Hitachi DV-RX5000U manual Glossary, Disc handling, Reference

Reference

\Glossary

Bitstream

This is the digital form of multi-channel audio data (e.g., 5.1 chan- nel) before it is decoded into its various channels.

CPRM (Content Protection for Recordable Media)

CPRM is the copyright protection technology that is used to protect broadcasts that are allowed to be recorded only once (e.g. some CATV broadcasts).

Decoder

A decoder restores the coded audio signals on DVDs to normal. This is called decoding.

Dolby Digital

This is a method of coding digital signals developed by Dolby Labo- ratories. Apart from stereo (2-channel) audio, these signals can also be multi-channel audio. A large amount of audio information can be recorded on one disc using this method.

This unit is set to record using Dolby Digital in all recording modes.

Dolby Pro Logic

A surround system where a 4-channel audio track is recorded as 2 channels and then is restored to 4 channels for play. The surround channel 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 effects are possible.

Film and video

DVD-Videos are recorded using either film or video. Usually, film is recorded at 24 frames per second, the rate movies are filmed at, while video is recorded at 30 frames per second.

Frame still and field still

Frames are the still pictures that go together to make a moving pic- ture. There are about 30 frames shown each second.

One frame is made up of two fields. A regular television shows these fields one after the other to create frames.

A still is shown when you pause a moving picture. A frame still is made up of two 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 frame still so picture quality is lower.

Disc handling

Do not use irregularly shaped discs, such as heart-shaped. (These can damage the unit.)

∫How to hold a disc

Do not touch the recorded surface.

∫If there is dirt or condensation on the disc

Moisture may condense on discs after they are brought inside from the cold.

DVD-RAM and DVD-R

Use a generally available DVD disc cleaner to clean DVD-RAM and DVD-R discs: Do not use cleaners or cloths for CDs.

Interlace and progressive output

NTSC, the video signal standard, has 480 interlaced (i) scan lines, whereas progressive scanning uses twice the number of scan lines. This is called 480p. The video signals output from this unit’s COM- PONENT VIDEO OUT terminals (Y, PB, PR) allow you to enjoy higher quality pictures than if the signals were output from the VIDEO OUT terminal or S-VIDEO OUT terminal.

I/P/B

MPEG 2, the video compression standard adopted for use with DVD-Video, codes frames using these 3 picture types.

I:Intra coded picture

This picture has the best quality and is the best to use when adjusting the picture.

P:Predictive coded picture

This picture is calculated based on past I- or P-pictures.

B:Bidirectionally-predictive coded 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)

These are uncompressed digital signals. This unit outputs linear PCM sound in 2 channels from the DIGITAL AUDIO OUT terminals.

Playback control (PBC)

If a Video CD has playback control, you can select scenes and infor- mation with menus.

Pan&Scan/Letterbox

In general, DVD-Video are produced with the intention that they be viewed on a widescreen television with an aspect ratio of 16:9. This means you can view most material with the intended aspect ratio on a widescreen television.

Material with this ratio will not fit onto a standard television with an aspect ratio of 4:3. Two styles of picture, “Pan&Scan” and “Letter- box”, deal with this problem.

Pan&Scan: The sides are cut off so the picture fills the screen.

Letterbox: Black bands appear at the top and bottom of the picture so the picture itself appears in an aspect ratio of 16:9.

DVD-Video, Video CD, CD

Wipe with a damp cloth and then wipe dry.

∫Handling precautions

≥Do not write on the label side with a ball-point pen or other writing instrument.

≥Do not use record cleaning sprays, benzine, thinner, static electric- ity prevention liquids or any other solvent.

≥Do not attach labels or stickers to discs. (Do not use discs with exposed adhesive from tape or left over peeled-off stickers.)

≥Do not use scratch-proof protectors or covers.

≥Do not use discs printed with label printers available on the mar- ket.

≥Do not use discs that are badly warped or cracked.

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