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@0:5c237fdcba23, 2015-12-09 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Wed Dec 09 05:05:00 2015 +0000
- Revision:
- 0:5c237fdcba23
- Child:
- 1:1656f55c2d5c
1
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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MikamiUitOpen | 0:5c237fdcba23 | 1 | //----------------------------------------------------------- |
MikamiUitOpen | 0:5c237fdcba23 | 2 | // Realtime spectrum analyzer |
MikamiUitOpen | 0:5c237fdcba23 | 3 | // Input: A0 (CN5) |
MikamiUitOpen | 0:5c237fdcba23 | 4 | // |
MikamiUitOpen | 0:5c237fdcba23 | 5 | // 2015/12/09, Copyright (c) 2015 MIKAMI, Naoki |
MikamiUitOpen | 0:5c237fdcba23 | 6 | //----------------------------------------------------------- |
MikamiUitOpen | 0:5c237fdcba23 | 7 | |
MikamiUitOpen | 0:5c237fdcba23 | 8 | #include "button_group.hpp" |
MikamiUitOpen | 0:5c237fdcba23 | 9 | #include "sampler.hpp" |
MikamiUitOpen | 0:5c237fdcba23 | 10 | #include "waveform_display.hpp" |
MikamiUitOpen | 0:5c237fdcba23 | 11 | #include "AnalysisSelector.hpp" |
MikamiUitOpen | 0:5c237fdcba23 | 12 | |
MikamiUitOpen | 0:5c237fdcba23 | 13 | using namespace Mikami; |
MikamiUitOpen | 0:5c237fdcba23 | 14 | |
MikamiUitOpen | 0:5c237fdcba23 | 15 | const int N_DATA_ = 260; |
MikamiUitOpen | 0:5c237fdcba23 | 16 | |
MikamiUitOpen | 0:5c237fdcba23 | 17 | Ticker timer_; // for timer interrupt |
MikamiUitOpen | 0:5c237fdcba23 | 18 | Sampler input_(A0, timer_, N_DATA_); |
MikamiUitOpen | 0:5c237fdcba23 | 19 | |
MikamiUitOpen | 0:5c237fdcba23 | 20 | // Interrupt service routine for timer |
MikamiUitOpen | 0:5c237fdcba23 | 21 | void TimerIsr() |
MikamiUitOpen | 0:5c237fdcba23 | 22 | { |
MikamiUitOpen | 0:5c237fdcba23 | 23 | input_.Execute(); |
MikamiUitOpen | 0:5c237fdcba23 | 24 | } |
MikamiUitOpen | 0:5c237fdcba23 | 25 | |
MikamiUitOpen | 0:5c237fdcba23 | 26 | int main() |
MikamiUitOpen | 0:5c237fdcba23 | 27 | { |
MikamiUitOpen | 0:5c237fdcba23 | 28 | const int N_FFT = 512; // number of date for FFT |
MikamiUitOpen | 0:5c237fdcba23 | 29 | const int X_WAV = 44; // Origin for waveform of x axis |
MikamiUitOpen | 0:5c237fdcba23 | 30 | const int Y_WAV = 36; // Origin for waveform of y axis |
MikamiUitOpen | 0:5c237fdcba23 | 31 | const int X0 = 40; // Origin for spectrum of x axis |
MikamiUitOpen | 0:5c237fdcba23 | 32 | const int Y0 = 234; // Origin for spectrum of y axis |
MikamiUitOpen | 0:5c237fdcba23 | 33 | const float DB1 = 2.4f; // Pixels for 1 dB |
MikamiUitOpen | 0:5c237fdcba23 | 34 | const int BIN = 1; // Pixels per bin |
MikamiUitOpen | 0:5c237fdcba23 | 35 | const int W_DB = 60; // Width in dB to be displayed |
MikamiUitOpen | 0:5c237fdcba23 | 36 | const int X0_BUTTON = 340; // Origin for button of x axis |
MikamiUitOpen | 0:5c237fdcba23 | 37 | |
MikamiUitOpen | 0:5c237fdcba23 | 38 | const int FS = 10000; // Sampling frequency: 10 kHz |
MikamiUitOpen | 0:5c237fdcba23 | 39 | const int TS = 1000000/FS; // Sampling period: 100 micro sec. |
MikamiUitOpen | 0:5c237fdcba23 | 40 | |
MikamiUitOpen | 0:5c237fdcba23 | 41 | const uint32_t BACK_COLOR = 0xFF006A6C; // teal green |
MikamiUitOpen | 0:5c237fdcba23 | 42 | const uint32_t INACTIVE_COLOR = BACK_COLOR & 0xD0FFFFFF; |
MikamiUitOpen | 0:5c237fdcba23 | 43 | const uint32_t TOUCHED_COLOR = 0xFF7F7FFF; |
MikamiUitOpen | 0:5c237fdcba23 | 44 | const uint32_t ORIGINAL_COLOR = 0xFF0068B7; |
MikamiUitOpen | 0:5c237fdcba23 | 45 | const uint32_t INACTIVE_TEXT_COLOR = LCD_COLOR_GRAY; |
MikamiUitOpen | 0:5c237fdcba23 | 46 | const uint32_t AXIS_COLOR = 0xFFCCFFFF; |
MikamiUitOpen | 0:5c237fdcba23 | 47 | const uint32_t LINE_COLOR = LCD_COLOR_CYAN; |
MikamiUitOpen | 0:5c237fdcba23 | 48 | |
MikamiUitOpen | 0:5c237fdcba23 | 49 | LCD_DISCO_F746NG lcd; // Object for LCD display |
MikamiUitOpen | 0:5c237fdcba23 | 50 | TS_DISCO_F746NG ts; // Object for touch pannel |
MikamiUitOpen | 0:5c237fdcba23 | 51 | |
MikamiUitOpen | 0:5c237fdcba23 | 52 | lcd.Clear(BACK_COLOR); |
MikamiUitOpen | 0:5c237fdcba23 | 53 | |
MikamiUitOpen | 0:5c237fdcba23 | 54 | // Setting of button group |
MikamiUitOpen | 0:5c237fdcba23 | 55 | const string RUN_STOP[2] = {"RUN", "STOP"}; |
MikamiUitOpen | 0:5c237fdcba23 | 56 | ButtonGroup runStop(lcd, ts, X0_BUTTON, 10, 60, 40, |
MikamiUitOpen | 0:5c237fdcba23 | 57 | ORIGINAL_COLOR, BACK_COLOR, |
MikamiUitOpen | 0:5c237fdcba23 | 58 | 2, RUN_STOP, 5, 0, 2); |
MikamiUitOpen | 0:5c237fdcba23 | 59 | runStop.Draw(1, INACTIVE_COLOR, INACTIVE_TEXT_COLOR); |
MikamiUitOpen | 0:5c237fdcba23 | 60 | |
MikamiUitOpen | 0:5c237fdcba23 | 61 | const string NORM_INV[2] = {"NORM", "INV"}; |
MikamiUitOpen | 0:5c237fdcba23 | 62 | ButtonGroup normInv(lcd, ts, X0_BUTTON, 65, 60, 40, |
MikamiUitOpen | 0:5c237fdcba23 | 63 | ORIGINAL_COLOR, BACK_COLOR, |
MikamiUitOpen | 0:5c237fdcba23 | 64 | 2, NORM_INV, 5, 0, 2); |
MikamiUitOpen | 0:5c237fdcba23 | 65 | normInv.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); |
MikamiUitOpen | 0:5c237fdcba23 | 66 | |
MikamiUitOpen | 0:5c237fdcba23 | 67 | const string METHOD[3] = {"FFT", "Linear Pred.", "Cepstrum"}; |
MikamiUitOpen | 0:5c237fdcba23 | 68 | ButtonGroup method(lcd, ts, X0_BUTTON, 120, 125, 40, |
MikamiUitOpen | 0:5c237fdcba23 | 69 | ORIGINAL_COLOR, BACK_COLOR, |
MikamiUitOpen | 0:5c237fdcba23 | 70 | 3, METHOD, 0, 5, 1); |
MikamiUitOpen | 0:5c237fdcba23 | 71 | method.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); |
MikamiUitOpen | 0:5c237fdcba23 | 72 | // End of button group setting |
MikamiUitOpen | 0:5c237fdcba23 | 73 | |
MikamiUitOpen | 0:5c237fdcba23 | 74 | SpectrumDisplay disp(lcd, N_FFT, X0, Y0, DB1, BIN, W_DB, FS, |
MikamiUitOpen | 0:5c237fdcba23 | 75 | AXIS_COLOR, LINE_COLOR, BACK_COLOR); |
MikamiUitOpen | 0:5c237fdcba23 | 76 | // Linear prediction: order = 14 |
MikamiUitOpen | 0:5c237fdcba23 | 77 | // Cepstral smoothing: lifter length = 50 |
MikamiUitOpen | 0:5c237fdcba23 | 78 | Selector selector(disp, method, N_DATA_, N_FFT, 14, 50, |
MikamiUitOpen | 0:5c237fdcba23 | 79 | TOUCHED_COLOR); |
MikamiUitOpen | 0:5c237fdcba23 | 80 | |
MikamiUitOpen | 0:5c237fdcba23 | 81 | WaveformDisplay waveDisp(lcd, X_WAV, Y_WAV, N_DATA_, 10, |
MikamiUitOpen | 0:5c237fdcba23 | 82 | AXIS_COLOR, LINE_COLOR, BACK_COLOR); |
MikamiUitOpen | 0:5c237fdcba23 | 83 | |
MikamiUitOpen | 0:5c237fdcba23 | 84 | int16_t* sn; // pointer of data to be analyzed |
MikamiUitOpen | 0:5c237fdcba23 | 85 | bool runSelected = false; |
MikamiUitOpen | 0:5c237fdcba23 | 86 | int touchedNum = -1; |
MikamiUitOpen | 0:5c237fdcba23 | 87 | bool inv = false; |
MikamiUitOpen | 0:5c237fdcba23 | 88 | while (true) |
MikamiUitOpen | 0:5c237fdcba23 | 89 | { |
MikamiUitOpen | 0:5c237fdcba23 | 90 | if (!runSelected) |
MikamiUitOpen | 0:5c237fdcba23 | 91 | { |
MikamiUitOpen | 0:5c237fdcba23 | 92 | if (runStop.Touched(0, TOUCHED_COLOR)) |
MikamiUitOpen | 0:5c237fdcba23 | 93 | { |
MikamiUitOpen | 0:5c237fdcba23 | 94 | input_.ClearCount(); |
MikamiUitOpen | 0:5c237fdcba23 | 95 | timer_.attach_us(&TimerIsr, TS); // Enable timer interrupt |
MikamiUitOpen | 0:5c237fdcba23 | 96 | runSelected = true; |
MikamiUitOpen | 0:5c237fdcba23 | 97 | for (int n=0; n<3; n++) |
MikamiUitOpen | 0:5c237fdcba23 | 98 | if (n != touchedNum) method.Redraw(n); |
MikamiUitOpen | 0:5c237fdcba23 | 99 | } |
MikamiUitOpen | 0:5c237fdcba23 | 100 | int touchedNum2 = touchedNum; |
MikamiUitOpen | 0:5c237fdcba23 | 101 | method.GetTouchedNumber(touchedNum2); |
MikamiUitOpen | 0:5c237fdcba23 | 102 | if ( (touchedNum != -1) && (touchedNum != touchedNum2) ) |
MikamiUitOpen | 0:5c237fdcba23 | 103 | selector.Execute(sn, touchedNum); |
MikamiUitOpen | 0:5c237fdcba23 | 104 | } |
MikamiUitOpen | 0:5c237fdcba23 | 105 | |
MikamiUitOpen | 0:5c237fdcba23 | 106 | if (runSelected) |
MikamiUitOpen | 0:5c237fdcba23 | 107 | { |
MikamiUitOpen | 0:5c237fdcba23 | 108 | // "NORM" or "INV" |
MikamiUitOpen | 0:5c237fdcba23 | 109 | if (normInv.GetCurrentColor(0) == INACTIVE_COLOR) |
MikamiUitOpen | 0:5c237fdcba23 | 110 | { |
MikamiUitOpen | 0:5c237fdcba23 | 111 | for (int n=0; n<2; n++) normInv.Redraw(n); |
MikamiUitOpen | 0:5c237fdcba23 | 112 | if (!inv) |
MikamiUitOpen | 0:5c237fdcba23 | 113 | normInv.Draw(0, TOUCHED_COLOR); |
MikamiUitOpen | 0:5c237fdcba23 | 114 | else |
MikamiUitOpen | 0:5c237fdcba23 | 115 | normInv.Draw(1, TOUCHED_COLOR); |
MikamiUitOpen | 0:5c237fdcba23 | 116 | } |
MikamiUitOpen | 0:5c237fdcba23 | 117 | |
MikamiUitOpen | 0:5c237fdcba23 | 118 | int button; |
MikamiUitOpen | 0:5c237fdcba23 | 119 | if (normInv.GetTouchedNumber(button, TOUCHED_COLOR)) |
MikamiUitOpen | 0:5c237fdcba23 | 120 | { |
MikamiUitOpen | 0:5c237fdcba23 | 121 | if (button == 0) |
MikamiUitOpen | 0:5c237fdcba23 | 122 | inv = input_.InvertEnable(false); |
MikamiUitOpen | 0:5c237fdcba23 | 123 | else |
MikamiUitOpen | 0:5c237fdcba23 | 124 | inv = input_.InvertEnable(true); |
MikamiUitOpen | 0:5c237fdcba23 | 125 | } |
MikamiUitOpen | 0:5c237fdcba23 | 126 | |
MikamiUitOpen | 0:5c237fdcba23 | 127 | // If input buffer filled, start analysis |
MikamiUitOpen | 0:5c237fdcba23 | 128 | if (input_.Filled()) |
MikamiUitOpen | 0:5c237fdcba23 | 129 | { |
MikamiUitOpen | 0:5c237fdcba23 | 130 | sn = input_.Get(); |
MikamiUitOpen | 0:5c237fdcba23 | 131 | waveDisp.Execute(sn); |
MikamiUitOpen | 0:5c237fdcba23 | 132 | |
MikamiUitOpen | 0:5c237fdcba23 | 133 | selector.Execute(sn, touchedNum); // spectrum analysis and display |
MikamiUitOpen | 0:5c237fdcba23 | 134 | |
MikamiUitOpen | 0:5c237fdcba23 | 135 | // Check "STOP" button touched |
MikamiUitOpen | 0:5c237fdcba23 | 136 | if (runStop.Touched(1, TOUCHED_COLOR)) |
MikamiUitOpen | 0:5c237fdcba23 | 137 | { |
MikamiUitOpen | 0:5c237fdcba23 | 138 | timer_.detach(); // Disable timer interrupt |
MikamiUitOpen | 0:5c237fdcba23 | 139 | runSelected = false; |
MikamiUitOpen | 0:5c237fdcba23 | 140 | normInv.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); |
MikamiUitOpen | 0:5c237fdcba23 | 141 | } |
MikamiUitOpen | 0:5c237fdcba23 | 142 | |
MikamiUitOpen | 0:5c237fdcba23 | 143 | // Restart sampling |
MikamiUitOpen | 0:5c237fdcba23 | 144 | input_.Restart(); |
MikamiUitOpen | 0:5c237fdcba23 | 145 | timer_.attach_us(&TimerIsr, TS); // Enable timer interrupt |
MikamiUitOpen | 0:5c237fdcba23 | 146 | } |
MikamiUitOpen | 0:5c237fdcba23 | 147 | } |
MikamiUitOpen | 0:5c237fdcba23 | 148 | } |
MikamiUitOpen | 0:5c237fdcba23 | 149 | } |