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:
- 2:095b360e0f54
- Parent:
- 1:1656f55c2d5c
- Child:
- 3:7c26b701f363
--- a/main.cpp Thu Dec 10 04:56:04 2015 +0000
+++ b/main.cpp Sun Dec 13 07:20:14 2015 +0000
@@ -2,7 +2,7 @@
// Realtime spectrum analyzer
// Input: A0 (CN5)
//
-// 2015/12/10, Copyright (c) 2015 MIKAMI, Naoki
+// 2015/12/13, Copyright (c) 2015 MIKAMI, Naoki
//-----------------------------------------------------------
#include "button_group.hpp"
@@ -12,31 +12,20 @@
using namespace Mikami;
-const int N_DATA_ = 260;
-
-Ticker timer_; // for timer interrupt
-Sampler input_(A0, timer_, N_DATA_);
-
-// Interrupt service routine for timer
-void Isr()
-{
- input_.Execute();
-}
-
int main()
{
- 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 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_BUTTON = 340; // Origin for button of x 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 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 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 FS = 10000; // Sampling frequency: 10 kHz
- const int TS = 1000000/FS; // Sampling period: 100 micro sec.
+ const int FS = 10000; // Sampling frequency: 10 kHz
const uint32_t BACK_COLOR = 0xFF006A6C; // teal green
const uint32_t INACTIVE_COLOR = BACK_COLOR & 0xD0FFFFFF;
@@ -46,101 +35,92 @@
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
+ 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
lcd.Clear(BACK_COLOR);
// Setting of button group
const string RUN_STOP[2] = {"RUN", "STOP"};
- ButtonGroup runStop(lcd, ts, X0_BUTTON, 10, 60, 40,
+ ButtonGroup runStop(lcd, ts, X0_BTN, 10, 60, 40,
ORIGINAL_COLOR, BACK_COLOR,
2, RUN_STOP, 5, 0, 2);
runStop.Draw(1, INACTIVE_COLOR, INACTIVE_TEXT_COLOR);
const string NORM_INV[2] = {"NORM", "INV"};
- ButtonGroup normInv(lcd, ts, X0_BUTTON, 65, 60, 40,
+ ButtonGroup normInv(lcd, ts, X0_BTN, 65, 60, 40,
ORIGINAL_COLOR, BACK_COLOR,
2, NORM_INV, 5, 0, 2);
normInv.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR);
const string METHOD[3] = {"FFT", "Linear Pred.", "Cepstrum"};
- ButtonGroup method(lcd, ts, X0_BUTTON, 120, 125, 40,
+ ButtonGroup method(lcd, ts, X0_BTN, 120, 125, 40,
ORIGINAL_COLOR, BACK_COLOR,
3, METHOD, 0, 5, 1);
method.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR);
// End of button group setting
+ WaveformDisplay waveDisp(lcd, X_WAV, Y_WAV, N_DATA, 10,
+ AXIS_COLOR, LINE_COLOR, BACK_COLOR);
+
SpectrumDisplay disp(lcd, N_FFT, X0, Y0, DB1, BIN, W_DB, FS,
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,
- TOUCHED_COLOR);
+ Selector selector(disp, method, N_DATA, N_FFT, 14, 50,
+ TOUCHED_COLOR);
- WaveformDisplay waveDisp(lcd, X_WAV, Y_WAV, N_DATA_, 10,
- AXIS_COLOR, LINE_COLOR, BACK_COLOR);
-
- int16_t* sn; // pointer of data to be analyzed
- bool runSelected = false;
- int touchedNum = -1;
- bool inv = false;
+ // Wait for "RUN" button touched
+ while (!runStop.Touched(0)) {}
+
+ // Start spectrum analyzing
+ int inv = 0; // 0: "NORM", 1: "INV"
+ int select = -1;
while (true)
{
- if (!runSelected)
+ int16_t* sn; // pointer of data to be analyzed
+
+ if (runStop.GetCurrentColor(0) != TOUCHED_COLOR)
{
if (runStop.Touched(0, TOUCHED_COLOR))
{
- input_.ClearCount();
- timer_.attach_us(&Isr, TS); // Enable timer interrupt
- runSelected = true;
+ input.IntrEnable();
for (int n=0; n<3; n++)
- if (n != touchedNum) method.Redraw(n);
+ if (n != select) method.Redraw(n);
+ normInv.Draw(inv, TOUCHED_COLOR);
+ normInv.Redraw(1-inv);
}
- int touchedNum2 = touchedNum;
- method.GetTouchedNumber(touchedNum2);
- if ( (touchedNum != -1) && (touchedNum != touchedNum2) )
- selector.Execute(sn, touchedNum);
+ if (method.GetTouchedNumber(select, TOUCHED_COLOR))
+ selector.Execute(sn, select);
}
- if (runSelected)
+ if (runStop.GetCurrentColor(0) == TOUCHED_COLOR)
{
- // "NORM" or "INV"
- if (normInv.GetCurrentColor(0) == INACTIVE_COLOR)
+ normInv.GetTouchedNumber(inv, TOUCHED_COLOR);
+
+ if (input.Filled())
{
- for (int n=0; n<2; n++) normInv.Redraw(n);
- if (!inv)
- normInv.Draw(0, TOUCHED_COLOR);
- else
- normInv.Draw(1, TOUCHED_COLOR);
- }
-
- int invButton; // 0: "NORM", 1: "INV"
- normInv.GetTouchedNumber(invButton, TOUCHED_COLOR);
-
- // If input buffer filled, start analysis
- if (input_.Filled())
- {
- sn = input_.Get();
+ sn = input.Get();
waveDisp.Execute(sn);
// spectrum analysis and display
- selector.Execute(sn, touchedNum);
+ selector.Execute(sn, select);
// Check "STOP" button touched
if (runStop.Touched(1, TOUCHED_COLOR))
+ normInv.DrawAll(INACTIVE_COLOR,
+ INACTIVE_TEXT_COLOR);
+ else // Restart sampling
{
- timer_.detach(); // Disable timer interrupt
- runSelected = false;
- normInv.DrawAll(INACTIVE_COLOR, INACTIVE_TEXT_COLOR);
+ input.InvertEnable(inv == 1);
+ input.Restart();
+ input.IntrEnable();
}
-
- // Restart sampling
- inv = (invButton == 0) ? input_.InvertEnable(false)
- : input_.InvertEnable(true);
- input_.Restart();
- timer_.attach_us(&Isr, TS); // Enable timer interrupt
}
+ else
+ if (method.GetTouchedNumber(select, TOUCHED_COLOR))
+ selector.Execute(sn, select);
}
}
}