Glossary/Maintenance, Decoder, Dolby Digital

Glossary

Decoder

A decoder restores the coded audio signals on DVD’s to normal. This is called decoding.

Dolby Digital

This is a method of coding digital signals developed by Dolby Laboratories. 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.

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.

Dynamic range

Dynamic range is the difference between the lowest level of sound that can be heard above the noise of the equipment and the highest level of sound before distortion occurs.

Frame still and field still

		Frames 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
		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
	Glossary/Maintenance	frame still so picture quality is lower.
	Glossary/Maintenance	Maintenance
		Maintenance
		Clean this unit with a soft, dry cloth.
		≥Never use alcohol, paint thinner or benzine to clean this unit.
		≥Before using chemically treated cloth, carefully read the
		instructions that came with the cloth.
		Do not use commercially available lens cleaners as they may
		cause malfunction. (Cleaning of the lens is generally not necessary
		although this depends on the operating environment.)

RQT7978

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, similar to those found on CDs.

Playback control (PBC)

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

Sampling frequency

Sampling is the process of converting the heights of sound wave (analog signal) samples taken at set periods into digits (digital encoding). Sampling frequency is the number of samples taken per second, so larger numbers mean more faithful reproduction of the original sound.

Before moving the unit, ensure the disc tray is empty.

Failure to do so will risk severely damaging the disc and the unit.