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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.
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.
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.
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.
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.
Great results Andres. I really liked the strong glottal output this device is emitting, and seems so full of promise as the source of pk modulation. I really admire your ingenuity in thinking of this method !!
Very interesting Andres. There is a rhythm of human speech in these audio clips and the possible communicator might be a male. But I am unable to differentiate the words and cannot confirm that the language is German. I will follow this experiment with the idea that it could later lead to the discovery of a new method of producing more recognizable electronic voices. I see that you try to create an artificial (human) larynx/pharyx - the same principle than in the seances, where spiritis are using the larynx of the trance medium in order to produce human speech. Good and unique idea which might lead to new discoveries !