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Buzzer EVP


Andres Ramos

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I did another interesting experiment today. I used my Spica chaos electronic circuit and attached an electric buzzer to it. A buzzer mainly behaves like the oscillating relay in my VISPRE device. By tuning the chaos pattern and the current through the buzzer I could make it emitt snaring sounds with speech rhythms.

I could record and export some fairly good voices.

       

The setup is not the prototype of a working device, I see it more as a research project where I learned something from.

The buzzer is a mechanical device that is able to self oscillate because of positive feedback. If you excite it with random patterns mimicking speech in a way that self oscillation is short before to start, the tiniest energy fluctuation will kick in self oscillation with an exponentially rising signal ramp. In case of the buzzer it starts to snare.

It's this fragile state where pk modulation may control this transitional point of operation.

The second thing is an acoustical bandpass forming formants from the impulses. The voices I posted here still are sub optimum in terms of spectral composition. I am thinking of a set of tubes with different lengths and volumes resonating on the base frequencies of the human pharynx.

 

 

 

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14 minutes ago, Michael Lee said:

Ive been on a similar track lately. Have no clue why 🤪 20211127_153841.thumb.jpg.decd55a92110b2d3dcce7c8e55c40bad.jpg

Now wait! Are you applying the vibration of a blower to the strings of a guitar? How cool ist that? 😜😲

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8 hours ago, Michael Lee said:

Yes. Ill need to write a full post, to explain how I came up with the idea. I know, Im becoming so steampunk!🤠

I love it! Can't wait for some audios from your setup.

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Today I spent some time with putting different cardboards tubes over the randomly snaring buzzer in order to check the creation of formants.

Suddenly I got a very glottal sounding noise like "Aaaaaa" and I realized it came from a piece of cardboard touching loosely the vibrating buzzer. Thus it was a direct transmission of noise through dense matter and not air.

I modified the setup and conveyed the buzzer vibrations through a steel needle to a diaphragm fixed to the tube.

There are a lot of parameters to play with like the chaos pattern of the NE555 circuit and the current through the buzzer. There are literally endless modes possible. Still way to go.

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Try putting your hand over the tube, to get a "waah" sound, then if that works, figure out some sort of valve lid you could make, controlled by a second buzzer.  

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Yes Jeff. I think that clearly was Michaels point. I could construct a cardboard lid at the tube end that opens the tube more or less like the choke in a carburetor, controlled by a motor with another spica.

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This is a really cool and crazy idea the same time, Jeff!

The tube Arrangement reminds me of the old radial engines they used for those WW1 aircraft.

This really fuels my ideas. Thank you Jeff!

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Yes there are. I had a simple thought based on your idea. I could use a tube with a second diaphragm somewhere in the middle. Not really a diaphragm but more a loosely fixed piece of paper fitting into the tube. By blowing some air into the tube the diaphragm will flutter in the stream of air and thus closing and opening the connection to the second half of the tube randomly. The resonance frequency would follow accordingly.

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Some results from today gained from my new prototype with the Spica. The results are not better compared to those gained from my previous devices but I had some interesting insights. Good results were obtained if the system is at the rim of tube resonance and rather slowly excited by a beat frequency coming from the Spica circuit.

Id processed the signal with the lingua and lowered the voice pitch in Wavepad while keeping the formants.

       

 

 

 

 

 

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Your prototype sounds like it has a lot of protentional!   I hear a voice speaking the last couple seconds of the video.  It's not coming through your device,  but a voice the video camera is picking up.  Was someone nearby speaking,  or is that an EVP I hear? 

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19 hours ago, Sfay said:

Your prototype sounds like it has a lot of protentional!   I hear a voice speaking the last couple seconds of the video.  It's not coming through your device,  but a voice the video camera is picking up.  Was someone nearby speaking,  or is that an EVP I hear? 

No, i was alone in the room at that moment. Could well be. I occasionally pick up voices through the microphone.

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