cs4237b Cirrus Logic, Inc., cs4237b Datasheet - Page 70

• Manufacturer Part Number: cs4237b
• Description: Crystalclear Advanced Audio System With 3d Sound
• Manufacturer: Cirrus Logic, Inc.

signal contains the spatial information that al-
lows us to perceive sounds from coming all
around and the directional cues that we use to
determine the localization of those sounds.
Turning up the Space control increases the
amount of corrected directional information, re-
stores the proper localization of the original
sounds, and expands the width of the overall
sound stage. Turning down the Space control re-
sults in having no processed difference signal
component and thus limits the intensity of these
effects.
When SRS 3D sound is first turned on (3DEN in
C3), the Space control (SPC3-SPC0) should be
adjusted before the Center control. Space should
be set to approximately 75% (SPC3-0 = 0011, or
-4.5 dB) with the Center control set to 50%. As
the level of Space is increased, the sound stage
expands both in width and depth. The proper lis-
tening level is subjective and program
dependent. If centered sound information (such
as vocals) seem too low as a result of the Space
control setting, they can be adjusted using the
Center control.
If adjusting the Space control yields no change
in the sound image, the input signal is probably
mono and the Mono-to-Stereo switch, 3DM,
should be enabled.
70
Digital
Mixer
L+R
L-R
R
L
Perspective
Correction
(L-R)p
CTR3-0
Figure 7. SRS Block Diagram
SPC3-0
SRS Center Control
The SRS Center adjustment, CTR3-0 in C2, de-
termines the amount of sum signal (L+R) that is
added to the final left and right digital signals
going to the DACs. The sum signal contains in-
formation common to both channels that is
intended to appear in front or at the center of the
sound stage. Vocals, dialog, solo instruments,
bass, and kick drums are examples of sounds
that are often placed at the center.
When SRS 3D sound is first turned on (3DEN in
C3), the Space control should be adjusted before
the Center control (CTR3-0). Space should be
set to approximately 75% with the Center con-
trol set to 50% (CTR3-0 = 1000, or -12.0 dB).
Turning up the Center control emphasizes the
centered sounds so that their perceived level is
increased and they are brought out and into the
center of the room. Once Space is set, the Center
control should be adjusted to provide a pleasant
balance between the ambient sounds and the
centered sounds.
3DEN
Stereo
16-bit
DAC
-
CS4237B
DS213PP4
Analog
Mixers
To