中文说明：本程序是一个用短时傅立叶变换实现的心音时间、频率分析
English Description：
This program is a heart sound time and frequency analysis realized by short time Fourier transform
Time and frequency analysis of heart sound based on short time Fourier transform
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中文说明：本程序是一个用短时傅立叶变换实现的心音时间、频率分析
English Description：
This program is a heart sound time and frequency analysis realized by short time Fourier transform