MSP 3400C
PRELIMINARY DATA SHEET
7.1.1. Volume Loudspeaker Channel and Head-
phone Channel
Clipping Mode
loudspeaker
0000
0006
x000
3 LSBs
3 LSBs
hex
Clipping Mode
headphone
Volume
loudspeaker
0000
11 MSBs
11 MSBs
hex
hex
hex
Reduce Volume
0
hex
Volume
0006
RESET
headphone
Reduce Tone Control
Compromise Mode
x001
1
+12 dB
0111 1111 000x 7F0
hex
hex
x010
2
hex
+11.875 dB
0111 1110 111x 7EE
hex
+0.125 dB
0 dB
0111 0011 001x 732
0111 0011 000x 730
hex
If the clipping mode is set to “Reduce Volume”, the fol-
lowing clipping procedure is used: To prevent severe
clippingeffectswithbass, treble, orequalizerboosts, the
internal volume is automatically limited to a level where,
in combination with either bass, treble, or equalizer set-
ting, the amplification does not exceed 12 dB.
hex
–0.125 dB
0111 0010 111x 72E
hex
–113.875dB
–114 dB
Mute
0000 0001 001x 012
0000 0001 000x 010
hex
hex
hex
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
isreduced, whereamplificationtogetherwithvolumeex-
ceeds 12 dB.
0000 0000 xxxx 00x
RESET
Fast Mute
1111 1111 111x FFE
hex
If the clipping mode is “Compromise Mode”, the bass or
treble value and volume are reduced half and half if am-
plification exceeds 12 dB (see example below). If the
equalizer is switched on, the gain of those bands is re-
duced half and half, where amplification together with
volume exceeds 12 dB.
The highest given positive 11-bit number (7F0 ) yields
hex
in a maximum possible gain of 12 dB. Decreasing the
volume register by 1 LSB decreases the volume by
0.125 dB. Volume settings lower than the given mini-
mum mute the output. With large scale input signals,
positive volume settings may lead to signal clipping.
With Fast Mute, volume is reduced to mute position by
digital volume only. Analog volume is not changed. This
reduces any audible DC plops. Going back from Fast
Mute should be done to the volume step before Fast
Mute was activated.
Example:
Vol.:
+6 dB
Bass:
+9 dB
Treble:
+5 dB
Red. Volume
Red. Tone Con.
Compromise
3
9
5
5
5
6
6
4.5
7.5
MICRONAS INTERMETALL
31
MICRONAS [ MICRONAS ]
