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| 型號： | MSP34X1G |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Multistandard Sound Processor Family with Virtual Dolby Surround |
| 中文描述： | 多標準聲音處理器系列與虛擬杜比環(huán)繞聲 |
| 文件頁數(shù)： | 90/104頁 |
| 文件大小： | 871K |
| 代理商： | MSP34X1G |
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MSP 34x1G
PRELIMINARY DATA SHEET
90
Micronas
6.3.4. Register AD_CV
The use of this register is no longer recommended.
Use it only in cases where compatibility to the
MSP 34x0D is required. Using the STANDARD
SELECTION register together with the MODUS regis-
ter provides a more economic way to program the
MSP 34x1G.
Note:
This register is initialized during STANDARD SELECTION and is automatically updated when Automatic
Sound Select (MODUS[0]=1) is on.
Table 6
–
9:
AD_CV Register; reset status: all bits are
“
0
”
AD_CV
(00 BB
hex
)
Automatic setting by
STANDARD SELECT Register
Bit
Function
Settings
2-8, 0A-60
hex
9
[0]
not used
must be set to 0
0
0
[1:6]
Reference level in case of Automatic Gain
Control = on (see Table 6
–
10). Constant
gain factor when Automatic Gain Control =
off (see Table 6
–
11).
101000
100011
[7]
Determination of Automatic Gain or
Constant Gain
0 = constant gain
1 = automatic gain
1
1
[8]
Selection of Sound IF source
(identical to MODUS[8])
0 = ANA_IN1
+
1 = ANA_IN2
+
X
X
[9]
MSP-Carrier-Mute Feature
0 = off: no mute
1 = on: mute as de-
scribed in section 2.2.2.
1
0
[10:15]
not used
must be set to 0
0
0
X : not affected while choosing the TV sound standard by means of the STANDARD SELECT Register
Table 6
–
10:
Reference Values for Active AGC (AD_CV[7] = 1)
Application
Input Signal Contains
AD_CV [6:1]
Ref. Value
AD_CV [6:1]
in integer
Range of Input Signal
at pin ANA_IN1
+
and ANA_IN2
+
Terrestrial TV
FM Standards
NICAM/FM
NICAM/AM
NICAM only
1 or 2 FM Carriers
1 FM and 1 NICAM Carrier
1 AM and 1 NICAM Carrier
1 NICAM Carrier only
101000
101000
100011
010100
40
40
35
20
0.10
3 V
pp1)
0.10
3 V
pp1)
0.10
1.4 V
pp
(recommended: 0.10
0.8 V
pp
)
0.05
1.0 V
pp
SAT
1 or more FM Carriers
100011
35
0.10
3 V
pp1)
ADR
FM and ADR carriers
see DRP 3510A data sheet
1)
For signals above 1.4 V
pp
, the minimum gain of 3 dB is switched, and overflow of the A/D converter may result. Due to the
robustness of the internal processing, the IC works up to and even more than 3 V
pp
, if norm conditions of FM/NICAM or
FM1/FM2 ratio are supposed. In this overflow case, a loss of FM-S/N ratio of about 10 dB may appear.
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