MSP 34x2G
PRELIMINARY DATA SHEET
Individual configuration of the threshold can be done
using Table 6–5, whereby the bits 0 and 11 of
AUTO_FM are ignored. It is recommended to use the
internal setting used by the standard selection.
6.3.1.2. Function in Manual Mode
If the manual mode (MODUS[0]=0) is required, the
activation and configuration of the Automatic Switching
feature has to be done as described in Table 6–5.
Note, that the channel matrix of the corresponding out-
put channels must be set according to the
NICAM mode and need not to be changed in the FM/
AM-fallback case.
The optimum NICAM sound can be assigned to the
MSP output channels by selecting one of the “Stereo or
A/B”, “Stereo or A”, or “Stereo or B” source channels.
Example:
Required threshold = 500: bits [10:1]=00 1111 1010
Table 6–5: Coding of Automatic NICAM/Analog Sound Switching;
Reset Status: Mode 0;
Automatic Sound Select is on (MODUS[0] = 1)
Mode
Description
AUTO_FM [11:0]
ERROR_RATE- Source Select:
Threshold/dec
Addr. = 00 21
Input at NICAM Path1)
hex
1
Automatic Switching with
internal threshold
bit[11]
bit[10:1] = 0
= ignored
700
NICAM or FM/AM,
depending on
(Default, if Automatic Sound
Select is on)
bit[0]
= ignored
ERROR_RATE
2
Automatic Switching with
external threshold
(Customizing of Automatic
bit[11]
bit[10:1] = 25...1000
= threshold/2
= ignored
set by customer;
recommended
range: 50...2000
Sound Select)
bit[0]
= ignored
1)
The NICAM path may be assigned to “Stereo or A/B”, “Stereo or A”, or “Stereo or B” source channels
(see Table 2–2 on page 13).
Table 6–6: Coding of Automatic NICAM/Analog Sound Switching;
Reset Status: Mode 0;
Automatic Sound Select is off (MODUS[0] = 0)
Mode
Description
AUTO_FM [11:0]
ERROR_RATE- Source Select:
Addr. = 00 21
Threshold/dec
Input at NICAM Path
hex
0
Forced NICAM
bit[11]
= 0
none
always NICAM; Mute in
(Automatic Switching disabled)
bit[10:1] = 0
case of no NICAM available
bit[0]
= 0
= 0
1
2
3
Automatic Switching with
internal threshold
bit[11]
700
NICAM or FM/AM,
depending on
bit[10:1] = 0
(Default, if Automatic Sound
Select is on)
bit[0]
= 1
ERROR_RATE
Automatic Switching with
external threshold
(Customizing of Automatic
Sound Select)
bit[11]
bit[10:1] = 25...1000
= 0
set by customer;
recommended
range: 50...2000
= threshold/2
bit[0]
= 1
= 1
Forced Analog Mono
(Automatic Switching disabled)
bit[11]
bit[10:1] = 0
bit[0] = 1
none
always FM/AM
88
Micronas
MICRONAS [ MICRONAS ]
