SDA9255 Datasheet, PDF (20/45 Pages) Siemens Semiconductor Group – SRC-Scan Rate Converter SDA9255

SDA 9255
Table 1
MDFORNR and Corresponding k-Factor
MDFORNR
0
1
2
3
k-Factor
NRKF0
NRKF1
NRKF2
NRKF3
Mode
Still
Quasi still
Quasi motion
Motion
For NRKF0 ... 3 values between 0 and 7 can be chosen. The following table shows the
theoretical amount of noise reduction dependent on the applied k-factor.
Table 2
Filter Coefficients Dependent on the k-Factor
k-Factor
0
1
2
3
4
5
6
7
Amount of NR
0 dB
1.1 dB
2.2 dB
3.4 dB
4.8 dB
6.4 dB
8.5 dB
11.8 dB
The subaddresses 04_H, 05_H and 06_H (MDNRTH0, MDNRTH1, MDNRTH2,
see description of I²C Bus) are used to align the motion detection for noise reduction
(MDFORNR). The sensitivity of the motion detection is influenced by changing the
threshold levels of the motion values. A rough block diagram of the motion detection for
noise reduction is shown below.
Semiconductor Group
18
1998-02-01