The iPhone is the ultimate mobile gadget. So it better be adaptable to all the conditions. In the noise or in the silence.
Looks like Apple has been thinking about such a system since the launch of iPhone. The Apple patent application for a "Method and Apparatus for Using a Sound Sensor to Adjust the Audio Output for a Device", originally filed in July 17th, 220y7 has just went online at the US Patent & Trademark Office website.