PEB3265 Infineon Technologies Corporation, PEB3265 Datasheet - Page 235

• Manufacturer Part Number: PEB3265
• Description: (PEB326x / PEB426x) Dual Channel Slicofi-2 / Slic Duslic
• Manufacturer: Infineon Technologies Corporation

Preliminary
Bit
Bit
DTMF Receiver Notch Filter Center Frequency:
NCF = 32768
0 Hz
The bytes are calculated as follows:
NCF-L = MOD (NCF,256) = NCF & 0x00FF
NCF-H = INT (NCF/256) = NCF >> 8
The echo of the dial tone can activate the double talk detection which means that the
DTMF tone will not be detected. Therefore a notchfilter can be programmed to filter out
the echo of the dialtone, because the frequency of the dialtone is known. The center
frequency and the bandwith of the notch filter can be programmed.
Data Sheet
32
33
H
H
f
NCF
DTMF-NCF-H DTMF Receiver Notch Filter Center
DTMF-NCF-L DTMF Receiver Notch Filter Center
7
7
2000 Hz
cos
æ
è
6
6
2
Frequency High Byte
Frequency Low Byte
f
--------------------- -
NCF
8000
Hz
5
5
SLICOFI-2x Command Structure and Programming
ö
= NCF-L + 256
4
4
235
NCF-H
NCF-L
3
3
NCF-H
2
2
DuSLIC-E/-E2/-P
1
1
2000-07-14
0
0
Y
Y