Can ordinary microphones be sensible to ultra sound.?

Question

is there any tools to create a track with ultrasonic tune in a pc ? and how will the media players respond to the ultrasonic tracks ?

Answer 1

Whilst most people cannot hear over about 18 or 20khz, they say that anectdotal evidence suggests that this sound above this level can be perceived or felt as a sensation rather than heard. Also very high intensity ultrasound can sometimes be heard by the ear and they call this ultrasonic hearing.

You could buy the microphone used in a sound level meter. You could buy it as a spare part. You would have to check the frequency range though. The best you could do is probably about 20khz. The brand CEL make one sensitive to 20khz.

You could also check in google under "ultrasonic transducer sensor", to find some companies, and then see if you can purchase only the sensor (receiver) without the transmitting part of the unit. You would have to also check the frequency range.

With the first part of your question. I have never composed music on a computer, however I'm sure you could find some software to do this. You will have to search around for some cheap software to compose music, and then email them to check frequency range. I see no reason why you could not find this, however you may find it difficult to get very high frequencies like over 25khz, because most software is probably not designed for this.

Also, I have heard that you can purchase ultrasonic music which is already composed, some people listen to it for relaxation. I tried to find ultrasonic music a while ago, as I heard about it and I wanted to try it out, unfortunately I found it a bit difficult to locate. Try google, there were a few small companies marketing it. Also, maybe you could email the producer of one of these cd's to see if they can recommend some software for you to compose your own tracks, they also may be able to recommend a playback device.

You would probably need a special unit to play it back as most speakers are only sensitive to 20khz. You may have to purchase an ultrasonic transducer to play it back. These can be difficult to find with a wide frequency range, so you can properly listen to the music. As you are looking for a wide frequency range, and you are probably looking for low power, and a more diffused sound rather than a directional narrow beam, I would recommend a ultrasonic transducer which is designed to play back bioacoustics and animal sounds, you can find one on google. Make sure you match the speaker to the recommend voltage amplifier - also check power level. Ultrasonic transducers tend to be quite high voltage. (Standard speakers can only take about 30-35volt, through a 100volt pa amp. This is a lot louder than a standard 5volt hifi amp. The 20khz filter in the amp would have to be removed)

With the other part of your question. I think standard CD's should be able to store sound up to about 35khz, but you should check this. I'm not sure about mp3 players, you could email the contact email on the website, of a company who makes them to check this.

I do not think standard headphones on a media player can handle true ultrasonic sound very well. Maybe they can go to 20khz, but the volume will probably go down a lot at about 15khz.

Answer 2

Since we cannot hear over the 22k range anything recorded above that range is not hear-able nor can it be emitted by most speakers. But once in the computer it is simply data.
Microphones are designed to recieve sound data most efficiently at a narrow range of frequencies. They can, of course, do a wide range but are not as efficient.
So why do you want this?