MSP 34x0G
DATA SHEET
Table 3–11: Write Registers on I2C Subaddress 12hex, continued
Register
Address
Function
Name
SUBWOOFER OUTPUT CHANNEL
00 2Chex Subwoofer Level Adjustment
SUBW_LEVEL
bit[15:8] 0Chex
+12 dB
...
01hex
00hex
FFhex
...
+1 dB
0 dB (default)
−1 dB
E3hex
E2hex
...
−29 dB
−30 dB
80hex
Mute
bit[7:0]
00hex
must be zero
If Micronas BASS is added onto the main channel, this register should be set to
00hex
00 2Dhex
Subwoofer Corner Frequency
SUBW_FREQ
bit[15:8] 5...40dec corner frequency in 10 Hz steps
(range: 50...400 Hz)
If Micronas BASS is active, SUBW_FREQ must be set to a value higher than
the MB Lowpass Frequency (MB_LP). Choosing the corner frequency of the
subwoofer closer to MB_LP results in a narrower MB frequency range. Recom-
mended value: 1.5×MB_LP
Subwoofer Characteristics
SUBW_CHAR
bit[7:4]
0hex
1hex
2hex
3hex
sharp edge Subwoofer characteristics (default)
medium edge Subwoofer characteristics
soft edge Subwoofer characteristics
very soft edge Subwoofer characteristics
An adjustable subwoofer filter characterisitic with four different filter sets can be
selected. Due to the complementary filter design, the output of high- and low-
pass filter add up to 0db at the crossover region for all filter sets.
Subwoofer Complementary High-Pass Filter
SUBW_HP
bit[3:0]
0hex
1hex
loudspeaker channel unfiltered
a complementary high-pass is processed in the loud-
speaker output channel
2hex
Micronas BASS added onto main channel
MICRONAS BASS (MB) CONTROL REGISTERS
00 68hex Micronas BASS Effect Strength
MB_STR
bit[15:8] 00hex
7Fhex
Micronas BASS OFF (default)
maximum Micronas BASS
bit[7:0]
00hex
must be zero
The Micronas BASS effect strength can be adjusted in 1dB steps. A value of
44hex will yield a medium Micronas BASS effect.
38
May 27, 2003; 6251-476-1DS
Micronas
MICRONAS [ MICRONAS ]
