Denon AVR-1705 Operating Instructions Manual page 34

ENGLISH
Surround
The AVR-1705 is equipped with a digital signal processing circuit that lets you play program sources in the
surround mode to achieve the same sense of presence as in a movie theater.
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.)
Digital discrete processing
Audio processing
Dolby Digital encoding/decoding
High frequency playback limit of
surround channel
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
Coaxial Dolby Digital RF output jack
LD (VDP)
DVD
Others
(satellite broadcasts, CATV, etc.)
1 Please use a commercially available adapter when connecting the Dolby Digital RF output jack of the
LD player to the digital input jack.
Please refer to the instruction manual of the adapter when making connection.
2 Some DVD digital outputs have the function of switching the Dolby Digital signal output method
between "bit stream" and "(convert to) PCM". When playing in Dolby Digital surround on the AVR-
1705, switch the DVD player's output mode to "bit stream". In some cases players are equipped with
both "bit stream + PCM" and "PCM only" digital outputs. In this case connect the "bit stream + PCM"
jacks to the AVR-1705.
34
Dolby Digital Dolby Pro Logic
5.1 ch
5.1 ch
L, R, C, SL, SR, SW L, R, C, S (SW - recommended)
Analog matrix processing Dolby
Surround
20 kHz
.
Dolby Digital output jacks Playback method (reference page)
Set the input mode to "AUTO".
1 (Page 19)
Optical or coaxial digital output Set the input mode to "AUTO".
(same as for PCM) 2
(Page 19)
Optical or coaxial digital output Set the input mode to "AUTO".
(same as for PCM) (Page 19)
II
(2) Dolby Pro Logic
• Dolby Pro Logic
recorded on two channels into up to 6.1 playback channels, including the surround back channel. Dolby Pro
Logic II x also allows 5.1-channel sources to be played in up to 6.1 channels.
The mode can be selected according to the source. The Music mode is best suited for playing music, the
Cinema mode for playing movies, and the Game mode for playing games. The Game mode can only be
used with 2-channel audio sources.
(3) Dolby Pro Logic II
• Dolby Pro Logic II
logic steering technology and offering improvements over conventional Dolby Pro Logic circuits.
II
• Dolby Pro Logic
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,
II
Dolby Pro Logic
were monaural (the surround left and right channels were the same) with previous Dolby Pro Logic, but
Dolby Pro Logic II
• Various parameters can be set according to the type of source and the contents, so it is possible to achieve
optimum decoding (see page 28).
2 ch
Sources recorded in Dolby Surround
These are sources in which three or more channels of surround have been recorded as two channels of
4 ch
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
7 kHz
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
When either of these signals is input to the AVR-1705, the surround mode is automatically set to Dolby
Pro Logic II when the "DOLBY/DTS SURROUND" mode is selected.
2 Sources recorded in Dolby Surround are indicated with the logo mark shown below
Dolby Surround support mark:
Manufactured under license from Dolby Laboratories.
"Dolby", "Pro Logic" and the double-D symbol are trademarks of Dolby Laboratories.
x
II
x furthers the matrix decoding technology of Dolby Pro Logic
is a new multi-channel playback format developed by Dolby Laboratories using feedback
can be used to decode not only sources recorded in Dolby Surround (
offers a wider band range (20 Hz to 20 kHz or greater). In addition, the surround channels
they are played as stereo signals.
II makes it possible to achieve multi-channel surround
II
to decode audio signals
) but also regular