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WM8944BECS/R 数据表(PDF) 34 Page - Cirrus Logic

部件名 WM8944BECS/R
功能描述  Mono Low-Power CODEC with Video Buffer
PDF  165 Pages
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制造商  CIRRUS [Cirrus Logic]
网页  http://www.cirrus.com
标志 CIRRUS - Cirrus Logic

WM8944BECS/R 数据表(HTML) 34 Page - Cirrus Logic

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WM8944B
34
Rev 4.3
5-NOTCH FILTER
3D surround
5-notch filter
DF1 filter
L/HPF
Signal Enhancement Block 1 (SE1)
The 5-notch filter is part of the SE1 block. This function allows up to 5 programmable frequency bands
to be attenuated. The frequency and width of each notch is configurable; the depth of the attenuation
may also be adjusted. The default setting is bypass (OFF).
The notch filters are enabled on the left and right channels using the SE1_NOTCH_L_ENA and
SE1_NOTCH_R_ENA register bits defined in Table 13. Note that, although the 5-notch filter can be
enabled on the left/right channels independently, the parameters that define the notch filters apply
equally to the left and right channels, when enabled.
The notch filter coefficients are programmed in registers R72 to R91. For the derivation of these
registers, refer to the configuration tools supplied with the WM8944B Evaluation Kit.
Note that the notch filters should not be configured for centre-frequencies below 120Hz. To apply
filtering at low frequencies, the SE1 High Pass Filter should be used.
Typical applications for the notch filters are filtering of fixed-frequency noise or resonances; these
might arise from a motor (eg. DSC zoom lens motor) or from characteristics of the application
housing. Example plots of the Notch filter response are shown in Figure 14.
Notch Response - Slave Mode - fc=1kHz, fb=1kHz Depth 0 to 100%
-100
+0
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
V
520
1.5k
550
600 650 700 750 800 850 900
1k
1.2k
Hz
T
Notch Response - Slave Mode - fc=1kHz, fb=100, 500, 1k, 5k, 10kHz -
Depth=100%
-100
+0
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
V
20
20k
50
100
200
500
1k
2k
5k
10k
Hz
T
T
1kHz notch, bandwidth 1kHz, depth 0% to 100% in 20% steps
1kHz notch, 100% depth, bandwidth 100Hz, 500Hz, 1kHz, 5kHz, 10kHz
Notch Response - Slave Mode - fc=200, 500, 1k, 2k, 5k, 10kHz, fb=fc/2,
Depth 100%
-100
+0
-90
-80
-70
-60
-50
-40
-30
-20
-10
d
B
V
100
20k
200
500
1k
2k
5k
10k
Hz
T
T
T
T
T
T
T
T
T
T
T
T
T
6 notches, bandwidth Fcentre/2, depth 100%
Figure 14 Notch Filter Responses



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