參數(shù)資料
型號： STV8247
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)： 65/149頁
文件大小： 2775K
代理商： STV8247
65/149
STV82x7
Register List
SQTH1
Channel 1 FM Squelch Threshold Register
CAROFFSET1
Channel 1 DCO Carrier Offset Compensation
Bit Name
Reset
Function
CETH1[7:0]
00100000
This register is used to compare the carrier level in the channel and the threshold value. This
level is measured after the channel filter and is relative to the full scale reference level (0 dB).
This is used as part of the validation of an FM signal, if the carrier level is below the threshold,
the signal is considered to be non-valid.
CETH
FFh
80h
40h
20h
Threshold (dB)
-6
-12
-18
-24 (Default)
CETH
10h
08h
00h
Threshold (dB)
-32 (Recommended Value)
-38
OFF (all carrier levels are accepted)
Address: 21h
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
SQTH1[7:0]
Bit Name
Reset
Function
SQTH1[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: 22h
Type: R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
CAROFFSET1[7:0] (S)
Bit Name
Reset
Function
CAROFFSET1[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 CARFQ1 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 displays by
DC_REMOVAL_L
and
DC_REMOVAL_R
can
be directly loaded in CAROFFSET1 to exactly compensate the carrier offset on Channel 1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
STV8247_06 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
STV8247D 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
STV8247DSX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
STV8247DSXT 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
STV8247DT 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
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