DVD recorder
Various devices have been developed to enable consumers to record video and/or audio programs for later presentation. Such devices include tape recorders, video cassette recorders, recordable compact discs, and most popularly, recordable digital video discs (DVD). A DVD recorder is utilized to record coded video and audio signals thereon. Digital video disks have become as popular as VCR tapes. A digital video disk (DVD) is a storage medium for storing image and audio information. The data stored in the digital video disk may be categorized into two types: presentation data and navigation data. The presentation data is compressed audio and video data. The navigation data is control information used to reproduce the presentation data. Of all kinds of optical disks, DVD that can store a large amount of information for computer, video images and music on the same recording medium has attracted our attention as a new large-capacity recording medium for PC and AV. The audio data recorded in a DVD-Video has a much higher quality than that in a CD since the audio data of the DVD has a higher sampling frequency and larger numbers of quantization bits and channels than that of the CD. Namely, the DVD player reproduces high quality audio data in multiple channels. A DVD recorder that records AV data onto a DVD-RAM according to MPEG allows a user to select whether to compress audio data. Once video is recorded onto a disc, a user may desire to change the speed at which the video is displayed. Most DVD recorders are designed to playback the video at different speeds. The popularization of playback-only DVD player and the appearance of DVD recorders that can also record DVD are rapidly expanding the DVD market.
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