14. The system of claim 1 , wherein the operations further comprise: processing the received geotagged audio signals to exclude portions of the environmental audio that include voices of users of the multiple mobile devices.
14. The system of claim 1 , wherein the operations further comprise: processing the received geotagged audio signals to exclude portions of the environmental audio that include voices of users of the multiple mobile devices. 16. The system of claim 14 , wherein: the operations further comprise: defining an area surrounding the particular geographic location, selecting a plurality of noise models associated with geographic locations within the area from among the multiple noise models, and generating a weighted combination of the selected noise models; and the noise compensation is performed using the weighted combination of selected noise models.