/* analyze_fft1024_F32.h Converted from Teensy I16 Audio Library * * Audio Library for Teensy 3.X * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com * * Development of this audio library was funded by PJRC.COM, LLC by sales of * Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop * open source software by purchasing Teensy or other PJRC products. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice, development funding notice, and this permission * notice shall be included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ /* Moved directly I16 to F32. Bob Larkin 16 Feb 2021 * Only Hann window for now. */ #ifndef analyze_fft1024_F32_h_ #define analyze_fft1024_F32_h_ #include "Arduino.h" #include "AudioStream_F32.h" #include "arm_math.h" #define FFT_RMS 0 #define FFT_POWER 1 #define FFT_DBFS 2 /* // windows.c extern "C" { extern const int16_t AudioWindowHanning1024[]; extern const int16_t AudioWindowBartlett1024[]; extern const int16_t AudioWindowBlackman1024[]; extern const int16_t AudioWindowFlattop1024[]; extern const int16_t AudioWindowBlackmanHarris1024[]; extern const int16_t AudioWindowNuttall1024[]; extern const int16_t AudioWindowBlackmanNuttall1024[]; extern const int16_t AudioWindowWelch1024[]; extern const int16_t AudioWindowHamming1024[]; extern const int16_t AudioWindowCosine1024[]; extern const int16_t AudioWindowTukey1024[]; ) */ class AudioAnalyzeFFT1024_F32 : public AudioStream_F32 { //GUI: inputs:1, outputs:0 //this line used for automatic generation of GUI node //GUI: shortName:AnalyzeFFT1024 public: AudioAnalyzeFFT1024_F32() : AudioStream_F32(1, inputQueueArray) { arm_cfft_radix4_init_f32(&fft_inst, 1024, 0, 1); useHanningWindow(); // Revisit this for more flexibility <<<<< } bool available() { if (outputflag == true) { outputflag = false; return true; } return false; } float read(unsigned int binNumber) { if (binNumber>511 || binNumber<0) return 0.0; return output[binNumber]; } float read(unsigned int binFirst, unsigned int binLast) { if (binFirst > binLast) { unsigned int tmp = binLast; binLast = binFirst; binFirst = tmp; } if (binFirst > 511) return 0.0; if (binLast > 511) binLast = 511; uint32_t sum = 0; do { sum += output[binFirst++]; } while (binFirst <= binLast); return (float)sum * (1.0 / 16384.0); } void useHanningWindow(void) { for (int i=0; i < 1024; i++) { // 2*PI/1023 = 0.006141921 window[i] = 0.5*(1.0 - cosf(0.006141921f*(float)i)); } } // void windowFunction(const float *w) { // window = w; // } void setOutputType(int _type) { outputType = _type; } virtual void update(void); float output[512]; private: // void init(void); float window[1024]; int doPrint = 0; audio_block_f32_t *blocklist[8]; float fft_buffer[2048]; uint8_t state = 0; bool outputflag = false; audio_block_f32_t *inputQueueArray[1]; arm_cfft_radix4_instance_f32 fft_inst; int outputType = FFT_RMS; //Same type as I16 version has }; #endif