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3.3.2 Moving-average filter

3.3.2 Moving-average filter. Moving-window averaging filter = Moving-average (MA) filter. 3.3.1 Synchronized average  Ensemble average. 3.3.2 Moving averaging  Temporal (time) average. Ergodic : Temporal statistics may be used instead of ensemble statistics. Signal flow graph.

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3.3.2 Moving-average filter

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  1. 3.3.2 Moving-average filter Moving-window averaging filter = Moving-average (MA) filter 3.3.1 Synchronized average  Ensemble average 3.3.2 Moving averaging  Temporal (time) average Ergodic : Temporal statistics may be used instead of ensemble statistics

  2. Signal flow graph Figure 3.15

  3. An example Figure 3.16

  4. Suitable for PCG and EMG Not suitable for ECG (attenuation not high enough) Figure 3.17 Magnitude and phase response of the Hanning filter

  5. Fs = 1 kHz Moving window Fs = 1 kHz

  6. M = 8 Fs = 1 kHz 60 Hz 500 Hz

  7. M = 26 60 Hz

  8. M=101 60 Hz

  9. Frequency response of MA 8, 26, 101

  10. Effect of N Fs = 1 kHz Original MA 8 MA 26 MA101

  11. Transfer function of MA8

  12. Transfer function of MA101

  13. Signal flow graph

  14. Estimation of signal frequency

  15. Figure 3.18

  16. Figure 3.19

  17. Figure 3.20

  18. Figure 3.21

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