Dolby Pro Logic Surround
Glossary
As one method of decoding Dolby Surround,
Dolby Pro Logic Surround produces four
Albumchannels from two-channel sound. Compared
Section of a music piece on a data CDwith the former Dolby Surround system, Dolby
Pro Logic Surround reproduces left-to-rightcontaining MP3 audio tracks.
panning more naturally and localizes sounds
Bit Ratemore precisely. To take full advantage of
Value indicating the amount of video dataDolby Pro Logic Surround, you should have
compressed in a DVD per second. The unit isone pair of rear speakers and a centre speaker.
Mbps (Mega bit per second). 1 Mbps indicatesThe rear speakers output monaural sound.
that the data per second is 1,000,000 bits. The
DTShigher the bit rate is, the larger the amount of
Digital audio compression technology that thedata. However, this does not always mean that
you can get higher quality pictures.Digital Theater Systems, Inc. developed. This
technology conforms to 5.1-channel surround.
ChapterThe rear channel is stereo and there is discrete
Sections of a picture or a music piece on asubwoofer channel in this format. DTS
DVD that are smaller than titles. A title isprovides the same 5.1 discrete channels of high
composed of several chapters.quality digital audio. The good channel
separation is realized because the all channel
Dolby Digital
data is recorded discrete and processed in
This sound format for movie theaters is moredigital.
advanced than Dolby Pro Logic Surround. In
this format, the rear speakers output stereoDVD
sound with an expanded frequency range and aA disc that contains up to 8 hours of moving
subwoofer channel for deep bass is pictures even though its diameter is the same as
independently provided. This format is alsoa CD.
called O5.1� because the subwoofer channel isThe data capacity of a single-layer and single-
counted as 0.1 channel (since it functions only
sided DVD, at 4.7 GB (Giga Byte), is 7 times
when a deep bass effect is needed). All six
that of a CD. Furthermore, the data capacity of
channels in this format are recorded separately
a dual-layer and single-sided DVD is 8.5 GB, a
to realize superior channel separation.
single-layer and double-sided DVD 9.4 GB,
Furthermore, since all the signals are processed
and a dual-layer and double-sided DVD 17 GB.
digitally, less signal degradation occurs.
The picture data uses the MPEG 2 format, one
Dolby Pro Logic IIof the worldwide standards of digital
Dolby Pro Logic II creates five full-bandwidthcompression technology. The picture data is
output channels from two-channel sources.compressed to about 1/40 of its original size.
This is done using an advanced, high-purityThe DVD also uses the variable rate coding
matrix surround decoder that extracts thetechnology that changes the data to be allocated
spatial properties of the original recordingaccording to the status of the picture.
without adding any new sounds or tonalThe audio data is recorded in Dolby Digital as
colorations.well as in PCM, allowing you to enjoy more
real audio presence. Furthermore, various
advanced functions such as the multi-angle,
multilingual, and Parental Control functions are
provided with the DVD.
GB
70 |
ACEC
