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ATR4258
A Multipath Noise Canceller (MNC) is implemented to reduce disturbance of the received signal
in multipath reception conditions. If the difference between the momentary and the averaged
field strength falls below a threshold adjustable by bit 81 to 84 (see Table 4-32 ), the MPX signal
may be muted and this situation (MPINT) can be signalized at pin 21 (INT) according to Table 4-
29 on page 17 . Muting of the MPX signal during multipath disturbances can be activated be set-
ting bit 8.
Table 4-31.
Multipath Noise Canceller
Multipath Noise Canceller
Active
Not active
Bit 8
0
1
Table 4-32.
Sensitivity of the MNC
Sensitivity MNC (Threshold)
Off
Low
...
(–33 dB)
...
Normal (–14 dB)
...
High (–9 dB)
Bit 84
0
0
...
0
...
0
...
1
Bit 83
0
0
...
0
...
1
...
1
Bit 82
0
0
...
1
...
1
...
1
Bit 81
0
1
...
1
...
1
...
1
Note:
Valid in FM or WB mode (bit 92 = 1)
The Multipath interrupt can also be switched on/off by bit 4.
Table 4-33.
Multipath Interrupt (MPINT)
MPINT (Pin 21)
Off
On (MPINT active)
Bit 4
0
1
19
4838B–AUDR–05/05
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