Plot Audio Wave in Time and Frequency domain by MATLAB

Tutorial #1

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Description

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

Online Version

Online Analysis For Audio Time & Frequency Domain

Function

plotWave_YW(newFig, signal, fs, type, x_axis, name, removeFreq, frame)

• 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)

Before plot the figure, read audio first.

[ clean, fs ] = audioread( 'sp10.wav' );

Example 1:

Show time domain with samples in x-axis.

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

Example 2:

Show time domain with time in x-axis.

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

Example 3:

Show frequency domain.

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

Example 4:

Show frequency domain but remove weak energy.

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

Example 5:

By using subplot.

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');

👉 Tutorial Outline 👈