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:
- 15:a490686fce1e
- Parent:
- 14:cd4534fb34e7
- Child:
- 17:b74b1d99a8c1
diff -r cd4534fb34e7 -r a490686fce1e main.cpp
--- a/main.cpp Fri Jan 01 05:32:58 2016 +0000
+++ b/main.cpp Sat Jan 02 13:32:35 2016 +0000
@@ -2,7 +2,7 @@
// Realtime spectrum analyzer
// Input: A0 (CN5)
//
-// 2016/01/01, Copyright (c) 2016 MIKAMI, Naoki
+// 2016/01/02, Copyright (c) 2016 MIKAMI, Naoki
//------------------------------------------------
#include "button_group.hpp"
@@ -13,8 +13,10 @@
int main()
{
+ const int FS = 10000; // Sampling frequency: 10 kHz
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
@@ -24,8 +26,6 @@
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 INACTIVE_COLOR = BACK_COLOR & 0xD0FFFFFF;
const uint32_t TOUCHED_COLOR = 0xFF7F7FFF;
@@ -77,18 +77,22 @@
method.DrawAll(ORIGINAL_COLOR);
int inv = 0; // 0: "NORM", 1: "INV"
int select = -1;
- int stop = 0;
while (true)
{
if (runStop.Touched(0))
+ {
input.Start(inv == 1);
+ normInv.Draw(inv, TOUCHED_COLOR);
+ normInv.Redraw(1-inv);
+ }
+
+ int stop;
runStop.GetTouchedNumber(stop, TOUCHED_COLOR);
if (stop == 0)
{
normInv.GetTouchedNumber(inv, TOUCHED_COLOR);
- normInv.Draw(inv, TOUCHED_COLOR);
- normInv.Redraw(1-inv);
+
if (input.Filled())
{
// Restart
@@ -105,9 +109,11 @@
}
else
{
- input.Stop(); // Stop timer interrupt
if (runStop.Touched(1))
+ {
+ input.Stop(); // Stop timer interrupt
normInv.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR);
+ }
if (method.GetTouchedNumber(select, TOUCHED_COLOR))
analyzer.Execute(sn, select);
}