Effect: Remove Vocals, aka "Karaoke"

Hi,

i wrote a new effect for the audio-lib. It removes the vocals from songs.
For some songs it work good, for others not. For a good effect, the vocals must be in the mid of both stereo-channels.

How does it work ?

Simple. It inverts the right channel and adds it to the left (the result is one mono channel - ideally, the vocals are the same on l+r and subtracting the values gives 0...).

Its the same way as the "Vocals Remover" in audacity works.

I added a enable(bool) function which enables or disables the effect.
That means, if you disable it, you can use the effect as a simple way to transform stereo to mono.

Link with additional example-sketch:
https://github.com/FrankBoesing/Teensy-Audio-Effect-Remove-Vocals

@Paul: it's MIT licence ;-)

Have fun,
Frank.

Recorded demo - mp3 here: https://drive.google.com/open?id=0Bx2Jw84lqebkTWFkN2I0ZHQ3OVU
Original here:https://www.pjrc.com/teensy/SDTEST1.WAV

Karaoke

Hi Frank B!
Great job, that's a clean implementation!

This is what I was able to concoct some time back, not as elegant, but good enough to impress my kids!
https://forum.pjrc.com/threads/24793-Audio-Library?p=48468&viewfull=1#post48468

Cheers,
Alfa66

oops..i did'nt know that this existed

Frank B said:

oops..i did'nt know that this existed

Click to expand...

Hey, no worries!
It turns out that we have both come up with something that maybe is not really needed - check this: http://www.pjrc.com/teensy/gui/?info=AudioEffectMidSide

Anyway (and off topic) what is the best way to display (oscillscope-like) the waveform in the audio buffer? Should I use queue?

Thanks!

PS Really appreciate your many contributions to the Audio Forum!

alfa66 said:

Anyway (and off topic) what is the best way to display (oscillscope-like) the waveform in the audio buffer? Should I use queue?

Click to expand...

Yes, the queue object is the best way to get access to the raw audio samples.

Maybe we should put that remove vocals example into the library, using the existing mid-side object. My understanding is vocal elimination usually also involves a lowpass and highpass filter, to keep the non-vocal frequencies and try to lessen any vocals that get through the first part.

Anyone want to give that a try? Would love to include a really good vocal eliminator example with the library.

@Paul, I don't know, and I'm not familar with the new USB Audio - is it possible to take USB-Input, apply the effect and send it back to the PC ?
Would be a great example with mid-side, with the filters added. (But it works OK without filters, too - did you hear the example ? (Post #2)).
Audacity uses no filters for this effect.

Frank B said:

@Paul, I don't know, and I'm not familar with the new USB Audio - is it possible to take USB-Input, apply the effect and send it back to the PC ?

Click to expand...

Yes.

However, the USB objects don't implement update responsibility, so at least 1 regular input or output must also be present.