Realtime spectrum analyzer. Using FFT, linear prediction, or cepstrum smoothing. Version using MEMS microphone and CODEC, named "F746_RealtimeSpectrumAnalyzer_MEMS_Mic" is registered. リアルタイム スペクトル解析器.解析の手法:FFT,線形予測法,ケプストラムによる平滑化の3種類.このプログラムの説明は,CQ出版社のインターフェース誌,2016年4月号に掲載.外付けのマイクまたは他の信号源等を A0 に接続する.線形予測法,ケプストラムは,スペクトル解析の対象を音声信号に想定してパラメータを設定している.MEMS マイクと CODEC を使ったバージョンを "F746_RealtimeSpectrumAnalyzer_MEMS_Mic" として登録.
Dependencies: BSP_DISCO_F746NG BUTTON_GROUP LCD_DISCO_F746NG TS_DISCO_F746NG UIT_FFT_Real mbed
main.cpp
- Committer:
- MikamiUitOpen
- Date:
- 2016-01-02
- Revision:
- 15:a490686fce1e
- Parent:
- 14:cd4534fb34e7
- Child:
- 17:b74b1d99a8c1
File content as of revision 15:a490686fce1e:
//------------------------------------------------ // Realtime spectrum analyzer // Input: A0 (CN5) // // 2016/01/02, Copyright (c) 2016 MIKAMI, Naoki //------------------------------------------------ #include "button_group.hpp" #include "Sampler.hpp" #include "WaveformDisplay.hpp" #include "AnalysisSelector.hpp" using namespace Mikami; int main() { const int FS = 10000; // Sampling frequency: 10 kHz const int N_DATA = 260; // Number of data to be analyzed const int N_FFT = 512; // Number of date for FFT const int X_WAV = 44; // Origin for x axis of waveform const int Y_WAV = 36; // Origin for y axis of waveform const int X0 = 40; // Origin for x axis of spectrum const int Y0 = 234; // Origin for y axis of spectrum const float DB1 = 2.4f; // Pixels for 1 dB const int BIN = 1; // Pixels per bin const int W_DB = 60; // Range in dB to be displayed const int X0_BTN = 340; // Holizontal position for left of buttons const uint32_t BACK_COLOR = 0xFF006A6C; // Teal green const uint32_t INACTIVE_COLOR = BACK_COLOR & 0xD0FFFFFF; const uint32_t TOUCHED_COLOR = 0xFF7F7FFF; const uint32_t ORIGINAL_COLOR = 0xFF0068B7; const uint32_t INACTIVE_TEXT_COLOR = LCD_COLOR_GRAY; const uint32_t AXIS_COLOR = 0xFFCCFFFF; const uint32_t LINE_COLOR = LCD_COLOR_CYAN; LCD_DISCO_F746NG lcd; // Object for LCD display TS_DISCO_F746NG ts; // Object for touch pannel Sampler input(A0, FS, N_DATA); // Object for sampling int16_t* sn = input.Get(); // Input data lcd.Clear(BACK_COLOR); // Setting of button group const string RUN_STOP[2] = {"RUN", "STOP"}; ButtonGroup runStop(lcd, ts, X0_BTN, 10, 60, 40, ORIGINAL_COLOR, BACK_COLOR, 2, RUN_STOP, 5, 0, 2); runStop.Draw(1, INACTIVE_COLOR, INACTIVE_TEXT_COLOR); const string NORM_INV[2] = {"NORM", "INV"}; ButtonGroup normInv(lcd, ts, X0_BTN, 65, 60, 40, ORIGINAL_COLOR, BACK_COLOR, 2, NORM_INV, 5, 0, 2); normInv.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); const string METHOD[3] = {"FFT", "Linear Pred.", "Cepstrum"}; ButtonGroup method(lcd, ts, X0_BTN, 120, 125, 40, ORIGINAL_COLOR, BACK_COLOR, 3, METHOD, 0, 5, 1); method.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); // End of button group setting WaveformDisplay waveDisp(lcd, X_WAV, Y_WAV, N_DATA, 10, AXIS_COLOR, LINE_COLOR, BACK_COLOR); SpectrumDisplay disp(lcd, N_FFT, X0, Y0, DB1, BIN, W_DB, FS, AXIS_COLOR, LINE_COLOR, BACK_COLOR); // Linear prediction: order = 14 // Cepstral smoothing: highest quefrency = 50 Selector analyzer(disp, N_DATA, N_FFT, 14, 50); // Wait for "RUN" button touched while (!runStop.Touched(0, TOUCHED_COLOR)) {} // Start of spectrum analyzing method.DrawAll(ORIGINAL_COLOR); int inv = 0; // 0: "NORM", 1: "INV" int select = -1; while (true) { if (runStop.Touched(0)) { input.Start(inv == 1); normInv.Draw(inv, TOUCHED_COLOR); normInv.Redraw(1-inv); } int stop; runStop.GetTouchedNumber(stop, TOUCHED_COLOR); if (stop == 0) { normInv.GetTouchedNumber(inv, TOUCHED_COLOR); if (input.Filled()) { // Restart input.Start(inv == 1); // Waveform display waveDisp.Execute(sn); // Spectrum analysis and display analyzer.Execute(sn, select); } else if (method.GetTouchedNumber(select, TOUCHED_COLOR)) analyzer.Execute(sn, select); } else { if (runStop.Touched(1)) { input.Stop(); // Stop timer interrupt normInv.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); } if (method.GetTouchedNumber(select, TOUCHED_COLOR)) analyzer.Execute(sn, select); } } }