AVR 75 (serv.man3) - Harman Kardon Audio User Guide / Operation Manual. Page 33

Advanced Features

AVR75 120   rev (c) 8/27/97

31

The first time a PCM source is played the
AVR75 will automatically select the
Stereo mode, but you may then select
any surround mode desired.

Recording When Digital Sources 
Are In Use
Since the record outputs of the AVR75 
are traditional two-channel stereo, the
multichannel outputs of a Dolby Digital
signal may not be recorded. When any

digital signal is being played, the accom-
panying analog audio signal is sent to
the 

and 

jacks 

£

∞ e h

. The video source being output

is the last selected video input shown in
the 

indicator 

P

.

DOLBY DIGITAL

DOLBY PRO LOGIC

DOLBY 3 STEREO

MOVIE SURROUND

HALL SURROUND

MATRIX SURROUND

STEREO

This mode is used only when the source material is encoded with Dolby Digital (AC-3)
data. It provides up to five separate main audio channels and a special dedicated Low-
Frequency Effects channel. Use this mode with DVD, LV or HDTV sources featuring
Dolby Digital playback.

Dolby Pro Logic is the standard mode for surround sound decoding. It uses 
information encoded in a two-channel stereo recording to produce four distinct 
channels: Left, Center, Right and Surround. Use this mode for accurate reproduction
of programs bearing the Dolby Surround, DTS Stereo, UltraStereo or other
“Surround” logos. Surround encoded programs include videocassette, DVD and LD
movies, TV and cable programs, radio programs and audio CDs. Dolby Pro Logic 
processing may also be used to provide a pleasing surround effect with some 
stereophonic source material that does not carry surround encoding.

Dolby 3 Stereo uses the information contained in a surround encoded or two-channel
stereo program to create center channel information. In addition, the information
that is normally sent to the rear channel surround speakers is carefully mixed in with
the front left and right channels for increased realism. Use this mode when you have a
center channel speaker, but no surround speakers.

Movie Surround processing uses matrix surround decoding, with the option to extend
the delay time to 90 ms. Use this to experiment with surround times above 30 ms, or if
the delay time formula suggests a longer time delay for your room.

This mode is designed for use with stereo recordings. It provides a sound-field effect
that simulates the complex combination of direct and reflected sounds that create 
the rich reverberant atmosphere of a medium-sized circular concert hall.

This mode is designed for use with sports broadcasts, live concerts or other programs
where the feeling of a wide surround effect is desired.

This mode turns off all surround processing and presents the pure left and right 
channel presentation of two channel stereo programs.

Center: 0 ms – 5 ms
Surround: 0 ms – 15 ms

15 ms – 30 ms
Initial Setting = 20 ms

No Surround Channels

40 ms – 90 ms
Initial Setting = 40 ms

40 ms – 90 ms
Initial Setting = 40 ms

40 ms – 90 ms
Initial Setting = 40 ms

No Surround Channels

AVR75 om (c)  9/16/98 11:33 AM  Page 31