Definition of Sound from ultrasound
Sound from ultrasound refers to the generation of audible sound from modulated ultrasound. Two distinct mechanisms have been demonstrated. In the first, modulated ultrasound propagates through a nonlinear medium, which acts as a passive demodulator, producing audible sound without an active element; This is the principle underlying parametric arrays. In the second, audible sound is created from modulated ultrasound which is demodulated with a mechanically driven structure periodically changing the impedance of the acousic path in the device. This is the principle underlying active modulation.
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Questions people ask
Real questions from the Stack Exchange community – follow a link to read the discussion.
- Is there an upper frequency limit to ultrasound? · Physics SE
- How can ultrasound hurt human ears if it is above audible range? · Physics SE
- Transfering data using ultrasound · Electronics SE
Further reading
- Biomedical Ultrasound · Wikibooks: Engineering Acoustics
Frequently asked questions
What is Sound from ultrasound?
Sound from ultrasound refers to the generation of audible sound from modulated ultrasound. Two distinct mechanisms have been demonstrated.