,
> LaserDisc, LaserVision, or similar phrase.  Much less common are the 8 and
> 4 ¾ inch discs, typically used for music videos or other short video
> programs; these are usually identified by the term or trademark CDV (CD
> VIDEO), VSD (VIDEO SINGLE DISC), or LD (LASER DISC).  These analog
> laserdiscs became commercially available in 1978, but production declined
> rapidly after 1998 because of the success of the DVD digital format.  The
> code "g" should no longer be used for DVDs.
> Jay Weitz
> OCLC WorldCat Content Management Division
>