Doubtful, any purpose built ultrasonic sensor will likely be running at much higher frequencies than you can play with via a standard audio chain. The Ping for

Doubtful, any purpose built ultrasonic sensor will likely be running at much higher frequencies than you can play with via a standard audio chain. The Ping for example runs at 40khz but the most you'll get out of a standard issue audio chain is ~20-24khz, depending on the corner frequency of the analog filters on the input / output and driver / mic response.