Digital Video. A format initially used by SONY™ for the output of a digital camera or VCR. The DV format uses a special communication protocol: IEEE1394 (a.k.a. Firewire, iLink). The format is basically a digital component video format (YUV). In PAL it is based on 50 fields/sec and 625 lines per frame and the encoding system is 4:2:0. In NTSC there are 60 fields/sec and 525 lines and the encoding system is 4:1:1. These field and line rates are similar to those used in the analog formats. The audio part of the DV format is digitally encoded but uncompressed, with sampling rates that can be selected by the user: 44.1 kHz @16bits for two sound channels (similar to an audio CD) or @ 12 bit and 32 kHz sampling rate, for four audio channels. The compression rate is about 5:1 and this standard provides a 25Mbit/sec data rate. Every compressed frame is fed in parallel to ten channels during recording (NTSC) or to 12 channels (PAL), therefore, dropout effects become almost obsolete. There are two cassette sizes for this format: a mini cassette for up to 60 minutes of recording and a regular cassette for up to 240 minutes of recording.
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