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Cutoff frequency variable LPF by IIR 6th-order Butterworth filter for ST Nucleo F401RE.
Dependencies: UIT_IIR_Filter UIT_ACM1602NI UITDSP_ADDA mbed UIT_AQM1602
Diff: main.cpp
- Revision:
- 4:460f2285dd87
- Parent:
- 3:4086d5ad6e7a
- Child:
- 5:b291c4653eb9
--- a/main.cpp Wed Nov 12 10:58:32 2014 +0000 +++ b/main.cpp Sat Nov 15 06:51:05 2014 +0000 @@ -3,7 +3,7 @@ // A0: Signal to be filtered // A2: Value which controls cutoff frequency // -// 2014/11/12, Copyright (c) 2014 MIKAMI, Naoki +// 2014/11/15, Copyright (c) 2014 MIKAMI, Naoki //-------------------------------------------------------------- #include "mbed.h" @@ -64,8 +64,8 @@ float fc1 = 0; while (true) { - // fc: cutoff frequency, 200 -- 1000 Hz - float fc = 800.0f*(a2_/4095.6f) + 200.0f; + // fc: cutoff frequency, 100 -- 2000 Hz + float fc = 1900.0f*(a2_/4095.6f) + 100.0f; if (sw1_ == 0) {