Spirits:
My dear friends, it is customary to separate sound from image. Already, from the point of view of your biology, your eyes do not react in the same way to the sound vibrations that your eardrums can do, although they are also in contact with these in addition to the other luminous ones. In absolute terms, the two things converge towards a unity: transmission, or more exactly perception. Because for the transmission we suppose a time which is fundamentally useless for the mind.
Understand that your audiovisual technique only works on a certain scale and for a desired and determined space. The eyes and the ears are therefore two senses relating to transmission. We seek together to find here below the best way to make the contact most adequate to these notions heard.
However, you will have to reconsider your studies and try to match the video recordings with the audio ones. One will have to feed the other and vice versa. A theory that we have already tried to explain here with you. Sound can create an image and light can create sound in a native way, without any additional artifice. The separation of these two representations of the transmission will only be one in your future installation. The shape generator will induce a similar sound wobble, and the laser light will also transmit frequency modulation, like a carrier wave that we will know to be used. These guidelines come at the right time and will require further refinement.
Laurie:
Does anyone want to bounce off the intro?
Valérian:
Maybe I have a quick question, what do they call a sound sweep?
Spirits:
A multitude of sounds like the multiple geometric shapes that you generate. Each form will have its sound, we are not talking about frequency but about sound, like for example onomatopoeias.
Valérian:
What do I call « tab » in my profession?
The spirits:
But more successful, audible but rapid sounds such as fragments of voices. We know men who use voice synthesizers, some of us manage to grab hold of them and form sentences.
Valérian: Thank you.
Sébastien:
So here is the first question: so we carried out an optical assembly with the strioscopy, do you have any suggestions for improving it?
The spirits:
Yes of course, you will have to review the location of your lighting in order to accentuate the much too weak contrast. You will also have to change your filter, it is inadequate, generating
annihilating disturbances. It will also be necessary to consolidate « its perpendicular » and the solidity of the whole. But already we can more fully absorb the present fluctuations, we foresee a revealing future.
Sébastien:
Thank you, there is Pascal (in Duplex) who would like to pick up on the introduction: even if you have just told us about it, he would like to know what you mean by reconsidering our studies.
The spirits:
Adapting new devices.
Sébastien:
Here is the second question: It’s about the shape generator, I would like to know in which direction we could improve it at the moment, to know if it is more useful to increase the refresh speed, the size of the shapes, or the number of shapes displayed, and if it’s useful at this time.
The spirits:
We have just answered my friend, it should be enriched with an audio bank which will be diffused in amplification in the cell. Start improving it by changing the contrast, they will be white shapes on a black background since the base of the projected image will be a neutral black. You will also have to think of a fluctuation of random cycles much more adaptable to our influences. Assimilate all this with a device sensitive to atmospheric pressure.
Sébastien:
Very well thank you, I would like to bounce back .. Annick: what are these cycles?
Spirits:
What are you talking about?
Annick:
It concerns the cycles they have to adapt, by following your cycles, I don’t understand ..
Sébastien:
It means that they will try to adapt the way in which the shapes are generated randomly (Transform the digital random into analog random, sensitive to their influences.)
Spirits: Yes.
Valérian:
Will the atmospheric pressure sensor have to be put in the cell?
Spirits: Yes.
Sébastien:
A question from Pascal (In duplex) too, he asks what sensor sensitivity would it take?
Spirits:
As low as possible, we already suggested a stretched canvas, remember.
Sébastien:
I would also like to bounce back from it: For the sweeping if I understand correctly, we are going to broadcast lots of small sounds, fast and fast, through the cell to be used for audio messages, and not for the demonstration in the mist?
The spirits:
Yes, but the sound will influence the atmosphere and this one on the image.
Sébastien:
Very well thank you.
Laurie:
Next question?
Sébastien:
The next question is Valérian who will ask it, about the audio.
Valérian:
For the question I no longer think it is very useful but I will ask it anyway: The sound waves sent by the box help it to a manifestation or interference on the mist?
Laurie:
So they already answered, yes.
Valérian:
So for the second question, I was thinking of modifying the sound that is sent by the subwoofer by frequency modulation or other signals? But you seem to have answered the question, because you would have to use a lot of signals, a lot of small recorded sounds and send them to the cell …
Spirits:
What do you think is the usefulness of your « low reflex » speaker?
Valérian:
Is it to interfere with the satellite dish? And modulate the shape of the mist? Am I wrong ?
Spirits:
Yeah, so what matters to us is the low frequency rather than the speaker itself, you see?
Valérian:
So, the signal that we send for the moment is a signal at only one frequency, wouldn’t it be better
to send, either a pulse, to have a more frequency « band »? rich, or we do a frequency modulation over time, and in terms of interference, are we going to improve their qualities in terms of haze by doing this?
The spirits :
What must be understood is the interweaving of the elements between them, and not to create an uncontrolled support, that is to say outside the framework of what can be useful to us. The frequency can create an image, it is generally very high and thus can induce forms in the subtle matter. Low frequency can create a useful grid in the mist that can make it more visible to us. Try each time and in your investigations to understand that we are not seeing things from your space. We are much more sensitive to vibration, to frequency, than to a defined form in your macro world. The mist is perceptible to us atomically, in frequency, but its repercussion on our influences is only measurable through your senses. By creating a sonic grid in your mist,we can further correct our influences.
Valérian:
So what you want is that we succeed in making ultrasound at 8 Hz, or low frequencies?
Spirits: Yes.
Valérian:
So for that we will have to make interferences?
Spirits: Yes.
Valérian:
So typically we can take 92 Hz and 100 Hz and manage to have interference at 8 Hz? To give an example.
Spirits:
Go to work! (participants laugh)
Laurie:
Is it good Valérian? Go ahead, don’t hesitate ..
Spirits:
Remember that we move forward together and depending on your evolving understanding, we adjust the possible. There would be 1000 other ways, but we contrast the one that is most likely to be successful in your space-time perimeter.
Valérian:
Uh, one last little thing and I will stop bothering you: So if I vary a signal between 92 Hz and 100 hertz linearly in terms of frequency for example, at the beginning we start at 92 Hz and then end we end at 100 Hz, would that manage to generate interference of the order of 8 Hz?
Spirits:
Not really, you need a constant signal, here we prefer, and to do this, a constant frequency imprint which will be made visible on the mist. However, pay attention to the sound pressure and the fragility of your ears.
Laurie:
And don’t worry, Valérian, you don’t bother, you have to dig as much as possible so that you understand.
Valérian:
But then there is a problem which comes to me, it is about the coherence of the two sinusoidal signals which must be coherent to create interference?
Spirits:
But you will have the solution. First, you can act on the PVC pipe and make it vibrate at a frequency varying between 50 and 70 hertz.
Laurie:
Is it good?
Valérian: It’s good.
Sébastien:
That’s a lot of information.
Laurie: Indeed ..
Sébastien:
So there is Pascal (Duplex) who would have two questions where he wanted to bounce back: One about sound emissions, can we still emit infrasound, and what frequencies could be used so as not to interfere with people who might be unwell, according to a study he read.
Spirits:
The infrasound is useful yes for the chemistry of the whole, since the infrasound will act on the whole assembly. But these should not be amplified, and should also be fluctuating always according to and thanks to a pressure sensor.
Sébastien:
Very well, and suddenly here is his second question: The frequencies will be between 8 and 98 Hz in interference, so what about a sound source below and above the mist?
The spirits:
You will have to arrange yourself so that the mist is as closely as possible influenced by the
frequency. This will create shapes that you can observe with an adjustable strobe in frequency. Do you know the experience of Melde’s rope?
The participants: No.
Spirits: Yes Pascal.
Sébastien:
Pascal writes .. It tells him something ..
Valérian:
… Like a guitar string that will deform at a certain frequency, it vibrates in time but also in space if we observe it at a certain frequency, we will see that it is deformed .. .? …
Spirits:
Yes Valerian, if you generate a frequency of 50Hz in the mist and illuminate it with a strobe light at 50Hz frequency, you could faintly see a fixed shape in the mist, do you understand?
Valérian:
I was thinking of the same experience but with a camera, with a very large number of images per second, which would do the same thing ..?
Spirits:
Remember the most useful, the frequency will serve as an anchor.
Valérian:
Uh, one last thing, on the sound grid: I have more or less understood how to make the interference, so we will have to send two fixed frequencies to our speaker, but what is the grid size it would take for them? interference, I know it depends on the frequency of the interference, … (in full reflection) …. so uh, what would be the low frequency for the grid and that of the high frequencies for the sum of two frequencies what?
Spirits:
My friend, keep it simple, we will adapt.
Laurie: Annick ..
Annick:
Do you have any additional advice regarding lighting?
Spirits:
Yes, it is badly placed, or more exactly badly collimated.
Sébastien:
So we end with the last written question, even if we have certainly already had the answer to this one: Is the 25 Hz sound program that we are creating really useful for the video? Because we do not know if it really has a useful function for you at the moment, and the sound is also varying ..
Laurie:
Yes they already answered.
Spirits:
Have you read what we are trying to write with this man?
Laurie:
Another question?
No, in this case we thank you very much, we will reread it all and we will leave you the last word in conclusion, thank you very much.
The spirits:
Do not feel overwhelmed, you have understood the principle, the application will be done with joy and good humor, in any case this is a wish.
Sébastopol and Tardieu.