Joel Murphy / Mbed 2 deprecated ADS_StreamRawData

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependencies:   mbed

Biquad_multiChan.h@0:675506e540be, 2015-03-23 (annotated)

Committer:
biomurph
Date:
Mon Mar 23 19:22:04 2015 +0000
Revision:
0:675506e540be
Publishing this old ADS1299 code for the first time!

Who changed what in which revision?

UserRevisionLine numberNew contents of line
biomurph 0:675506e540be 1 //
biomurph 0:675506e540be 2 // Biquad_multiChan.h
biomurph 0:675506e540be 3 //
biomurph 0:675506e540be 4 // Created by Nigel Redmon on 11/24/12
biomurph 0:675506e540be 5 // EarLevel Engineering: earlevel.com
biomurph 0:675506e540be 6 // Copyright 2012 Nigel Redmon
biomurph 0:675506e540be 7 //
biomurph 0:675506e540be 8 // For a complete explanation of the Biquad code:
biomurph 0:675506e540be 9 // http://www.earlevel.com/main/2012/11/25/biquad-c-source-code/
biomurph 0:675506e540be 10 //
biomurph 0:675506e540be 11 // License:
biomurph 0:675506e540be 12 //
biomurph 0:675506e540be 13 // This source code is provided as is, without warranty.
biomurph 0:675506e540be 14 // You may copy and distribute verbatim copies of this document.
biomurph 0:675506e540be 15 // You may modify and use this source code to create binary code
biomurph 0:675506e540be 16 // for your own purposes, free or commercial.
biomurph 0:675506e540be 17 //
biomurph 0:675506e540be 18 // Extended by Chip Audette (Nov 2013) to handle multiple channels of data
biomurph 0:675506e540be 19 // that are being filtered by the same coefficients
biomurph 0:675506e540be 20 //
biomurph 0:675506e540be 21
biomurph 0:675506e540be 22 #ifndef Biquad_multiChan_h
biomurph 0:675506e540be 23 #define Biquad_multiChan_h
biomurph 0:675506e540be 24
biomurph 0:675506e540be 25 enum {
biomurph 0:675506e540be 26 bq_type_lowpass = 0,
biomurph 0:675506e540be 27 bq_type_highpass,
biomurph 0:675506e540be 28 bq_type_bandpass,
biomurph 0:675506e540be 29 bq_type_notch,
biomurph 0:675506e540be 30 bq_type_peak,
biomurph 0:675506e540be 31 bq_type_lowshelf,
biomurph 0:675506e540be 32 bq_type_highshelf
biomurph 0:675506e540be 33 };
biomurph 0:675506e540be 34
biomurph 0:675506e540be 35 class Biquad_multiChan {
biomurph 0:675506e540be 36 public:
biomurph 0:675506e540be 37 //Biquad_multiChan();
biomurph 0:675506e540be 38 Biquad_multiChan(int Nchan, int type, double Fc, double Q, double peakGainDB);
biomurph 0:675506e540be 39 ~Biquad_multiChan();
biomurph 0:675506e540be 40 void setType(int type);
biomurph 0:675506e540be 41 void setQ(double Q);
biomurph 0:675506e540be 42 void setFc(double Fc);
biomurph 0:675506e540be 43 void setPeakGain(double peakGainDB);
biomurph 0:675506e540be 44 void setBiquad(int type, double Fc, double Q, double peakGain);
biomurph 0:675506e540be 45 float process(float in,int Ichan);
biomurph 0:675506e540be 46
biomurph 0:675506e540be 47 protected:
biomurph 0:675506e540be 48 void calcBiquad(void);
biomurph 0:675506e540be 49
biomurph 0:675506e540be 50 int Nchan;
biomurph 0:675506e540be 51 int type;
biomurph 0:675506e540be 52 double a0, a1, a2, b1, b2;
biomurph 0:675506e540be 53 double Fc, Q, peakGain;
biomurph 0:675506e540be 54 double *z1, *z2;
biomurph 0:675506e540be 55 };
biomurph 0:675506e540be 56
biomurph 0:675506e540be 57 inline float Biquad_multiChan::process(float in,int Ichan) {
biomurph 0:675506e540be 58 double out = in * a0 + z1[Ichan];
biomurph 0:675506e540be 59 z1[Ichan] = in * a1 + z2[Ichan] - b1 * out;
biomurph 0:675506e540be 60 z2[Ichan] = in * a2 - b2 * out;
biomurph 0:675506e540be 61 return out;
biomurph 0:675506e540be 62 }
biomurph 0:675506e540be 63
biomurph 0:675506e540be 64 #endif // Biquad_multiChan_h