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Device and method for detecting occurrence of wheeze

  • US 9,113,780 B2
  • Filed: 03/29/2012
  • Issued: 08/25/2015
  • Est. Priority Date: 03/29/2012
  • Status: Active Grant
First Claim
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1. A device for detecting occurrence of wheeze in a lung sound, said device comprising:

  • an acoustic processing unit for obtaining a lung sound and for generating a raw sound signal in time domain accordingly;

    a filtering unit for filtering the raw sound signal to obtain a filtered signal within a specific frequency bandwidth, the filtered signal having a plurality of sections with respect to the time domain; and

    an identifying unit for computing an energy value of each of the plurality of the sections of the filtered signal, and for determining that a wheeze occurs in the lung sound when energy values of a part of the plurality of the sections are larger than a predetermined value and duration of said part of the sections is longer than a predetermined observation time in time domain;

    wherein said filtering unit includes a plurality of biorthogonal wavelet filter banks connected in series, and each of the plurality of said biorthogonal wavelet filter banks of said filtering unit has a polyphase structure;

    wherein, in the polyphase structure, each of the plurality of said biorthogonal wavelet filter banks receives an input signal, divides the input signal into a first part and a second part, and includesa first filter set having a first high pass filter for filtering the first part of the input signal to output a first high-frequency signal, and a first low pass filter for filtering the first part of the input signal to output a first low-frequency signal, anda second filter set havinga second high pass filter for filtering the second part of the input signal to output a second high-frequency signal, the second high-frequency signal being combined with the first high-frequency signal to form a high-frequency synthesis signal, anda second low pass filter for filtering the second part of the input signal to output a second low-frequency signal, the second low-frequency signal being combined with the first low-frequency signal to form a low-frequency synthesis signal;

    wherein, the raw sound signal from said acoustic processing unit serves as the input signal of a first one of the plurality of said biorthogonal wavelet filter banks of said filtering unit, one of the high-frequency and the low-frequency synthesis signals outputted by a last one of the plurality of said biorthogonal wavelet filter banks serves as the filtered signal, and one of the high-frequency and the low-frequency synthesis signals outputted by one of the plurality of said biorthogonal wavelet filter banks serves as the input signal of a next one of the plurality of said biorthogonal wavelet filter banks immediately following said one of the plurality of said biorthogonal wavelet filter banks.

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