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:
- 7:6598a9b70e5a
- Parent:
- 6:b27ef8d98edc
- Child:
- 8:1f4bc859bc84
diff -r b27ef8d98edc -r 6598a9b70e5a main.cpp --- a/main.cpp Fri Dec 18 10:09:31 2015 +0000 +++ b/main.cpp Sun Dec 20 13:38:22 2015 +0000 @@ -2,7 +2,7 @@ // Realtime spectrum analyzer // Input: A0 (CN5) // -// 2015/12/18, Copyright (c) 2015 MIKAMI, Naoki +// 2015/12/20, Copyright (c) 2015 MIKAMI, Naoki //------------------------------------------------ #include "button_group.hpp" @@ -33,11 +33,11 @@ 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 - int16_t sn[N_DATA]; // input buffer - Sampler input(A0, FS, N_DATA, sn); // Object for sampling + + 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); @@ -69,55 +69,51 @@ // Linear prediction: order = 14 // Cepstral smoothing: lifter length = 50 Selector selector(disp, method, N_DATA, N_FFT, 14, 50, - TOUCHED_COLOR); + TOUCHED_COLOR); // Wait for "RUN" button touched while (!runStop.Touched(0)) {} + method.DrawAll(ORIGINAL_COLOR); // Start of spectrum analyzing int inv = 0; // 0: "NORM", 1: "INV" int select = -1; while (true) - { + { if (runStop.GetCurrentColor(0) != TOUCHED_COLOR) { if (runStop.Touched(0, TOUCHED_COLOR)) { - input.IntrEnable(); - for (int n=0; n<3; n++) - if (n != select) method.Redraw(n); + input.Start(); normInv.Draw(inv, TOUCHED_COLOR); normInv.Redraw(1-inv); } if (method.GetTouchedNumber(select, TOUCHED_COLOR)) selector.Execute(sn, select); } - + if (runStop.GetCurrentColor(0) == TOUCHED_COLOR) { normInv.GetTouchedNumber(inv, TOUCHED_COLOR); if (input.Filled()) { - waveDisp.Execute(sn); - - // spectrum analysis and display - selector.Execute(sn, select); + // Restart + input.InvertEnable(inv == 1); + input.Start(); - // Check "STOP" button touched - if (runStop.Touched(1, TOUCHED_COLOR)) - normInv.DrawAll(INACTIVE_COLOR, - INACTIVE_TEXT_COLOR); - else // Restart sampling - { - input.InvertEnable(inv == 1); - input.Restart(); - input.IntrEnable(); - } + // Waveform display + waveDisp.Execute(sn); + // Spectrum analysis and display + selector.Execute(sn, select); } else if (method.GetTouchedNumber(select, TOUCHED_COLOR)) selector.Execute(sn, select); + + // Check "STOP" button touched + if (runStop.Touched(1, TOUCHED_COLOR)) + normInv.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR); } } }