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PDF MSP3431G Data sheet ( Hoja de datos )
| Número de pieza | MSP3431G | |
| Descripción | (MSP34x1G) Multistandard Sound Processor Family | |
| Fabricantes | Micronas | |
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MICRONAS
INTERMETALL
PRELIMINARY DATA SHEET
MSP 34x1G
Multistandard
Sound Processor Family
with Virtual Dolby
Surround
Edition Oct. 15, 1999
6251-511-1PD
1 page  
www.DPaRtaESLhIMeeINt4AUR.cYomDATA SHEET
Contents, continued
Page
Section Title
99 7.
Appendix D: MSP 34x1G Version History
100 8.
Appendix E: Application Circuit
102 9.
Data Sheet History
MSP 34x1G
License Notice:
1) “Dolby”, “Virtual Dolby Surround”, and the double-D Symbol are trademarks of Dolby Laboratories.
Supply of this implementation of Dolby Technology does not convey a license nor imply a right under any patent, or
any other industrial or intellectual property right of Dolby Laboratories, to use this implementation in any finished
end-user or ready-to-use final product. Companies planning to use this implementation in products must obtain a
license from Dolby laboratories Licensing Corporation before designing such products.
MICRONAS INTERMETALL
5
5 Page 
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MSP 34x1G
2.2.3. Preprocessing of Demodulator Signals
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.
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).
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.
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.
Table 2–1 summarizes all actions that take place when
Automatic Sound Select is switched on.
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.
The following source channels of demodulated sound
are defined:
– “FM/AM” channel: Analog mono sound, stereo if
available. In case of NICAM, analog mono only
(FM or AM mono).
– “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).
– “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).
– “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 L−R signal of the
MPX carrier, or the SAP signal.
2.3. Preprocessing for SCART and
I2S Input Signals
The SCART and I2S inputs need only be adjusted in
level by means of the SCART and I2S prescale regis-
ters.
primary
channel
secondary
channel
FM/AM
Prescale
NICAM A
NICAM
NICAM B
Prescale
FM-Matrix
FM/AM 0
NICAM
(Stereo or A/B) 1
LS Ch.
Matrix
Output-Ch.
Matrices
must be set
according
the standard
SC2 Ch.
Matrix
Fig. 2–2: Source channel assignment of demodulated
signals in Manual Mode
primary
channel
secondary
channel
FM/AM
Prescale
NICAM A
NICAM
NICAM B
Prescale
FM/AM 0
Automatic
Sound
Select
Stereo or A/B 1
Stereo or A 3
Stereo or B 4
LS Ch.
Matrix
Output-Ch.
Matrices must
be set once to
stereo
SC2 Ch.
Matrix
Fig. 2–3: Source channel assignment of demodulated
signals in Automatic Sound Select Mode
MICRONAS INTERMETALL
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