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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8945ECS/R датащи(PDF) 34 Page - Wolfson Microelectronics plc |
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WM8945ECS/R датащи(HTML) 34 Page - Wolfson Microelectronics plc |
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34 / 169 page  WM8945 Production Data w PD, May 2011, Rev 4.1 34 5-NOTCH FILTER 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 using the SE1_NOTCH_L_ENA register bit defined in Table 13. For the derivation of the other associated registers, refer to the configuration tools supplied with the WM8945 Evaluation Kit. Typical applications for the notch filters are filtering of fixed-frequency noise or resonances; these might arise from a motor (e.g. DSC zoom lens motor) or from characteristics of the application housing. Example plots of the Notch filter response are shown in Figure 15. 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 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, 10kH z 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 5 notches, bandwidth Fcentre/2, depth 100% Figure 15 Notch Filter Responses |
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