Panasonic SCPM86D User Manual download pdf (Page 34)

RQTV0265

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Glossary

Decoder

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

is called decoding.

DivX

DivX is a popular media technology created by DivX, Inc. DivX media

ﬁ les contain highly compressed video with high visual quality that

maintains a relatively small ﬁ le size.

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 Theatre Systems)

This surround system is used in many movie theatres 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.

Film and video

DVD-Videos are recorded using either ﬁ lm or video. This unit can

determine which type has been used, then uses the most suitable

method of progressive output.

Film: Recorded at 25 frames per second (PAL discs) or 24 frames

per second (NTSC discs). (NTSC discs recorded at 30

frames per second as well). Generally appropriate for motion

picture ﬁ lms.

Video: Recorded at 25 frames/50 ﬁ elds per second (PAL discs)

or 30 frames/60 ﬁ elds per second (NTSC discs). Generally

appropriate for TV drama programs or animation.

Frame still and ﬁ eld 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 ﬁ elds. A regular television shows these

ﬁ elds 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 ﬁ elds, so the picture may appear blurred,

but overall quality is high.

A ﬁ eld still is not blurred, but it has only half the information of a frame

still so picture quality is lower.

HDMI (High-Deﬁ nition Multimedia Interface)

HDMI is a next-generation digital interface for consumer electronic

products. Unlike conventional connections, it transmits uncompressed

digital video and audio signals on a single cable. This unit supports

high-deﬁ nition video output (720p, 1080i, 1080p) from the HDMI

AV OUT terminal. To enjoy high-deﬁ nition video, a high-deﬁ nition

compatible television is required.

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.

JPEG (Joint Photographic Experts Group)

This is a system used for compressing/decoding colour still pictures.

If you select JPEG as the storage system on digital cameras, etc., the

data will be compressed to 1/10–1/100 of its original size. The beneﬁ t

of JPEG is less deterioration in picture quality considering the degree

of compression.

Linear PCM (Pulse Code Modulation)

These are uncompressed digital signals, similar to those found on

CDs.

MP3 (MPEG Audio Layer 3)

An audio compression method that compresses audio to

approximately one tenth of its size without any considerable loss of

audio quality.

MPEG4

A compression system for use on mobile devices or a network, that

allows highly efﬁ cient recording at a low bit rate.

Playback control (PBC)

If a Video CD has playback control, you can select scenes and

information with menus.

Progressive/Interlaced

The PAL video signal standard has 576 interlaced (i) scan lines,

whereas progressive scanning, called 576p, uses twice the number

of scan lines. For the NTSC standard, these are called 480i and 480p

respectively.

Using progressive output, you can enjoy the high-resolution video

recorded on media such as DVD-Video. Your television must be

compatible to enjoy progressive video.

Sampling frequency

Sampling is the process of converting the heights of sound wave

(analogue 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.

WMA (Windows Media

Audio)

WMA is a compression format developed by Microsoft Corporation.

It achieves the same sound quality as MP3 with a ﬁ le size that is

smaller than that of MP3.

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