Device and method for detecting occurrence of wheeze
First Claim
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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Abstract
A device for detecting occurrence of wheeze in a lung sound includes an acoustic processing unit, a filtering unit, and an identifying unit. The acoustic processing unit is for obtaining a lung sound and for generating a raw sound signal accordingly. The filtering unit is for filtering the raw sound signal to obtain a filtered signal. The filtered signal has a plurality of sections with respect to the time domain. The identifying unit is for computing an energy value of each of the sections of the filtered signal, and for determining that a wheeze occurs when the energy values of a part of the sections are larger than a predetermined value and duration of the part of the sections is longer than a predetermined observation time.
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Citations
15 Claims
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1. A device for detecting occurrence of wheeze in a lung sound, said device comprising:
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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 includes a 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, and a second filter set having a 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, and a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for detecting an occurrence of a wheeze in a lung sound, said method to be implemented by a detecting device, said method comprising the following steps of:
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A) configuring the detecting device to obtain a lung sound and to generate a raw sound signal in time domain accordingly; B) configuring the detecting device to filter the raw sound signal to obtain a filtered signal within a specific frequency bandwidth, the filtered signals having a plurality of sections with respect to the time domain; C) configuring the detecting device to compute an energy value of each of the plurality of the sections of the filtered signal; and D) configuring the detecting device to determine that the 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 the time domain; wherein the detecting device includes a plurality of biorthogonal wavelet filter banks connected in series, and each of the plurality of the biorthogonal wavelet filter banks 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 includes a 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, and a second filter set having a 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, and a 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. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification