Time / Frequency Techniques for Signal Feature
نویسندگان
چکیده
A method for detecting linear chirps in audio signals is presented. It uses a complex uniform spaced lter bank as a basis for the detection. The lter bank has an eecient implementation, good frequency local-ization, and delivers magnitude and phase of the sub-band signals. The complex lter bank uses two parallel real valued lter banks, each with critical sampling and perfect reconstruction capability. Detection is accomplished via a template based thresholding scheme. Various templates are used to account for diiering amounts of linear chirp in the data sets. Experimental results using actual audio data are presented, which demonstrate the method is a useful tool for the detection of linear chirps in audio signals.
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