MSP3421G MICRONAS [Micronas], MSP3421G Datasheet - Page 32

• Manufacturer Part Number: MSP3421G
• Description: Multistandard Sound Processor Family with Virtual Dolby Surround
• Manufacturer: MICRONAS [Micronas]

MSP 34x1G
Table 3–11: Write Registers on I
32
Register
Address
LOUDSPEAKER AND HEADPHONE PROCESSING
00 00
00 06
hex
hex
Function
Volume Loudspeaker
Volume Headphone
bit[15:8]
bit[7:5]
bit[4]
bit[3:0]
With large scale input signals, positive volume settings may lead to signal clipping.
The MSP 34x1G loudspeaker and headphone volume function is divided into a
digital and an analog section. With Fast Mute, volume is reduced to mute posi-
tion by digital volume only. Analog volume is not changed. This reduces any
audible DC plops. To turn volume on again, the volume step that has been used
before Fast Mute was activated must be transmitted.
If the clipping mode is set to “reduce volume”, the following rule is used: To pre-
vent severe clipping effects with bass, treble, or equalizer boosts, the internal
volume is automatically limited to a level where, in combination with either bass,
treble, or equalizer setting, the amplification does not exceed 12 dB.
If the clipping mode is “reduce tone control”, the bass or treble value is
reduced if amplification exceeds 12 dB. If the equalizer is switched on, the gain
of those bands is reduced, where amplification together with volume exceeds
12 dB.
If the clipping mode is “compromise”, the bass or treble value and volume are
reduced half and half if amplification exceeds 12 dB. If the equalizer is switched
on, the gain of those bands is reduced half and half, where amplification
together with volume exceeds 12 dB.
If the clipping mode is “dynamic”, volume is reduced automatically if the signal
amplitudes would exceed 2 dBFS within the IC. For operation of MDB, dyna-
mic mode must be switched on.
volume table with 1 dB step size
7F
7E
...
74
73
72
...
02
01
00
FF
higher resolution volume table
0
1
...
7
0
clipping mode
0
1
2
3
hex
hex
hex
hex
hex
hex
hex
hex
hex
2
C Subaddress 12
Mute (reset condition)
Fast Mute (needs about 75 ms until the signal is com-
pletely ramped down)
must be set to 0
reduce volume
reduce tone control
compromise
dynamic
12 dB (maximum volume)
11 dB
1 dB
0 dB
1 dB
113 dB
114 dB
0 dB
0.125 dB increase in addition to the volume table
0.875 dB increase in addition to the volume table
hex
, continued
PRELIMINARY DATA SHEET
Name
VOL_MAIN
VOL_AUX
Micronas