How do I create a frequency waterfall plot from an impulse response?

2019 8 5
1 个回答
更新时间：2019 8 8
11 次查看（30 天）

0 个投票

Hi,
I am using the following code to plot magnitude from an impulse response. I would like to plot a waterfall showing amplitude over frequency over time, but I can't seem to make it work.
If anyone could suggest a solution that would be incredibly helpful.
Thanks
info = audioinfo('IR.wav');
Fs = 44100;
[y,Fs] = audioread('IR.wav');
t = 0:seconds(1/Fs):seconds(info.Duration);
t = t(1:end-1);
NFFT = length(y);
Y = fft(y,NFFT);
Fy = ((0:1/NFFT:1-1/NFFT)*Fs).';
magnitude = abs(Y);
dB_mag=mag2db(magnitude);
figure(1)
plot(Fy(1:NFFT/2),dB_mag(1:NFFT/2))

请先登录，再回答此问题。

回答（1 个）

Navya Seelam
Navya Seelam 2019-8-8

0 个投票

Use waterfall function to obtain waterfall plot.
t=0:1/Fs:info.Duration;
t= t(1:end-1)';
Z=[dB_mag(1:NFFT/2) Fy(1:NFFT/2) t1(1:NFFT/2)];
waterfall(Z)
However, the magnitude obtained from fft corresponds to a particular frequency and does not have any time stamp. So, the magnitude obtained from fft can be used to visualize amplitude over frequency but not amplitude over time or frequency over time.

类别

在 帮助中心 和 File Exchange 中查找有关 Fourier Analysis and Filtering 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by