20. The media system of claim 16 , wherein the controller element applies a combinational weighting of a Time of Flight (TOF) ultrasonic distance measurement corresponding to a coarse estimated location of the finger and a differential Time of Flight (dTOF) ultrasonic measurement corresponding to a relative displacement as the finger moves between a far distance and a close distance from the mobile device for supplying a media of an identified search string.
16. A media system on a mobile device, comprising a controller element that emits ultrasonic waveforms from ultrasonic transducers to reflect off a finger in a three-dimensional touchless sensing space; digitally samples the reflected ultrasonic waveforms off the finger to produce a sampled reflected ultrasonic waveform; tracks a relative location and movement of the finger in the three-dimensional ultrasonic sensing space from differential time of flight waveform analysis of the sampled reflected ultrasonic waveforms; suppressing a ringing portion of the emitted ultrasonic waveforms overlapping with the sampled reflected ultrasonic waveform; minimizing distortion with the tracking associated with ultrasonic transducer ring-down during generation of a high-resolution touchless finger signing; receives a search string from the touchless finger signing and having at least one alpha-numeric character produced therefrom, and searches for a media that corresponds to at least a portion of the search string, wherein the media is at least one among audio, image, video, and text.