Detecting user gestures with a personal mobile communication device
System and methods for recognizing user gestures by processing audio from a microphone in a personal mobile communication device (PMCD) are disclosed. One such method includes sensing audio using a microphone in the PMCD and detecting a user gesture from audio sensed by the microphone. One such system includes a microphone, memory for storing instructions, and a processor configured by the instructions to sense audio using the microphone and detecting user gestures from audio sensed by the microphone. Also disclosed is a computer-readable medium storing a computer program for use in a personal mobile communication device. The program comprises instructions to: sense audio using a microphone in the personal mobile communication device; record the audio sensed by the microphone; process the recorded audio to extract a feature; classify the feature of the recorded audio; and identify one of a plurality of user gesture types based on the classified feature.
1. A system for detecting user gestures with a personal mobile communication device, the system comprising:
a microphone;
memory for storing executable instructions; and
a processor configured by the executable instructions to:
sense audio using the microphone;
record the audio sensed by the microphone;
process the recorded audio;
detect a user gesture from the processed audio;
responsive to the detection of the user gesture, generate a programmatic event;
determine a gesture type by:
evaluating energy content of the recorded signal;
evaluating a spectral centroid of the recorded signal;
classifying the recorded signal; and
identifying the classified recorded signal as one of a plurality of user gesture types; and
detect user gestures from the audio sensed by the microphone by determining whether the total energy in the frame equals or exceeds the current threshold value for gesture detection.
2. A system for detecting user gestures with a personal mobile communication device, the system comprising:
a microphone;
memory for storing executable instructions; and
a processor configured by the executable instructions to:
sense audio using the microphone;
record the audio sensed by the microphone;
process the recorded audio;
detect a user gesture from the processed audio;
responsive to the detection of the user gesture, generate a programmatic event;
detect user gestures from audio sensed by the microphone; and
determine a gesture type by:
evaluating energy content of the recorded signal;
evaluating a spectral centroid of the recorded signal;
classifying the recorded signal; and
identifying the classified recorded signal as one of a plurality of user gesture types,
wherein the processor is further configured by the executable instructions to evaluate the energy content by:
calculating a total energy content of half-rectified samples of the frame;
updating a current value of the threshold for gesture detection by calculating a moving average of total energy content, wherein the moving average is calculated as the average of the total energy of the frame and total energies of a plurality of previous frames; and
replacing the current threshold value for gesture detection with the calculated moving average of total energy value.