Hitachi DV-DS163E Service Manual page 20

General Description > List of Abbreviations and Terms for DVD Recorder
Index Abbreviation/Term
I/P/B
I
J JPEG
M MPEG
MPEG Audio Layer
2
MP3
O Optical digital audio
output
P Pan & Scan/
Letterbox
Playback Control
(PBC)
Progressive
playback function
S S-Video Output
Sampling
Frequency
W WMA
3D surround
Num.
DVD recorders normally use data that is common between images, and
individually record different data for each image.
I-picture: Images recorded independently for the reference of commonly used
data.
P-picture: Images created from past I-picture or P-picture
B-picture: Images created from both I and P pictures, which interact between
both types
Since I-picture delivers the highest image quality, selecting I-picture is
recommended when adjusting image quality.
Joint Photographic Expert Group: International standard format for compressing
still images.
Moving Picture Experts Group: Standard related to compression of digital video
and audio. MPEG2 is a higher standard of MPEG and is applied to video (movie)
requiring higher quality.
One of three audio compression standards (layers 1-3) defi ned by MPEG
MPEG1 Audio Layer-3: Audio data digital compression technology.
Audio is usually converted to an electrical signal and transmitted from DVD to
a device such as amp: When audio is converted to a digital signal, this optical
digital audio output can be transmitted on optical fi ber.
Most DVD videos are produced assuming that they will be displayed on wide
TV screen (aspect ratio of 16:9): If they are displayed on TV screens with 4:3
aspect ratio, 16:9 images will not quite fi t on 4:3 screens. There are two ways of
displaying 16:9 images on 4:3 TV:
· Pan & Scan: Cuts out the left and right ends of images and displays them on
whole screen.
· Letterbox: Reproduces 16:9 images on 4:3 screens with black bands across the
top and bottom of screen.
One format to play Video CD: User can select desired screens and data while
watching the displayed menu screen.
This function converts interlaced images to non-interlaced images and displays
them. It can play back 24-frame/second images included in DVD movie software,
etc.
The video signal is separated into chrominance (C) and luminance (L) signals
and transmitted to TV: This delivers clearer images.
Sampling slices audio waves (analog signal) at a specifi ed time interval, and
digitizes the levels of the sliced waves. The slicing number per second is referred
to as the sampling frequency: The higher the number, the closer the sound to the
original.
Windows Media Audio: Codec that was developed by Microsoft Corporation in
USA.
This technology localizes sound at any position using only two front speakers,
by subjecting the L and R signals to matrix operation. It uses the four transfer
functions from L/R speakers located at specifi ed positions to both ears of listener
located in a specifi ed position, taking into account the shape of head and the
effect of earlobes, and the two transfer functions from any position to both ears.
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Explanation