Power Audio Edit

[Danel Potvin]

Im having an audio signal as input. Next, I'm performing an FFT (power spectrum). My task is to "delete" some frequencies which meet certain criteria (not discussed here). After that, I have to invert FFT back to a sound wave. I have the following questions:

- I've tried several methods, but the inverse FFT always results in nosense waveforms. They should look similar to the input. I guess I'm missing the Phase at the inverse transform? Also, the time-scale doesn't correspond with the input.

The basic FFT VI produces a complex array as output. All the other spectral VIs probably call FFT.vi internally. I would probably use the simple FFT VI because then I would know exactly how i was manipulating the output data.

As for the "correct" way to delete components, it may depend on the nature of the spectrum and exactly what you are doing with the results. Because of spectral leakage you may not be able to simply set certain amplitudes to zero. Setting the phase component to zero may result in a phase jump if the adjacent components are non-zero. It might be better to set the deleted components to values interpolated from data in nearby bins.

Can you tell us more about the original signal and about what you expect the output to look like? Is there a theoretical basis for what you want to do - in terms of the mechanism which generates the signal?

The goal is to analyze the sound of that spring and one part is to detect "hidden frequencies". Hidden means that because of the spectral constellation, the human hear can't distinguish them between more dominant frequencies. I want to identify these "hidden frequencies" and delete them, so that only the dominant frequencies remain.

I don't think I have to go into details about the theoretical background of the criteria of these hidden frequencies, but it may make a difference that the hidden frequencies lie very close to dominant frequencies. They are only a few Hertz apart.

In terms of the inverse FFT, see the attached screenshot of my current code (which produces garbage output). For a start, I just wanted to inverse FFT the input without deleting any frequencies. I'll try your hint with the complex output.

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Does anyone have some input as to why when importing my Stereo and 5.1 surround sound files they are displaying as Mono sound? Mpeg 2 files...Yes I have my Audio preferences set to 5.1 Surround Sound. But when importing files they only show up as mono sound.

There have been recent posts on the forum that some stereo audio play as mono in Vegas Pro 21 build 300. The workaround recommended was to go to Options/Preferences/File i/O (tab) and check 'Enable Legacy AVC decoding'. You'll be able to advise if this workaround also works for 5.1 audio.

Okay so I followed your instructions and yes this worked for stereo sound but unfortunately 5.1 surround sound still shows up as mono. I am working with build 300 and I'm really hoping they come up with a fix for 5.1 and even 7.1 surround sound. Do you happen to know the release date for build 300?

Please post Mediainfo report for your failing media. I'm not seeing an issue with Vegas Pro 21-300 on Windows 10 with the hardware in my signature. I am able to see multiple channels from these sources:

So I found the solution to this problem guys while using Vegas Pro Edit 21 this program doesn't support AC3 5.1 surround sound. You have to use the AAC codec in order to edit 5.1 surround sound...?

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