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PDF MSP3460G Data sheet ( Hoja de datos )
| Número de pieza | MSP3460G | |
| Descripción | (MSP34x0G) Multistandard Sound Processor Family | |
| Fabricantes | Micronas | |
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MICRONAS
DATA SHEET
MSP 34x0G
Multistandard
Sound Processor Family
Edition May 27, 2003
6251-476-1DS
MICRONAS
1 page  
wwDwA.DTaAtaSSHhEeeEtT4U.com
Contents, continued
Page
Section Title
103 7.
Appendix C: Application Information
103 7.1. Phase Relationship of Analog Outputs
104 7.2. Application Circuit
105 8.
Appendix D: MSP 34x0G Version History
106 9.
Data Sheet History
MSP 34x0G
License Notice:
“Dolby Pro Logic” is a trademark 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 intellec-
tual 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
May 27, 2003; 6251-476-1DS
5
5 Page 
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MSP 34x0G
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 by the Automatic
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, D/K3-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 34x0G 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. 2–2). 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 and Table 2–2 show the source channel
assignment of the demodulated signals 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.
primary
channel
secondary
channel
NICAM A
FM/AM
Prescale
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.
Fig. 2–2: Source channel assignment of demodulated
signals in Automatic Sound Select Mode
2.2.5. Manual Mode
Fig. 2–3 shows the source channel assignment of
demodulated signals in case of manual mode. If man-
ual mode is required, more information can be found in
Section 6.7. “Demodulator Source Channels in Manual
Mode” on page 101.
primary
channel
secondary
channel
NICAM A
FM/AM
Prescale
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 to
the standard.
Fig. 2–3: Source channel assignment of demodulated
signals in Manual Mode
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.
Micronas
May 27, 2003; 6251-476-1DS
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