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
Diff: main.cpp
- Revision:
- 2:095b360e0f54
- Parent:
- 1:1656f55c2d5c
- Child:
- 3:7c26b701f363
--- a/main.cpp Thu Dec 10 04:56:04 2015 +0000 +++ b/main.cpp Sun Dec 13 07:20:14 2015 +0000 @@ -2,7 +2,7 @@ // Realtime spectrum analyzer // Input: A0 (CN5) // -// 2015/12/10, Copyright (c) 2015 MIKAMI, Naoki +// 2015/12/13, Copyright (c) 2015 MIKAMI, Naoki //----------------------------------------------------------- #include "button_group.hpp" @@ -12,31 +12,20 @@ using namespace Mikami; -const int N_DATA_ = 260; - -Ticker timer_; // for timer interrupt -Sampler input_(A0, timer_, N_DATA_); - -// Interrupt service routine for timer -void Isr() -{ - input_.Execute(); -} - int main() { - const int N_FFT = 512; // number of date for FFT - const int X_WAV = 44; // Origin for waveform of x axis - const int Y_WAV = 36; // Origin for waveform of y axis - const int X0 = 40; // Origin for spectrum of x axis - const int Y0 = 234; // Origin for spectrum of y axis - const float DB1 = 2.4f; // Pixels for 1 dB - const int BIN = 1; // Pixels per bin - const int W_DB = 60; // Width in dB to be displayed - const int X0_BUTTON = 340; // Origin for button of x axis + 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 waveform of x axis + const int Y_WAV = 36; // Origin for waveform of y axis + const int X0 = 40; // Origin for spectrum of x axis + const int Y0 = 234; // Origin for spectrum of y axis + const float DB1 = 2.4f; // Pixels for 1 dB + const int BIN = 1; // Pixels per bin + const int W_DB = 60; // Width in dB to be displayed + const int X0_BTN = 340; // Origin for button of x axis - const int FS = 10000; // Sampling frequency: 10 kHz - const int TS = 1000000/FS; // Sampling period: 100 micro sec. + const int FS = 10000; // Sampling frequency: 10 kHz const uint32_t BACK_COLOR = 0xFF006A6C; // teal green const uint32_t INACTIVE_COLOR = BACK_COLOR & 0xD0FFFFFF; @@ -46,101 +35,92 @@ 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 + 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 lcd.Clear(BACK_COLOR); // Setting of button group const string RUN_STOP[2] = {"RUN", "STOP"}; - ButtonGroup runStop(lcd, ts, X0_BUTTON, 10, 60, 40, + 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_BUTTON, 65, 60, 40, + 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_BUTTON, 120, 125, 40, + 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: lifter length = 50 - Selector selector(disp, method, N_DATA_, N_FFT, 14, 50, - TOUCHED_COLOR); + Selector selector(disp, method, N_DATA, N_FFT, 14, 50, + TOUCHED_COLOR); - WaveformDisplay waveDisp(lcd, X_WAV, Y_WAV, N_DATA_, 10, - AXIS_COLOR, LINE_COLOR, BACK_COLOR); - - int16_t* sn; // pointer of data to be analyzed - bool runSelected = false; - int touchedNum = -1; - bool inv = false; + // Wait for "RUN" button touched + while (!runStop.Touched(0)) {} + + // Start spectrum analyzing + int inv = 0; // 0: "NORM", 1: "INV" + int select = -1; while (true) { - if (!runSelected) + int16_t* sn; // pointer of data to be analyzed + + if (runStop.GetCurrentColor(0) != TOUCHED_COLOR) { if (runStop.Touched(0, TOUCHED_COLOR)) { - input_.ClearCount(); - timer_.attach_us(&Isr, TS); // Enable timer interrupt - runSelected = true; + input.IntrEnable(); for (int n=0; n<3; n++) - if (n != touchedNum) method.Redraw(n); + if (n != select) method.Redraw(n); + normInv.Draw(inv, TOUCHED_COLOR); + normInv.Redraw(1-inv); } - int touchedNum2 = touchedNum; - method.GetTouchedNumber(touchedNum2); - if ( (touchedNum != -1) && (touchedNum != touchedNum2) ) - selector.Execute(sn, touchedNum); + if (method.GetTouchedNumber(select, TOUCHED_COLOR)) + selector.Execute(sn, select); } - if (runSelected) + if (runStop.GetCurrentColor(0) == TOUCHED_COLOR) { - // "NORM" or "INV" - if (normInv.GetCurrentColor(0) == INACTIVE_COLOR) + normInv.GetTouchedNumber(inv, TOUCHED_COLOR); + + if (input.Filled()) { - for (int n=0; n<2; n++) normInv.Redraw(n); - if (!inv) - normInv.Draw(0, TOUCHED_COLOR); - else - normInv.Draw(1, TOUCHED_COLOR); - } - - int invButton; // 0: "NORM", 1: "INV" - normInv.GetTouchedNumber(invButton, TOUCHED_COLOR); - - // If input buffer filled, start analysis - if (input_.Filled()) - { - sn = input_.Get(); + sn = input.Get(); waveDisp.Execute(sn); // spectrum analysis and display - selector.Execute(sn, touchedNum); + selector.Execute(sn, select); // Check "STOP" button touched if (runStop.Touched(1, TOUCHED_COLOR)) + normInv.DrawAll(INACTIVE_COLOR, + INACTIVE_TEXT_COLOR); + else // Restart sampling { - timer_.detach(); // Disable timer interrupt - runSelected = false; - normInv.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); + input.InvertEnable(inv == 1); + input.Restart(); + input.IntrEnable(); } - - // Restart sampling - inv = (invButton == 0) ? input_.InvertEnable(false) - : input_.InvertEnable(true); - input_.Restart(); - timer_.attach_us(&Isr, TS); // Enable timer interrupt } + else + if (method.GetTouchedNumber(select, TOUCHED_COLOR)) + selector.Execute(sn, select); } } }