microphone_feedback3

thank you ! thats what I was looking for..:-)

Hi zerolagtime, thanks for replying to my question! Thanks for letting me know also that such a low frequency occurs in a big room like that. I was indeed interested in whether such a low frequency feedback could actually occur in a real setting or whether it was only something that you could accomplish with an artificial pitch shift. It sounded realistic, so I had a feeling that such a thing could be true, but now I know :)

I used audacity to modify the original sound in case someone such as yourself found a lower pitch more effective for their project. I have experienced feedback in real settings at a variety of pitches. The shape of the room, microphone, amplifier, and speakers change the oscillating frequency of any particular setup. My rig that I used to create this sound forced it to have a high pitch, which usually only happens with loud rock bands. Feedback during speaking in a big room with nice microphones usually sounds like the pitch above.

Not everyone can imagine the variation when listening to it here since they might not know that Audacity's built-in "Change Pitch" setting under "Effects" makes this easy.

Hopefully you'll play around in there and find other interesting effects that can help you tweak a sound to your purpose. Two of my favorites are "Noise Removal" and "Change Tempo," but moving over to Spectrogram view of a channel, combined with an equalizer (or a plugin effect called Notch Filter) are pretty handy too for constant tone hums or rings.

Many happy returns.
ZeroLagTime

I've got a question for you: When you say "low pitch shifted down," do you mean that you shifted the pitch down in an audio editor? Or was this the pitch of the original recording? Thanks :) and thanks for uploading these recordings - I'm finding them very useful for my purposes!