Panasonic DVD-RA61A Operating Instructions Manual

21RQT6043ReferenceGlossaryBitstreamThis is the digital form of multiple channel audio data (e.g., 5.1 channel)before it is decoded into its various channels.DecoderA decoder restores the coded audio signals on DVDs to normal. This iscalled decoding.Dolby DigitalThis is a method of coding digital signals developed by Dolby Laboratories.Apart from stereo (2-channel) audio, these signals can also be 5.1-channelaudio. A large amount of audio information can be recorded on one discusing 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 surround chan-nel is monaural and can reproduce up to 7 kHz.DTS (Digital Theater Systems)This surround system is used in many movie theaters around the world.There is good separation between the channels, so realistic sound effectsare possible.Dynamic rangeDynamic range is the difference between the lowest level of sound that canbe heard above the noise of the equipment and the highest level of soundbefore distortion occurs.Frame still and field stillFrames are the still pictures that go together to make a moving picture.There are about 30 frames shown each second.One frame is made up of two fields. A regular television shows these fieldsone after the other to create frames.A still is shown when you pause a moving picture. A frame still is made upof two alternating fields, so the picture may appear blurred, but overallquality is high.A field still is not blurred, but it has only half the information of a frame stillso picture quality is lower.I/P/BMPEG 2, the video compression standard adopted for use with DVD-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 use whenadjusting 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 a greatervolume so they use linear PCM, which has a higher sampling rate. Com-pressed PCM signals are called packed PCM (PPCM).Playback control (PBC)If a Video CD has playback control, you can select scenes and informationwith menus (called menu play in these instructions).Safety precautionsPlacementSet the unit up on an even surface away from direct sunlight, high tem-peratures, high humidity, and excessive vibration. These conditions candamage the cabinet and other components, thereby shortening the unit’sservice life.Do not place heavy items on the unit.VoltageDo not use high voltage power sources. This can overload the unit andcause a fire.Do not use a DC power source. Check the source carefully when settingthe unit up on a ship or other place where DC is used.AC mains lead protectionEnsure the AC mains lead is connected correctly and not damaged.Poor connection and lead damage can cause fire or electric shock. Do notpull, bend, or place heavy items on the lead.Grasp the plug firmly when unplugging the lead. Pulling the AC mainslead can cause electric shock.Do not handle the plug with wet hands. This can cause electric shock.Foreign matterDo not let metal objects fall inside the unit. This can cause electric shockor malfunction.Do not let liquids get into the unit. This can cause electric shock or mal-function. If this occurs, immediately disconnect the unit from the powersupply and contact your dealer.Do not spray insecticides onto or into the unit. They contain flammablegases which can ignite if sprayed into the unit.ServiceDo not attempt to repair this unit by yourself. If sound is interrupted, indi-cators fail to light, smoke appears, or any other problem that is not coveredin these instructions occurs, disconnect the AC mains lead and contactyour dealer or an authorized service center. Electric shock or damage tothe unit can occur if the unit is repaired, disassembled or reconstructed byunqualified persons.Extend operating life by disconnecting the unit from the power source if itis not to be used for a long time.MaintenanceTo clean this unit, wipe with a soft, dry cloth.≥Never use alcohol, paint thinner or benzine to clean this unit.≥Before using chemically treated cloth, read the instructions that camewith the cloth carefully.Do not place the unit onamplifiers or equipmentthat may become hot.The heat can damage the unit.

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