MATLAB function
便於畫出音訊圖於時域或頻域，也可以選擇要濾掉的頻率能量閥值

1. Plot signal wave in time or frequency domain
2. Choose x-axis as time or samples
3. Remove spectral energy under a value when show the spectrogram

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Plot Audio Wave in Time and Frequency domain
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Online Analysis For Audio Time & Frequency Domain

1、參數介紹

Required Input Parameters

  newFig      Create in a new figure window ( 0:No, 1:Yes )
  signal        Speech data
  fs                Sampling frequency (Hz)
  type           'time' or 'freq'

Optional Input Parameters

  x_axis              0: samples, 1: time
  name              Figure title
  removeFreq  Threshold for  spectral energy
  frame              Frame size for spectrogram (ms)

2、使用範例

% plotWave_YW(newFig, signal, fs, type, x_axis, name, removeFreq, frame)
% 先讀取音檔至clean以及其取樣率fs
% [ clean, fs ] = audioread( 'sp10.wav' );

Example 1

plotWave_YW(1, clean, fs, 'time', 0, 'clean speech');

1	開新figure視窗
clean	輸入音檔資料
fs	輸入取樣率
'time'	選擇時域
0	X軸為取樣點index
'clean speech'	圖的title

Example 2

plotWave_YW(1, clean, fs, 'time', 1, 'clean speech');

1	開新figure視窗
clean	輸入音檔資料
fs	輸入取樣率
'time'	選擇時域
1	X軸為時間
'clean speech'	圖的title

Example 3

plotWave_YW(1, clean, fs, 'freq', 1, 'clean speech');

1	開新figure視窗
clean	輸入音檔資料
fs	輸入取樣率
'freq'	選擇頻域
1	無影響
'clean speech'	圖的title

Example 4

plotWave_YW(1, clean, fs, 'freq', 1, 'clean speech',0);

1	開新figure視窗
clean	輸入音檔資料
fs	輸入取樣率
'freq'	選擇頻域
1	無影響
'clean speech'	圖的title
0	不顯示頻譜能量小於0的部份

Example 5

figure;
subplot(2,1,1);
plotWave_YW(0, clean, fs, 'time', 1, 'clean speech');
subplot(2,1,2);
plotWave_YW(0, clean, fs, 'freq', 1, 'clean speech');

0	不開新視窗，用於subplot