Line in audio input oscilloscope

Question

I'm trying to build oscilloscope using line in Audio input and do filtering on it. I'm using python and Ubuntu.

I am able to send input to computer and read from line in audio input and record and play it.

Now I want to filter a particular frequency sin wave input at 300 Hz. How do I do that digitally ?

My guess is to use some kind of frequency filter using Fourier transform but I'm not sure.

Any help in right direction will be helpful. Thanks

There are entire textbooks on signal processing, filtering and the Fourier transform. — hotpaw2, Oct 04 '15 at 20:35

score 2 · Answer 1 · edited May 23 '17 at 12:22

2

An answer was given for 500Hz with JavaScript here Detect audio frequency from microphone with node.js You can easily translate that to Python.

edited May 23 '17 at 12:22

Community

answered Oct 09 '15 at 22:03

David Jonsson

1 Answers1