Biological sound analyzing apparatus, biological sound analyzing method, computer program, and recording medium
A body sound analysis device includes: acquisition means ( 210, 220 ) that acquires information relating to a frequency corresponding to a prescribed feature of a spectrum of a body sound; shifting means ( 230 ) that shifts, according to the information relating to the frequency, a plurality of reference spectrums that are references for classifying body sounds, and acquires a frequency shift reference spectrum; and output means ( 240, 250 ) that outputs a ratio of a plurality of reference spectrums included in the body sounds on the basis of the body sounds and the frequency shift reference spectrum. According to this body sound analysis device, a plurality of types of sounds included in the body sounds can be favorably analyzed.
1. A biological sound analyzing apparatus comprising:
a biological sound sensor that obtains signals of biological sounds;
a frequency analyzer operatively connected to an output of the biological sound sensor and configured to obtain information regarding frequency corresponding to predetermined characteristics of a spectrum of biological sounds based on the signals of biological sounds obtained by the biological sound sensor;
a shifter operatively connected to an output of the frequency analyzer and configured to shift a plurality of reference spectrums, which reference spectrums are references for classifying the biological sounds contained in the spectrum of biological sounds, the shifting being in accordance with the information regarding the frequency corresponding to predetermined characteristics of the spectrum of biological sounds, and configured to thereby obtain frequency-shifted reference spectrums;
a calculator that calculates a ratio of each of a plurality of reference spectrums included in the spectrum of biological sounds based on the spectrum of the biological sounds as obtained from the frequency analyzer and the frequency-shifted reference spectrums; and
an output device configured to output the calculated ratio of each of the plurality of reference spectrums.
2. The biological sound analyzing apparatus according to claim 1 , wherein the biological sounds are breath sounds.
3. The biological sound analyzing apparatus according to claim 2 , wherein said outputting device uses non-negative approximation to calculate the ratio of each of the plurality of reference spectrums.
4. The biological sound analyzing apparatus according to claim 2 , further comprising a sound separator configured to separate the spectrum of the biological sounds into a plurality of spectrums, each of the plurality of spectrums respectively corresponding to the plurality of reference spectrums.
5. The biological sound analyzing apparatus according to claim 2 , wherein the plurality of reference spectrums include reference spectrums corresponding to adventitious sounds.
6. The biological sound analyzing apparatus according to claim 5 , wherein said outputting device uses non-negative approximation to calculate the ratio of each of the plurality of reference spectrums.
7. The biological sound analyzing apparatus according to claim 5 , further comprising a sound separator configured to separate the spectrum of the biological sounds into a plurality of spectrums, each of the plurality of spectrums respectively corresponding to the plurality of reference spectrums.
8. The biological sound analyzing apparatus according to claim 1 , wherein said outputting device uses non-negative approximation to calculate the ratio of each of the plurality of reference spectrums.
9. The biological sound analyzing apparatus according to claim 1 , further comprising a sound separator configured to separate the spectrum of the biological sounds into a plurality of image data spectrums, each of the plurality of image data spectrums respectively corresponding to one of the plurality of reference spectrums.
10. A biological sound analyzing method comprising steps of:
obtaining a spectrum of biological sounds;
obtaining information regarding frequency corresponding to predetermined characteristics of the obtained spectrum of biological sounds;
shifting a plurality of reference spectrums, which reference spectrums are references for classifying the biological sounds contained in the spectrum of biological sounds, the shifting being in accordance with the information regarding the frequency corresponding to predetermined characteristics of the spectrum of biological sounds, and thereby obtaining frequency-shifted reference spectrums;
calculating a ratio of each of a plurality of reference spectrums included in the spectrum of biological sounds based on the obtained spectrum of the biological sounds and the frequency-shifted reference spectrums; and
outputting the calculated ratio of each of the plurality of reference spectrums.
11. A non-transitory computer-readable medium on which is stored a program that, upon execution, causes a computer to perform steps of:
obtaining a spectrum of biological sounds;
obtaining information regarding frequency corresponding to predetermined characteristics of the obtained spectrum of biological sounds;
shifting a plurality of reference spectrums, which reference spectrums are references for classifying the biological sounds contained in the spectrum of biological sounds, the shifting being in accordance with the information regarding the frequency corresponding to predetermined characteristics of the spectrum of biological sounds, and thereby and obtaining frequency-shifted reference spectrums;
calculating a ratio of each of a plurality of reference spectrums included in the spectrum of biological sounds based on the obtained spectrum of the biological sounds and the frequency-shifted reference spectrums; and
outputting the calculated ratio of each of the plurality of reference spectrums.