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STV8227 数据表(PDF) 65 Page - STMicroelectronics

部件名 STV8227
功能描述  Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STV8227 数据表(HTML) 65 Page - STMicroelectronics

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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
Threshold (dB)
CETH
Threshold (dB)
FFh
-6
10h
-32 (Recommended Value)
80h
-12
08h
-38
40h
-18
00h
OFF (all carrier levels are accepted)
20h
-24 (Default)
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
0
77h
10
3Ch
15 (Default)
23h
20
19h
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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