參數(shù)資料
型號: STV8207
廠商: 意法半導體
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
文件頁數(shù): 71/149頁
文件大?。?/td> 2775K
代理商: STV8207
71/149
STV82x7
Register List
SQTH2
Channel 2 FM Squelch Threshold
CAROFFSET2
Channel 2 DCO Carrier Offset Compensation
12.7
NICAM Registers
NICAM_CTRL
NICAM Decoder Control Register
Address: 39h
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
SQTH2[7:0]
Bit Name
Reset
Function
SQTH2[7:0]
00111100
The squelch detector measures the level of high frequency noise (> 40 kHz) and compares it to
the threshold level (SQTH). If the level is below this value, the S/N of the FM signal is
considered to be acceptable. Values are given for FM with standard deviation.
SQTH
S/N (dB)
FAh
77h
3Ch
23h
19h
0
10
15 (Default)
20
25
Address: 3Ah
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
CAROFFSET2[7:0] (S)
Bit Name
Reset
Function
CAROFFSET2[7:0]
00000000
This value is used to correct the carrier frequency offset of the incoming IF signal. Automatic
frequency control in FM mode can be implemented by registers
DC_REMOVAL_L
and
DC_REMOVAL_R
.
A DCO frequency offset (in two’s complement format) is added to the pre-programming value
by AUTOTSD in the CARFQ2 registers (corresponding to the standard IF carrier frequency).
The programmable carrier offset ranges from -192 kHz to +190.5 kHz with a resolution of
1.5 kHz.
For standard FM deviation, the value displayed by register
DC_REMOVAL_R
can be directly
loaded in register
CAROFFSET2
to exactly compensate the carrier offset on Channel 2.
Address: 3Dh
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0
0
DIF_POL
ECT
MAE
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