DATA SHEET
MSP 34x0G
Table 3–11: Write Registers on I2C Subaddress 12hex, continued
Register
Address
Function
Name
00 05hex
Spatial Effects Loudspeaker Channel
SPAT_MAIN
bit[15:8] Effect Strength
7Fhex
3Fhex
...
Enlargement 100%
Enlargement 50%
01hex
00hex
FFhex
...
Enlargement 0.78%
Effect off
reduction 0.78%
C0hex
80hex
reduction 50%
reduction 100%
bit[7:4]
bit[3:0]
Spatial Effect Mode
0hex Stereo Basewidth Enlargement (SBE) and
Pseudo Stereo Effect (PSE). (Mode A)
2hex
Stereo Basewidth Enlargement (SBE) only. (Mode B)
Spatial Effect High-Pass Gain
0hex
2hex
4hex
6hex
8hex
max. high-pass gain
2/3 high-pass gain
1/3 high-pass gain
min. high-pass gain
automatic
There are several spatial effect modes available:
In mode A (low byte = 00hex), the spatial effect depends on the source mode. If
the incoming signal is mono, Pseudo Stereo Effect is active; for stereo signals,
Pseudo Stereo Effect and Stereo Basewidth Enlargement is effective. The
strength of the effect is controllable by the upper byte. A negative value reduces
the stereo image. A strong spatial effect is recommended for small TV sets
where loudspeaker spacing is rather close. For large screen TV sets, a more
moderate spatial effect is recommended.
In mode B, only Stereo Basewidth Enlargement is effective. For mono input sig-
nals, the Pseudo Stereo Effect has to be switched on.
It is worth mentioning, that all spatial effects affect amplitude and phase
response. With the lower 4 bits, the frequency response can be customized. A
value of 0hex yields a flat response for center signals (L = R), but a high-pass
function for L or R only signals. A value of 6hex has a flat response for L or R
only signals, but a low-pass function for center signals. By using 8hex, the fre-
quency response is automatically adapted to the sound material by choosing an
optimal high-pass gain.
Micronas
May 27, 2003; 6251-476-1DS
37
MICRONAS [ MICRONAS ]
