[moved] circuit sense the inaudible frequency and convert it to audible voice

[eng H]

I need any one to help me.

to find circuit to sense the inaudible frequency and convert it to audible voice.

 

[barry]

Like, say convert 94 GHz to 20Hz? Or, maybe .0001Hz to 20Hz?

 

[BradtheRad]

There are circuits that detect ultrasonic sounds from bats and insects, and convert them to lower frequencies that humans can hear.

It is based on a concept called heterodyning.

This website tells about it:

http://www.durhambats.org.uk

 

[eng H]

Dear barry,
Dear BradtheRad,

Thank you for replying.

My question mean, if human has a problem in his voice -he can speak but no one can her hem- I want to design circuit put it on his throat to sense his non-hearing frequency and convert it to hearing voice.

Note:
- this circuit may convert this frequency to low voice then will enter it to amplifier to amplify this voice.

Could any one help me?

Thank you,

 

[barry]

I'm not aware of people who can produce sounds outside the frequency range of normal human hearing, but as Bradtherad noted, you can use a heterodyning method to shift the frequency.