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參數(shù)資料
| 型號(hào)： | STV8236 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Multistandard TV Audio Processor and Digital Sound Demodulator |
| 中文描述： | 多標(biāo)準(zhǔn)電視音頻處理器和數(shù)字聲音解調(diào)器 |
| 文件頁(yè)數(shù)： | 13/97頁(yè) |
| 文件大?。?/td> | 1871K |
| 代理商： | STV8236 |
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13/97
STV82x6
Demodulator Block
Each mono and stereo standard can be removed (or added) from the List of Standards to be
recognized by programming registers
AUTO_SCKM
and
AUTO_SCKST
, respectively. The identified
standard is displayed in register
AUTO_STAT
and any change to standard is flagged to the host
system via pin IRQ. This flag must be reset by re-programming the MSBs of register
AUTO_CTRL
while checking the detected standard status by reading registers
AUTO_STAT
,
NICAM_STAT
and
ZWT_STAT
. Moreover, the detection of Stereo mode during demodulation is also flagged in register
AUTO_STAT
and on output pin ST.
Important
: L/L and D/K standards cannot be automatically processed because the same frequency
is used for the MONO carrier. An exclusive L/DK selection must programmed in register
AUTO_CTRL
. This may be externally controlled by detecting the RF modulation sign, which is
negative for all TV standards except L/L.
To recover out-of standard FM deviations or the Sound Carrier Frequency Offset, additional I2C
controls are provided without interfering with the Automatic Standard Recognition System
(AUTOSTD).
DK-NICAM Overmodulation Recovery
: Four different FM deviation ranges can be selected (via
register
AUTO_CTRL
) for the DK standard while the AUTOSTD system remains active. The
maximum FM deviation is 500 kHz in DK Mono mode and 350 kHz in DK NICAM mode (limited by
overlapping FM and NICAM spectrum values). The demodulated signal peak level (proportional to
the FM deviation) is detected by the Peak Detector and written to registers
PEAK_DET_STATL
and
PEAK_DET_STATR
. This value is used to implement Automatic Overmodulation Detection via an
external I2C control.
Important
: Only the selection of the 50 kHz FM deviation standard is compatible with the other DK-
A2* standards (DK1, DK2 or DK3). These standards must be removed from the list of standards
(registers
AUTO_SCKM
and
AUTO_SCKST
) when programming larger FM deviations reserved
only for DK-NICAM standards.
Table 3: Standards covered by the Automatic Standard Recognition System (AUTOSTD)
System
Sound Type
Type
Name
Carrier 1
(MHz)
Carrier 2
(MHz)
FM/AM Deviation
De-emphasis
Roll-
off
(%)
Pilot
Frequency
(kHz)
Min.
Typ.
Max.
M/N
FM Mono
4.5
15
27
50
75 μs
FM 2 Carriers
A2+
4.724
55.069
B/G
FM Mono
5.5
27
50
80
50 μs
FM/NICAM
5.850
J17
40
FM 2 Carriers
A2
5.742
50 μs
54.6875
I
FM Mono
6.0
27
50
80
50 μs
100
FM/NICAM
6.552
J17
100
L
AM Mono
6.5
0.5
1.0
AM/NICAM
5.850
J17
40
D/K
FM Mono
27
50
80
50 μs
FM/NICAM
5.850
J17
40
D/K1
FM 2 Carriers
A2*
6.258
50 μs
54.6875
D/K2
FM 2 Carriers
6.742
D/K3
FM 2 Carriers
5.742
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