MSP3410B Datasheet, PDF (27/68 Pages) Micronas – Multistandard Sound Processor

PRELIMINARY DATA SHEET
MSP 3410 B
Volume Loudspeaker Channel
Volume loudspeaker
channel
+12 dB
+11 dB
+1 dB
0 dB
–1 dB
–77 dB
–94 dB
Mute
0000_hex
H
0111 1111
7F_hex
0111 1110
7E_hex
0111 0100 74_hex
0111 0011
0111 0010
73_hex
72_hex
0010 0110 26_hex
0001 0101 15_hex
0000 0000... 0 –
0001 0100 14_hex
The highest positive 8 bit number yields in a maximum
possible gain of 12 dB. Decreasing the volume register
by 1 LSB decreases volume by 1 dB. The minimum vol-
ume without loudness is –77 dB. Together with loud-
ness, the volume range can be increased by the actual
loudness setting. Setting loudness to 17 dB, the lowest
possible volume is –94 dB. Volume settings lower than
the given minimum mute the output. With large scale in-
put signals, positive volume settings may lead to signal
clipping.
To prevent severe clipping effects with bass or treble
boosts, the internal volume is automatically limited to a
level where in combination with either bass or treble set-
ting the amplification does not exceed 12 dB. For exam-
ple: setting bass to +9 dB and treble to +5, the maximum
possible volume is +3 dB. Values higher than +3 dB are
internally limited to +3 dB.
Please consider that even if the loudspeaker or the
headphone or both channels are not used ( i.e. satellite
receiver, video recorder), they must be initialized after
reset according to the tables Volume Loudspeaker
Channel shown above and Volume Headphone Chan-
nel on page 28.
Balance Loudspeaker Channel
Balance loudspeaker
channel [L/R]
Left muted, Right 100%
Left 0.8%, Right 100%
Left 99.2%, Right 100%
Left 100%, Right 100%
Left 100%, Right 99.2%
Left 100%, Right 0.8%
Left 100%, Right muted
0001_hex
0111 1111
0111 1110
0000 0001
0000 0000
RESET
1111 1111
1000 0010
1000 0001
H
7F_hex
7E_hex
01_hex
00_hex
FF_hex
82_hex
81_hex
Positive balance settings reduce the left channel without
affecting the right channel, negative settings reduce the
right channel leaving the left channel at 100%. A step by
1 LSB decreases or increases the balance by about
0.8% (exact figure: 100/127).
Bass Loudspeaker Channel
Bass loudspeaker
channel
+12 dB
+11 dB
+1 dB
0 dB
–1 dB
–11 dB
–12 dB
0002_hex
0110 0000
0101 1000
0000 1000
0000 0000
RESET
1111 1000
1010 1000
1010 0000
H
60_hex
58_hex
08_hex
00_hex
F8_hex
A8_hex
A0_hex
With positive bass settings internal overflow may occur
even with overall volume less than 0 dB. This will lead to
a clipped output signal. Therefore, it is not recom-
mended to set bass to a value that, in conjunction with
volume, would result in an overall positive gain.
ITT Semiconductors
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