stv8226t STMicroelectronics, stv8226t Datasheet - Page 69

• Manufacturer Part Number: stv8226t
• Description: Multistandard Tv Audio Processor And Digital Sound Demodulator
• Manufacturer: STMicroelectronics

STV82x6
Note: 1 When the SVC is in Automatic mode (SVC_ON = 1), internal clipping may occur with a high
SVC_TIME[1:0]
SVC_REF[4:0]
Bit Name
2 A mute of the corresponding audio output is recommended before switching ON/OFF. A gain
reference level (REF_LEVEL = -2.5 or -6 dB). The maximum recommended value is -8.5 dB.
discontinuity may create annoying audible plops.
SVC_REF[4:0]
00000 (Default)
> 00101
<10110
00101
00100
00011
00010
00001
11111
11110
11101
11100
11011
11010
11001
11000
10111
10110
Reset
00000
10
SVC_ON = 0
Defines the constant time of the gain loop.
00:
01:
10:
11:
Smart Volume Control Reference Level Select
If SVC_ON = 0, this value defines the prescaling gain ranging from -30 dB to +15.5 dB.
If SVC_ON = 1, this value defines the output reference level of the regulation ranging from -2.5 dB
down to -30 dB. The SVC output level must be adjusted to avoid internal clipping due to post-
processing with amplification, i.e. ST/SRS™ Surround Sound (+9 dB max), Equalizer or Bass/
Treble (+12 dB max) and Loudness (+6 dB max). Programmable values are listed in
REF_LEVEL (dB)
Time Constant for 6 dB Amplification
16 s (Default)
8 s
4 s
2 s
Reserved
Reserved
+15.5
-14.5
-20.5
-26.5
+9.5
-2.5
-8.5
+12
-12
-18
-24
-30
3.5
-6
6
0
Table 23: SVC Bit Values
SVC_REF[4:0]
Function
> 00101
< 10110
11111
11110
00101
00100
00011
00010
00001
00000
11101
11100
11011
11010
11001
11000
10111
10110
1
1
SVC_ON = 1
REF_LEVEL (dB)
Reserved
Reserved
-14.5
-20.5
-26.5
-8.5
-2.5
-12
-12
-12
-12
-12
-12
-12
-18
-24
-30
-6
Register List
Table
23.
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