MSP 44x8G
PRELIMINARY DATA SHEET
2.2.4. Automatic Sound Select
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
(see Section 6.).
In the Automatic Sound Select mode, the dematrix
function is automatically selected based on the identifi-
cation information in the STATUS register. No I2C inter-
action is necessary when the broadcasted sound
mode changes (e.g. from mono to stereo).
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 con-
tains the signal of the second FM carrier, the L−R sig-
nal of the MPX carrier, or the SAP signal.
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 standards:
D/K1-FM, D/K2-FM, and D/K-NICAM. Switching is only
done in the absence of any stereo or bilingual identifi-
cation. If identification is found, the MSP keeps the
detected standard.
LS Ch.
Matrix
primary
channel
FM/AM
Prescale
NICAM
FM/AM
0
1
secondary
channel
Output-Ch.
Matricesmust
besetonceto
stereo
Automatic
Sound
Select
Stereo or A/B
NICAM A
NICAM
Stereo or A
Stereo or B
3
4
SC2 Ch.
Matrix
Prescale
In case of high bit-error rates, the MSP 44x8G auto-
matically falls back from digital NICAM sound to ana-
log FM or AM mono.
Fig. 2–2: Source channel assignment of demodulated
signals in Automatic Sound Select Mode
Table 2–1 on page 11 summarizes all actions that take
place when Automatic Sound Select is switched on.
2.2.5. Manual Mode
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 by means of the Source Select regis-
ters, independent for all MSP-outputs.
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 80.
The following source channels of demodulated sound
are defined:
LS Ch.
Matrix
primary
channel
FM/AM
– “FM/AM” channel: Analog mono sound, stereo if
available. In case of NICAM, analog mono only
(FM or AM mono).
FM-Matrix
FM/AM
0
1
Output-Ch.
Matrices
must be set
according
the standard
secondary
channel
Prescale
– “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).
NICAM A
NICAM
NICAM
NICAM
(Stereo or A/B)
Prescale
SC2Ch.
Matrix
– “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).
Fig. 2–3: Source channel assignment of demodulated
signals in Manual Mode
– “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).
10
Micronas
MICRONAS [ MICRONAS ]
