PRELIMINARY DATA SHEET
MSP 34x2G
Table 3–11: Write Registers on I2C Subaddress 12hex, continued
Register
Address
Function
Name
SURROUND PROCESSING
00 48hex
Output Configuration
bit[15] HP/CS Switch
OUT_CONF
HP_CS
0
Headphone outputs are active (pin names: DACA_L,
DACA_R), CS outputs are muted
1
Center/Surround outputs are active (pin names:
DACM_C, DACM_S), HP outputs are muted
(C corresponds to headphone L, S to headphone R)
The HP/CS switch defines which output pin pair is driven by the DA converters
that are used for headphone or surround processing. The unselected pins are
muted. This makes it convenient to connect the center/surround amplifiers or
outputs to the MSP 34x2G without external switches. The Headphone/Surround
channel should be muted before switching (Set Register 06hex to: 0000hex).
Allow at least 2 s for settling to avoid audible plops.
bit[14:8] Channel Configuration
CHAN_CONF
00hex
STEREO: This mode is used in plain stereo mode. Stan-
dard processing applies to the loudspeaker and head-
phone channels. Surround processing is switched off. In
this mode, the IC is compatible to the MSP 3450G (if
bit[15] is equal to 0).
01hex
TWO_CHANNEL: This mode is used for virtual surround
sound. The surround processing block is active and its left
and right outputs are distributed to the loudspeaker output
channel. The processing on the headphone channel
remains standard. In this mode, the IC is comparable to
the MSP 3451G.
02hex
MULTI_CHANNEL: This mode is used for surround sound
with more than 2 channels. The surround processing block
is active and its left and right outputs are distributed to the
loudspeaker output channel, its center and surround out-
puts are distributed to the headphone output channel. No
headphone processing is possible. In this mode, it is con-
venient to select the newly implemented C/S pins by set-
ting bit[15] to 1.
bit[7:0]
00hex
must be 0
00 49hex
Spatial Effects for Surround Processing
SUR_SPAT
bit[15:8] Spatial Effect Strength
7Fhex
3Fhex
...
Enlargement 100%
Enlargement 50%
01hex
00hex
Enlargement 1.5%
Effect off
bit[7:0]
00hex
must be 0
Increases the perceived basewidth of the reproduced left and right front chan-
nels. Recommended value: 50% = 40hex. In contrast to the spatial effect for the
loudspeaker channel, the surround spatial effect is optimized for surround
sound. Note: If surround sound processing is active, the spatial effect for the
loudspeaker channel (Register 05hex) is switched off.
Micronas
43
MICRONAS [ MICRONAS ]
