FFT within a moving window of an audio signal

Question

Dong-uk Hyon 2018-4-5

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/392928-fft-within-a-moving-window-of-an-audio-signal

评论： Star Strider 2018-4-6

Mic Data.mat

I have amplitude-time data from a microphone (attached 'Mic Data.mat' file). This is data that was gathered with a sampling rate of 44100Hz, over the period of around 30.01 seconds (resulting in a total of 1323441 samples).

I would like to analyse this time-domain data in the frequency domain, therefore, will require an FFT. However, in order to get an understanding of how the frequency changes over time, I need to analyse the data in smaller frames, for example, every 441 samples (or every 1/10th of a second). This will hopefully produce around 3000 frames of frequency domain plots.

My thought process would be to create a loop, which will create a rectangular window of width 441, whilst padding all other values outside this window to 0. FFT will then be carried out for the samples within the window, producing an amplitude-frequency plot for frames 0-440. The next iteration will then carry out the same process for samples 441-881 etc.

I am struggling to get this down to code. Could anyone please guide me in the right direction?

All help is greatly appreciated.

Thanks in advance.