48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
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/* #ifndef _FFT_ANALYSER_H_INCLUDED */
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/* #define _FFT_ANALYSER_H_INCLUDED */
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#include <Arduino.h>
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/* #define ARM_MATH_CM0PLUS */
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/* #include <arm_math.h> */
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#include "AudioAnalyser.h"
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//CLASS
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class FFTAnalyser : public AudioAnalyser
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{
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public:
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FFTAnalyser(int bufferSize=512, int fftSize=512);
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~FFTAnalyser();
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bool configure(int sampleRate=40000);
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float getReading(int spectrum[], WeightingType weighting_type);
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float getReading(WeightingType weighting_type);
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bool bufferFilled();
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private:
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void weighting(void *inputBuffer, int inputSize, WeightingType weighting_type);
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void convert2DB(void *inputVector, void *outputVector, int vectorSize, int factor);
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double rms(void *inputBuffer, int inputSize, int typeRMS, int factor);
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void fft(void *inputBuffer, void* outputBuffer, int fftBufferSize);
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//BUFFER Sizes
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int _fftSize;
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int _bufferSize; //Already usable bufferSize
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int _bufferIndex;
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int _sampleRate;
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int _bitsPerSample;
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float _rmsSpecB;
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//BUFFERS
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void* _sampleBuffer;
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void* _fftBuffer;
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void* _spectrumBuffer;
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void* _spectrumBufferDB;
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//FFT
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arm_rfft_instance_q31 _S31;
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};
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/* #endif */
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