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MSP4458 Datasheet(PDF) 29 Page - Micronas

Part # MSP4458
Description  Multistandard Sound Processor
PDF  85 Pages
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Manufacturer  MICRONAS [Micronas]
Direct Link  http://www.micronas.com
Logo MICRONAS - Micronas

MSP4458 Datasheet(HTML) 29 Page - Micronas

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PRELIMINARY DATA SHEET
MSP 44x8G
Micronas
29
MAIN AND AUX PROCESSING
00 00hex
00 06hex
Volume Main
Volume Aux
bit[15:8]
volume table with 1 dB step size
7Fhex
+12 dB (maximum volume)
7Ehex
+11 dB
...
74hex
+1dB
73hex
0dB
72hex
−1dB
...
02hex
−113 dB
01hex
−114 dB
00hex
Mute (reset condition)
FFhex
Fast Mute (needs about 75 ms until the signal is com-
pletely ramped down)
bit[7:5]
higher resolution volume table
0
+0dB
1
+0.125 dB increase in addition to the volume table
...
7
+0.875 dB increase in addition to the volume table
bit[4:0]
not used
must be set to 0
With large scale input signals, positive volume settings may lead to signal clipping.
The MSP 44x8G Main and Aux volume function is divided into a digital and an
analog section. With Fast Mute, volume is reduced to mute position by digital vol-
ume 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.
VOL_MAIN
VOL_AUX
0029hex
Automatic Volume Correction (AVC)
bit[15]
0
AVC off, reset of internal variables
1AVC on
bit[14]
0
AVC in Main path
1
AVC in Mixer path
bit[13:12]
0
must be set to zero
bit[11:8]
8
8 s decay time
4
4 s decay time (recommended)
2
2 s decay time
1
20 ms decay time (should be used for approx. 100 ms
after channel change)
AVC
AVC_DECAY
00 34hex
Preemphasis Aux Channel
bit[15:8]
00hex
Preemphasis OFF
7Fhex
Preemphasis 50
µs (−3 dB scaling)
FFhex
Preemphasis 75
µs (−3 dB scaling)
PREEMP_AUX
Table 3–11: Write Registers on I2C Subaddress 12hex, continued
Register
Address
Function
Name



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