Panasonic DVD-PV55 Operating Instructions Manual

Also see for DVD-PV55: Operating instructions Service manual Operating instructions

34VQT8645BitstreamThis is the digital form of multiple channelaudio data (e.g., 5.1 channel) before it isdecoded into its various channels.ChapterThis is the smallest division on DVDs and isroughly equivalent to a track.Dolby DigitalThis is a method of coding digital signalsdeveloped by Dolby Laboratories. The sig-nals are highly compressed, enabling alarge amount of information to be recordedon 1 disc.Dolby Pro LogicA surround system where a 4-channelaudio track is recorded as 2 channels andthen is restored to 4 channels for play. Thesurround channel is monaural and can re-produce up to 7 kHz.DTS (Digital Theater Systems)This is a method of coding digital signalsdeveloped by Digital Theater Systems. Thesignals are compressed at a low ratio tomaintain sound quality.Dynamic rangeDynamic range is the difference betweenthe lowest level of sound that can be heardabove the noise of the equipment and thehighest level of sound before distortionoccurs.FieldOne frame is made up of 2 fields.A regular television shows these fields oneafter the other to create frames.FrameFrames are the still pictures that go togeth-er to make a moving picture.There are about 30 frames shown eachsecond.Frame still and field stillA still is shown when you pause a movingpicture.A frame still is made up of 2 alternatingfields, so the picture may appear blurred,but overall quality is high.A field still is not blurred, but it has only halfthe information of a frame still so picturequality is lower.I/P/BMPEG 2, the video compression standardadopted for use with DVDs, codes framesusing these 3 picture types.I: Intra coded picture (I-picture)This is the standard picture and is a com-plete picture in itself. This means it has thebest picture quality and is the best to usewhen adjusting the picture.P: Predictive coded picture (P-picture)This picture is calculated based on past I orP-pictures.B: Bidirectionally-predictive coded picture(B-picture)This picture is calculated by comparingpast and future I and P-pictures so it hasthe lowest volume of information.Linear PCM (pulse code modulation)PCM is the usual digital method used formusic CDs. DVDs have a greater volumeso they use linear PCM, which has a highersampling rate.The compressed version of this is calledPacked PCM.Playback control (PBC)This method of controlling disc play is in-cluded on version 2.0 Video CDs. You areable to interact with the disc throughmenus.TitleThis is the largest division on DVDs.TrackThis is the smallest division on Video CDsand CDs and usually equates to a singlesong.Glossary