Jump to content
  • entries
    5
  • comments
    46
  • views
    568

Buzzer EVP


Andres Ramos

480 views

 Share

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.

 

 

 

 Share

23 Comments


Recommended Comments

  • Administrators
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? 😜😲

Link to comment
  • Administrators
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.

Link to comment
  • Administrators

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.

Link to comment

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.  

Link to comment

Yes, again good results Andres. I thought also that there needs to be two random processes occurring together. One is the gating of the base frequency, and the other is a bandpass modulation of some sort, so having the two working emulates more closely the process of human vocalisation.

Link to comment
  • Administrators

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.

Link to comment

I had a really crazy idea Andres, in regards to making the tube randomly change length - have a selection of varied length tubes arranged on a circular plinth, grouped in a circle and touching each other. The plinth has holes so all the tube openings are available underneath and are all flush to the base. The plinth revolves via a motor, and the circular axis of the group of tubes sits closely above a short tube that contains the diaphragm. Hence the effective working tube length is continually changing,and acting as a random band-pass filter would. I dont know if it would work, or whether there would be enough defined difference in resonances to produce a decent band-pass effect? Anyway, this mad idea might spur some related thoughts Andres.

Link to comment
  • Administrators

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!

Link to comment

In thinking about the practicality of the rotating turret of tubes, Andres, its probably too hard to implement. Another simpler idea I thought of was to emulate the vocal bandpass filter mechanical effect by the mouth throat, etc, by a single cavity that could have its volume altered by a motor somehow. Perhaps like a tuned port with a sliding piston? Dunno, I guess there are a lot of possibilities to implement this.

Link to comment
  • Administrators
18 hours ago, Dr Jeffers said:

In thinking about the practicality of the rotating turret of tubes, Andres, its probably too hard to implement. Another simpler idea I thought of was to emulate the vocal bandpass filter mechanical effect by the mouth throat, etc, by a single cavity that could have its volume altered by a motor somehow. Perhaps like a tuned port with a sliding piston? Dunno, I guess there are a lot of possibilities to implement this.

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.

Link to comment
  • Administrators

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.

       

 

 

 

 

 

Link to comment
  • Administrators

Here my new prototype. I found out that the steel needle conveying the sound to the diaphragm should touch the buzzer only very gently. So I made an adjustable assembly for it.

 

 

The settings are VERY delicate to do!!

Link to comment

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? 

Link to comment
  • Administrators
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.

Link to comment
Guest
Add a comment...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.