Method and apparatus to provide surroundings awareness using sound recognition
Surrounding awareness is provided using sound recognition by detecting sound, determining frequency components of the detected sound and comparing the frequency components of the detected sound to the frequency components of known sound sources. If the components of a known sound source are detected, the source of the sound is determined to be present. An appropriate warning or enunciation of the sound source is provided.
1. A method of detecting and warning of a nearby hazard, the method comprising:
determining a current location from a global positioning system;
comparing the current location with stored locations of predetermined hazardous locations;
determining if the current location is within a predetermined distance of a predetermined hazardous location;
if the current location is within the predetermined distance of a hazardous location, issuing an audible warning through an audio driver that a hazard is nearby;
if the current location is not within the predetermined distance of a hazardous location, then performing the steps of:
sampling audio frequency signals that are obtained from a microphone;
computing a Fast Fourier Transform of the sampled audio frequency signals to provide frequency domain representations of the sampled audio frequency signals;
determining from frequency domain representations of sampled audio frequency signals, whether a predetermined number of periodic signals are in predetermined frequency ranges, the predetermined frequency ranges corresponding to predetermined hazards;
if a predetermined number of periodic signals are within the predetermined frequency ranges, issuing an audible warning that a hazard is nearby.
2. The method of claim 1 , wherein the stored locations of predetermined hazardous locations comprise at least one of: a railroad track and a vehicular roadway; and wherein said sampled audio frequency signals are samples of audio frequency signals produced by at least one of: a train horn and vehicle traffic on a roadway.