Ultrasonic Sound

I am not sure I understand your proposed point. However, sound, particularly lower in the audible spectrum, requires a lot of energy to reproduce.

50% of the power in music is below 300 to 400 Hz. That means, for a normal SPL level you need half the amplifier's power to excite the mid bass and below.

Modulating an ultrasonic wave to produce enough mid and bass performance would require a huge amount of ultrasonic amplitude to be audible.

Then again, what you propose just sounds like low frequency AM radio, no?

This sounds a lot like the standard radio transmitter / receiver system except the transmission medium is operating on a different frequency. Yes I realise you are thinking about implementing it in a slightly different way, but isn't the end result the same (just more unproven and likely far more expensive, problematic and poorer sound reproduction).

Just saying.

A better solution may be to just increase the number of speakers so sound can be better directed and focused rather than blasting sound at high volume from a central point into a large crowd.

Color me skeptical. It's the "pea" that I can't see. Finding some way to convert ultrasonic energy into "sonic" energy doesn't seem possible without something other than mechanical conversion. But, I've seen revolutionary advances in materials and technology since I left the farm at 18, 56 years ago. So, nothing's impossible any more.

Will it clean my ring, too?

This time I do not want to explain the peasize detector. This might be patentable.

Every electronic circuit has theoretically its mechanical counterpart. A diode is a check valve, a resistor is a restriction to the flow, a capacitor is an emty hollow body with gas as a spring. And so on.

Take an old fashioned AM radio station. It uses say 700 Kc frequency modulated to the required audio frequencies, from 10 to 7000 Cycles. The modulation is as good and requires the same power at 10 or 7000 cycles.

Demodulating the 700 Kc can be made with very simple circuits, with a very small level of distorsion. The distorsion comes later from the following stages.

Now translate all this to a modulated 40 Kc sound vawe.

The demodulation or "detection" is performed inside the ear by the mechanical "pea"with exremely small distorsion. The power required in the "pea" can be extremely small too. No need for amplifying stages

I dissent from anonymous. I do not see why a 40 Kc ultrasound will need a lot of power to be modulated to say 0.1 cycles per second. You cam make this by hand increasing or decreasing the power to the ultrasound loudspeaker with a variable resistor.

Frankly, the only prolems I see with this system are what actually happens to portable FM receivers. They are strongly affected by wall reflexions and shades.

But again my question is: Has this been invented before?.

chorete

You wrote, "But again my question is: Has this been invented before?."

That is what a patent search is for.

You can do it yourself or hire a patent attorney.

My dear Hero.

I think you know that I may be nuts but not stupid.

I did an extensive search.

It is amazing how many inventions have been made in this field. Ultrasounds are used for nearly everything except possibly for what I propose.

I found about ten patents for modulated ultrasounds that are demodulated by nonlinearities of the air or by clothes or even the ear itself, so these ultrasounds are directly heard. These systems are in the Market but with no success. I ignore the reasons for this failure.

I asked my question because it seems very strange that such a simple idea has not been found before. Maybe it was and has some terrible drawback.

Thank you.

chorete

Thinking of this idea, it may be a really important invention that may change some aspects of everybody's life.

Take the Discos. Pepole really likes to be flooded with a heavy sound, but at the expense of disconfort for neighbors and for himself for not being able to keep a conversation with a nearby person. Using a "pea" inside only one ear he/she can feel the orgiastic effects of heavy sound but being capable of talkig softly to his/her companion. I realize that the psychological aspects of this strange phenomenon need to be researched.

chorete

Ultrasonic Pain Field Generators are used by police to disperse rioters.

You are creating a weapon.

Better make that a walnut: my son had to have an operation to remove a bead logged in his ear ..

Apart from that, why not give everyone an FM receiver?

Because the mobs at a concert don't go there for a thing in their ears, they go for the spectacle and the noise.

Also I would guess that aimed ultrasonic waves would be dangerous and may bounce unevenly among the crowds

I suggest that they take their open air concert outside the residential area, or bury the whole thing underground, same goes for the sports arenas! but who said that they really care how we feel? Noise pollution is not a great issue in this century: most people capacity to consider others to that extent has yet to evolve.

Don't you worry about the pea inside the ear. It is only a metaphor. I mean a well designed apparatus to be worn in an inobstrusive way in one ear, so as the person feels as if he/she were wearing nothing, so cheap that can be discarded, but able to flood the person in a high level high quality sound, while the other ear is let free for private conversation.

I am sure that young people facing the disjunctive of wearing the pea or being exited to the outskirts, would choose the pea.

I woul like to find some help here. There are excellent Technical Guys in the forum.

I know that there are very cheap modulated ultrasound speakers for pest control.

But they have an internal built in low frequency modulation. How can I disconnect it and connect a standard microphone instead?.

Thanks

chorete

I understand. But why not broadcast it FM into the pea, instead of reinventing the wheel? Why freak out every dog, possum, cat and horse within a mile? Also: what are the legal implications for a wearable gadget supplied by the organizers, if it caused any harm?

I still have my doubts about young concert goers, as well as artists and organisers accepting the solution. I think that blasting the sound where everyone has to listen to them is part of the fun, and the psychology behind it (for them).

On the other hand, if you just want to explore the problem for a purely technical exercise, or some other use, like the home for hearing impared; why not.

It is not my field, although it interest me.

I like many people go to concerts to feel the music, not so much to listen to it. There is a difference. It seems you don't understand this.

Yessir. I understand very well that most people that goes to these concerts like to feel the high volume sound in the belly.

I believe that Yesterday was the Gay Pride's Day. One of the largest celebrations in the World is usually held in the Center of Madrid,Spain. This year ALL the music has been banned. and there have nearly been riots.

I am talking about solutions to Real facts.

What woud you prefer. To have "pea" Music or NO music at all?.

I have the hunch that this system, if technicaly feasible, will have a lot of acceptance.

AS for the problem of Belly Music, may be we can invent a silent Belly Transducer.

chorete

I guess you have to compete with ear buds and iPods and FM radios, which have a commanding hold on the market.

What makes your idea a better mousetrap in the eyes of these consumers?

This is NOT a consumer artifact. And it has nothing to do with free Market

It is rather a fascist system, and its use would probably be forced by the City Authorities, democratic or not.

Personally I am really antagonist to any kind of Fascism.

But there are cases of extreme social controversy where the factual powers need to take sometimes hard decissions.

Consumers would'nt have any role in this situation.

The authorities in the case of the Gay Pride's Day in Madrid have installed an FM radio station only for this event.

But it has to be recognized that people in these events are highly drunk and drugged, and do not want to fiddle with Iphone or FM controls.

A small button in the ear would probably be acceptable.

Again: This idea does not contend against HiTech modern Gadgets. It is intended for only one SINGLE use: Noise control in mass events.

chorete

That would be a good example of government going amok - disregard a current and functional technology and invent a new one that is of inferior quality, but higher cost.

You can find better, but you won't pay more. ;-)

the radio channels for special events are at either end of the spectrum & quite easy to find

especially when many people in the area are already tuned in...

"Noise control in mass events".

You should post this idea to the website of the guy on the shield. See what he thinks about it.

Chorete, when was the last time you went to a real loud concert, like ACDC or .....

Invent a mechanism which can stop the world from spinning so you can get off.