參數(shù)資料
型號(hào): STV8227
廠商: 意法半導(dǎo)體
英文描述: Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
中文描述: 數(shù)字音頻解碼器/處理器為A2和麗音電視/錄像機(jī)
文件頁數(shù): 66/149頁
文件大?。?/td> 2775K
代理商: STV8227
Register List
STV82x7
66/149
12.6
Demodulator Channel 2
IAGCR
Channel 2 Internal AGC Reference for QPSK
IAGCC
Channel 2 Internal AGC Time Constant for QPSK
Address: 25h
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
IAGC_REF[7:0]
Bit Name
Reset
Function
IAGC_REF[7:0]
10001000
Sets the mean value of the internal AGC, used for QPSK demodulation. The default setting
corresponds to half full scale amplitude at the baseband PLL input.
Address: 26h
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
IAGC_OFF
FAR_FLT_EN
MONO_FLT_EN
BG_SEL
MONO_PROG
IAGC_CST[2:0]
Bit Name
Reset
Function
IAGC_OFF
0
AGC Disable
0: Internal AGC is active
1: Internal AGC is disabled
FAR_FLT_EN
0
1: Enable Farrow filter for NICAM
MONO_FLT_EN
0
1: Enable Mono filter for NICAM
BG_SEL
0
1: BG NICAM Mono filter selected
MONO_PROG
0
1: Enable programmation of Mono filter
IAGC_CST[2:0]
011
Internal AGC Programmable Step Constant
.
These bits control the time per step (values given for QPSK mode). The default value defines the
optimum trade-off between fast settling time (for the fastest NICAM identification) and the noise
immunity (minimum BER degradation)
Step time (us) Time Response (ms)
000
001
010
011
100
101
110
111
703
352
176
88
44
22
11
5.5
128
64
32
16
8
4
2
0.82
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