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MSP3421G 参数 Datasheet PDF下载

MSP3421G图片预览
型号: MSP3421G
PDF下载: 下载PDF文件 查看货源
内容描述: 多标准音频处理器系列与虚拟杜比环绕声 [Multistandard Sound Processor Family with Virtual Dolby Surround]
分类和应用:
文件页数/大小: 102 页 / 1129 K
品牌: MICRONAS [ MICRONAS ]
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PRELIMINARY DATA SHEET  
MSP 34x1G  
2.2.3. Preprocessing of Demodulator Signals  
“Stereo or A” channel: Analog or digital mono  
sound, stereo if available. In case of bilingual broad-  
cast, it contains language A (on left and right).  
The NICAM signals must be processed by a deempha-  
sis filter and adjusted in level. The analog demodu-  
lated signals must be processed by a deemphasis fil-  
ter, adjusted in level, and dematrixed. The correct  
deemphasis filters are already selected by setting the  
standard in the STANDARD SELECT register. The  
level adjustment has to be done by means of the FM/  
AM and NICAM prescale registers. The necessary  
dematrix function depends on the selected sound stan-  
dard and the actual broadcasted sound mode (mono,  
stereo, or bilingual). It can be manually set by the FM  
Matrix Mode register or automatically set by the Auto-  
matic Sound Selection.  
“Stereo or B” channel: Analog or digital mono  
sound, stereo if available. In case of bilingual broad-  
cast, it contains language B (on left and right).  
Fig 2–2 shows the source channel assignment of the  
demodulated signals in case of manual mode. If man-  
ual mode is required, more information can be found in  
the section “Demodulator Source Channels in Manual  
Mode” on page 96. Fig 2–3 and Table 2–2 show the  
source channel assignment of the demodulated sig-  
nals in case of Automatic Sound Select mode for all  
sound standards.  
Note: The analog primary input channel contains the  
signal of the mono FM/AM carrier or the L+R signal of  
the MPX carrier. The secondary input channel contains  
the signal of the 2nd FM carrier, the LR signal of the  
MPX carrier, or the SAP signal.  
2.2.4. Automatic Sound Select  
In the Automatic Sound Select mode, the dematrix  
function is automatically selected based on the identifi-  
cation information in the STATUS register. No I2C  
interaction is necessary when the broadcasted sound  
mode changes (e.g. from mono to stereo).  
2.3. Preprocessing for SCART and  
I2S Input Signals  
The demodulator supports the identification check by  
switching between mono compatible standards (stan-  
dards that have the same FM mono carrier) automati-  
cally and non-audible. If B/G-FM or B/G-NICAM is  
selected, the MSP will switch between these stan-  
dards. The same action is performed for the stan-  
dards: D/K1-FM, D/K2-FM, and D/K-NICAM. Switching  
is only done in the absence of any stereo or bilingual  
identification. If identification is found, the MSP keeps  
the detected standard.  
The SCART and I2S inputs need only be adjusted in  
level by means of the SCART and I2S prescale regis-  
ters.  
LS Ch.  
Matrix  
primary  
channel  
FM/AM  
Prescale  
FM-Matrix  
FM/AM  
0
1
Output-Ch.  
Matrices  
must be set  
according  
the standard  
secondary  
channel  
In case of high bit-error rates, the MSP 34x1G auto-  
matically falls back from digital NICAM sound to ana-  
log FM or AM mono.  
NICAM A  
NICAM B  
NICAM  
NICAM  
(Stereo or A/B)  
Prescale  
SC2 Ch.  
Matrix  
Table 2–1 summarizes all actions that take place when  
Automatic Sound Select is switched on.  
Fig. 2–2: Source channel assignment of demodulated  
signals in Manual Mode  
To provide more flexibility, the Automatic Sound Select  
block prepares four different source channels of  
demodulated sound (Fig 2–3). By choosing one of the  
four demodulator channels, the preferred sound mode  
can be selected for each of the output channels (loud-  
speaker, headphone, etc.). This is done by means of  
the Source Select registers.  
LS Ch.  
Matrix  
primary  
channel  
FM/AM  
0
1
FM/AM  
Prescale  
secondary  
channel  
Automatic  
Sound  
Select  
Output-Ch.  
Matricesmust  
be set once to  
stereo  
Stereo or A/B  
The following source channels of demodulated sound  
are defined:  
NICAM A  
NICAM B  
NICAM  
Stereo or A  
Stereo or B  
3
4
“FM/AM” channel: Analog mono sound, stereo if  
available. In case of NICAM, analog mono only  
(FM or AM mono).  
Prescale  
SC2 Ch.  
Matrix  
Fig. 2–3: Source channel assignment of demodulated  
signals in Automatic Sound Select Mode  
“Stereo or A/B” channel: Analog or digital mono  
sound, stereo if available. In case of bilingual broad-  
cast, it contains both languages A (left) and B  
(right).  
MICRONAS INTERMETALL  
11