Rhonchus identification method based on frequency domain image processing
A recognition method and technology of dry rales, applied in speech analysis, instruments, etc., can solve problems such as being easily affected by the external environment
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[0033] Example: such as figure 1 As shown, a rale recognition method based on frequency domain image processing, including audio preprocessing, binarized frequency domain image generation, and feature extraction of dry rales; the whole method can be realized based on computer mathematical calculation software MATLAB.
[0034] The audio preprocessing operation flow includes the following steps:
[0035] 1) Read the audio file locally, and store the audio data in the memory in the form of a floating-point array;
[0036] There is a related audio reading function wavread in MATLAB, which can read audio files in wav format and convert the corresponding data into matrix arrays and store them in memory.
[0037] 2) Use high-pass filtering to filter out some external noise during recording;
[0038] 3) Use low-pass filtering to filter out the noise generated by folding distortion;
[0039] Due to the particularity of breath sound files, only any one of the two channels can be used...
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