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Topic: Frequency graph program (Read 6259 times) previous topic - next topic
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Frequency graph program

I'm looking for a (preferably free) program which can take an audio file and generate a frequency graph (not sure what they're called) like this

or a spectrum graph like this

Can anyone please help me out?

Frequency graph program

Reply #1 –
Quote
I'm looking for a (preferably free) program which can take an audio file and generate a frequency graph (not sure what they're called) like this
http://www.mp3-tech.org/tests/pm/RefCdAudio.gif
or a spectrum graph like this
http://www.mp3-tech.org/tests/pm/RefCdAudioS.gif
Can anyone please help me out?
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Give [a href="http://www.exactaudiocopy.de/]EAC[/url] & Audacity a try

Frequency graph program

Reply #2 –
Audacity will do the job just fine.

For a frequency analysis select a 20 second portion of waveform and go View->Plot Spectrum. For a spectral analysis, click the little black inverted triangle to the top left of the waveform (where the title of the file is displayed above "mono,22050Hz" etc) and select Spectrum from the drop down menu.

If you want to zoom in on the spectral analysis (to look for signs of MP3 compression etc.) it's best to zoom in before switching to spectral view. You can drag the bottom of the bar containing each waveform to resize and fill the whole window if preferred.

Frequency graph program

Reply #3 –
Quote
Audacity will do the job just fine.

For a frequency analysis select a 20 second portion of waveform and go View->Plot Spectrum. For a spectral analysis, click the little black inverted triangle to the top left of the waveform (where the title of the file is displayed above "mono,22050Hz" etc) and select Spectrum from the drop down menu.

If you want to zoom in on the spectral analysis (to look for signs of MP3 compression etc.) it's best to zoom in before switching to spectral view. You can drag the bottom of the bar containing each waveform to resize and fill the whole window if preferred.
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Thanks, is there anyway to do a frequency analysis for longer than 20 seconds?  And Audacity doesnt seem to work properly with AAC files.

Frequency graph program

Reply #4 –
Well, you can do 23.8 seconds if you like :-)

They've been promising FLAC support for ages but at the moment it's WAV/AIFF, MP3 and OGG Vorbis only. Any other formats'll have to go to WAV/AIFF first.

Frequency graph program

Reply #5 –
I use Sound Forge 7.0 (this was made by Sonic Foundry but now Sony)

Convert the AAC (or what ever) to .wav format, open it with SF and
click view>spectrum analysis.

I think there is a new (trial) version for download

goto http://www.sony.com/
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Frequency graph program

Reply #8 –
Another thought, don't most lossy audio formats work in frequency space? All the programs discussed so far would have to do an inverse fourier to get the waveform, and then do a fourier to get the spectrum. Making things a lot slower and losing precision. Is there a spectrum analyzer that works directly off the information in the file? I suspect the spectrum viz for winamp does this.

edit: I just now played with Cool Edit 2.1. It works alright... but the spectrum is only linear scale (the log/linear option is for energy). So I wouldn't recommend it. Don't know about the post-Sony version. I bet those screenshots in the OP were done with Cool Edit though.

Frequency graph program

Reply #9 –
Quote
I'm looking for a (preferably free) program which can take an audio file and generate a frequency graph (not sure what they're called) like this


first one is amplitude/noise-floor graph and the second one is a spectrogram. Try using Audacity most wave editors have some nice FFT visualizations for that. Follow the above links also. What do you plan on using the graphs for?
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