Panasonic DVD-RV41 Operating Instructions Manual

Also see for DVDRV31 - DIG. VIDEO DISCPLAYE: Operating instructions Operating instructions Operating instructions Operating instructions Service manual

29ReferenceRQT5869I/P/BMPEG 2, the video compression standard adopted for use withDVD-Video, codes frames using these 3 picture types.I: Intra coded picture (I-picture)This is the standard picture and is a complete picture in itself.This means it has the best 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 or P-pictures.B: Bidirectionally-predictive coded picture (B-picture)This picture is calculated by comparing past and future I and P-pictures so it has the lowest volume of information.Linear PCM (pulse code modulation)PCM is the usual digital method used for music CDs. DVDs have agreater volume so they use linear PCM, which has a higher sam-pling rate. Compressed PCM signals are called packed PCM(PPCM).Optical digital audio cableElectronic signals are converted to optical signals for output to theamplifier. This reduces noise caused by electronic interference.Playback controlIf a Video CD has “playback control” written on it or its jacket, itmeans that particular scenes or information can be selected forviewing interactively with the television using the menu screen. Thisunit can play Video CDs with playback control.Using menus to control play of a Video CD is called “menu play” inthese operating instructions.Title/ChapterDVDs are divided up into large sections, titles, and smaller sections,chapters. The numbers allocated to these sections are called titlenumbers and chapter numbers.TrackVideo CDs and CDs are divided up into sections called tracks, andthe numbers allocated to these sections are called track numbers.BitstreamThis is the digital form of multiple channel audio data (e.g., 5.1 chan-nel) before it is decoded into its various channels.Dolby DigitalThis is a method of coding digital signals developed by Dolby Labo-ratories. Apart from stereo (2-channel) audio, these signals canalso be 5.1-channel audio. A large amount of audio information canbe recorded on one disc using this method.Dolby Pro LogicA surround system where a 4-channel audio track is recorded as2 channels and then is restored to 4 channels for play. The surroundchannel is monaural and can reproduce up to 7 kHz.DTS (Digital Theater Systems)This surround system is used in many movie theaters around theworld. There is good separation between the channels, so realisticsound effects are possible.Dynamic rangeDynamic range is the difference between the lowest level of soundthat can be heard above the noise of the equipment and the highestlevel of sound before distortion occurs.FieldOne frame is made up of 2 fields. A regular television shows thesefields one after the other to create frames.FrameFrames are the still pictures that go together to make a movingpicture. There are about 30 frames shown each second.Frame still and field stillA still is shown when you pause a moving picture. A frame still ismade up of 2 alternating fields, so the picture may appear blurred,but overall quality is high.A field still is not blurred, but it has only half the information of a framestill so picture quality is lower.Glossary

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