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47
Dolby Surround
(1) Dolby Digital
Dolby Digital is the multi-channel digital signal format developed by Dolby Laboratories.
Dolby Digital consists of up to “5.1” channels - front left, front right, center, surround left, surround right, and an additional channel exclusively
reserved for additional deep bass sound effects (the Low Frequency Effects – LFE – channel, also called the “.1” channel, containing bass
frequencies of up to 120 Hz).
Unlike the analog Dolby Pro Logic format, Dolby Digital’s main channels can all contain full range sound information, from the lowest bass, up
to the highest frequencies – 22 kHz. The signals within each channel are distinct from the others, allowing pinpoint sound imaging, and Dolby
Digital offers tremendous dynamic range from the most powerful sound effects to the quietest, softest sounds, free from noise and distortion.
2 Dolby Digital and Dolby Pro Logic
Comparison of home surround systems
No. recorded channels (elements)
No. playback channels
Playback channels (max.)
Audio processing
High frequency playback limit of surround
channel
Dolby Digital
5.1 ch
5.1 ch
L, R, C, SL, SR, SW
Digital discrete processing Dolby Digital encoding/decoding
20 kHz
Dolby Pro Logic
2 ch
4 ch
L, R, C, S (SW - recommended)
Analog matrix processing Dolby Surround
7 kHz
2 Dolby Digital compatible media and playback methods
Marks indicating Dolby Digital compatibility: .
The following are general examples. Also refer to the player’s operating instructions.
Media
LD (VDP)
DVD
Others
(satellite broadcasts, CATV, etc.)
Dolby Digital output jacks
Coaxial Dolby Digital RF output jack
1
Optical or coaxial digital output
(same as for PCM)
2
Optical or coaxial digital output
(same as for PCM)
Playback method (reference page)
Set the input mode to “AUTO”.
(Page 44, 45)
Set the input mode to “AUTO”.
(Page 44, 45)
Set the input mode to “AUTO”.
(Page 44, 45)
1 Use a commercially available adapter to connect Dolby Digital RF output signals to the digital input terminals. (Refer to the adapter’s
operating instructions.)
Please refer to the instruction manual of the adapter when making connection.
2 To play in Dolby Digital Surround on the ADV-M51, set “DVD SETUP” – “AUDIO SETUP” – “DIGITAL OUT” to “Normal” in the setup.
(The factory default is “Normal”.)
(2) Dolby Pro Logic II
• Dolby Pro Logic II is a new multi-channel playback format developed by Dolby Laboratories using feedback logic steering technology and
offering improvements over conventional Dolby Pro Logic circuits.
• Dolby Pro Logic II can be used to decode not only sources recorded in Dolby Surround ( ) but also regular stereo sources into five channels
(front left, front right, center, surround left and surround right) to achieve surround sound.
• Whereas with conventional Dolby Pro Logic the surround channel playback frequency band was limited, Dolby Pro Logic II offers a wider
band range (20 Hz to 20 kHz or greater). In addition, the surround channels were monaural (the surround left and right channels were the
same) with previous Dolby Pro Logic, but Dolby Pro Logic II they are played as stereo signals.
•
Various parameters can be set according to the type of source and the contents, so it is possible to achieve optimum decoding (see page 59).
Sources recorded in Dolby Surround
These are sources in which three or more channels of surround have been recorded as two channels of signals using Dolby Surround
encoding technology.
Dolby Surround is used for the sound tracks of movies recorded on DVDs, LDs and video cassettes to be played on stereo VCRs, as well
as for the stereo broadcast signals of FM radio, TV, satellite broadcasts and cable TV.
Decoding these signals with Dolby Pro Logic makes it possible to achieve multi-channel surround playback. The signals can also be played
on ordinary stereo equipment, in which case they provide normal stereo sound.
There are two types of DVD Dolby surround recording signals.
q 2-channel PCM stereo signals
w 2-channel Dolby Digital signals
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DOLBY / DTS SURROUND