The link to the project is here:
How is it able to produce audible sound? I thought humans can only hear till 20KHz and as they age it decreases to 16KHz or even less. The person says the ultrasonic sound is demodulated by ear, is that possible?
How is it able to produce audible sound? I thought humans can only hear till 20KHz and as they age it decreases to 16KHz or even less. The person says the ultrasonic sound is demodulated by ear, is that possible?