不韋 呂
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:
- 8:1f4bc859bc84
- Parent:
- 7:6598a9b70e5a
- Child:
- 9:99c55850cb41
--- a/main.cpp Sun Dec 20 13:38:22 2015 +0000
+++ b/main.cpp Mon Dec 28 08:20:34 2015 +0000
@@ -2,7 +2,7 @@
// Realtime spectrum analyzer
// Input: A0 (CN5)
//
-// 2015/12/20, Copyright (c) 2015 MIKAMI, Naoki
+// 2015/12/28, Copyright (c) 2015 MIKAMI, Naoki
//------------------------------------------------
#include "button_group.hpp"
@@ -13,20 +13,20 @@
int main()
{
- 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 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; // Width in dB to be displayed
- const int X0_BTN = 340; // Origin for button of x axis
+ const int W_DB = 60; // Range in dB to be displayed
+ const int X0_BTN = 340; // Holizontal position for left of buttons
const int FS = 10000; // Sampling frequency: 10 kHz
- const uint32_t BACK_COLOR = 0xFF006A6C; // teal green
+ 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;
@@ -37,7 +37,7 @@
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
+ int16_t* sn = input.Get(); // Input data
lcd.Clear(BACK_COLOR);
@@ -68,7 +68,7 @@
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,
+ Selector analyzer(disp, method, N_DATA, N_FFT, 14, 50,
TOUCHED_COLOR);
// Wait for "RUN" button touched
@@ -84,12 +84,12 @@
{
if (runStop.Touched(0, TOUCHED_COLOR))
{
- input.Start();
+ input.Start(inv == 1);
normInv.Draw(inv, TOUCHED_COLOR);
normInv.Redraw(1-inv);
}
if (method.GetTouchedNumber(select, TOUCHED_COLOR))
- selector.Execute(sn, select);
+ analyzer.Execute(sn, select);
}
if (runStop.GetCurrentColor(0) == TOUCHED_COLOR)
@@ -99,17 +99,16 @@
if (input.Filled())
{
// Restart
- input.InvertEnable(inv == 1);
- input.Start();
+ input.Start(inv == 1);
// Waveform display
waveDisp.Execute(sn);
// Spectrum analysis and display
- selector.Execute(sn, select);
+ analyzer.Execute(sn, select);
}
else
if (method.GetTouchedNumber(select, TOUCHED_COLOR))
- selector.Execute(sn, select);
+ analyzer.Execute(sn, select);
// Check "STOP" button touched
if (runStop.Touched(1, TOUCHED_COLOR))