Yamaha AV-90PY - Manual (Page 17)

17
Notes on Operation of Sound Field Programs
● In the CONCERT VIDEO, MONO MOVIE, ROCK CONCERT
and CONCERT HALL, no sound is heard from the center
speaker.
● When the monaural sound source is played in the DOLBY
PRO LOGIC or ENHANCED, no sound is heard from the
front speakers and the rear speakers. Sound is heard only
from the center speaker. However, if the center mode is in
the PHANTOM, the front speakers output the sound of the
center speaker.
● If you connect an external amplifier to this unit, see if it has a
built-in surround sound or ambience circuitry. If it does, then
be sure that the surround or ambience circuitry on that
amplifier is off while you are using the digital sound field
processor’s Dolby Pro Logic Surround decoding function.
● When this unit is in the Dolby Pro Logic Surround mode, if
the main-source sound is considerably altered by
overadjustment of the BASS or TREBLE controls, the
relationship with the center and rear channels may produce
an unnatural effect.
Description of Dolby Pro Logic Surround
DOLBY PRO LOGIC SURROUND: This unit employs the
Dolby Pro Logic Surround system. This system is similar to
professional Dolby Stereo decoders used in movie theaters.
The Dolby Pro Logic Surround system, by employing a four-
channel system, divides the input signals into four levels: the
left and right main channels, the center channel (to characterize
dialogue), and the rear surround-sound channels (to
characterize sound effects, background noise and other ambient
noise).
Dolby Surround is encoded on the sound track of commercially
available video cassettes and video discs as well. When you
play a source encoded with Dolby Surround on your home video
system, the Dolby Pro Logic Surround mode on this unit
decodes the signal and feeds the surround-sound effects.
The Dolby Pro Logic Surround mode may not be always
effective on video sources not encoded with Dolby Surround.
Manufactured under license from Dolby Laboratories Licensing
Corporation. Additionally licensed under one or more of the
following patents: U.S. numbers 3,632,886, 3,746,792, and
3,959,590; canadian numbers 1,004,603 and 1,037,877.
“Dolby” and the double-D symbol are trademarks of Dolby
Laboratories Licensing Corporation.