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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: MyClasses/waveform_display.hpp
- Revision:
- 0:5c237fdcba23
diff -r 000000000000 -r 5c237fdcba23 MyClasses/waveform_display.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MyClasses/waveform_display.hpp Wed Dec 09 05:05:00 2015 +0000 @@ -0,0 +1,63 @@ +//----------------------------------------------------------- +// Class for waveform display +// +// 2015/12/07, Copyright (c) 2015 MIKAMI, Naoki +//----------------------------------------------------------- + +#ifndef F746_WAVEFORM_DISPLAY_HPP +#define F746_WAVEFORM_DISPLAY_HPP + +#include "mbed.h" + +namespace Mikami +{ + class WaveformDisplay + { + public: + WaveformDisplay(LCD_DISCO_F746NG &lcd, + uint16_t x0, uint16_t y0, int nData, + uint16_t rShift, + uint32_t axisColor, uint32_t lineColor, + uint32_t backColor) + : X0_(x0), Y0_(y0), N_DATA_(nData), R_SHIFT_(rShift), + AXIS_COLOR_(axisColor), LINE_COLOR_(lineColor), + BACK_COLOR_(backColor), lcd_(lcd) { Axis(); } + + void Execute(const int16_t xn[]) + { + Axis(); + lcd_.SetTextColor(LINE_COLOR_); + uint16_t x1 = X0_; + uint16_t y1 = Y0_ - (xn[0] >> R_SHIFT_); + for (int n=1; n<N_DATA_; n++) + { + uint16_t x2 = X0_ + n; + uint16_t y2 = Y0_ - (xn[n] >> R_SHIFT_); + lcd_.DrawLine(x1, y1, x2, y2); + x1 = x2; + y1 = y2; + } + } + + private: + const uint16_t X0_; + const uint16_t Y0_; + const int N_DATA_; + const uint16_t R_SHIFT_; + const uint32_t AXIS_COLOR_; + const uint32_t LINE_COLOR_; + const uint32_t BACK_COLOR_; + + LCD_DISCO_F746NG& lcd_; + + void Axis() + { + lcd_.SetTextColor(BACK_COLOR_); + lcd_.FillRect(X0_, Y0_-36, N_DATA_, 72); + + lcd_.SetTextColor(AXIS_COLOR_); + lcd_.DrawLine(X0_-5, Y0_, X0_+N_DATA_+5, Y0_); + } + }; +} +#endif // F746_WAVEFORM_DISPLAY_HPP \ No newline at end of file