System and method of detecting and processing physiological sounds
View Patent ↗A system and method for detecting and processing physiological sounds. The method includes sensing physiological sounds to acquire analog physiological signals, where the acquired analog physiological signals corresponding to basic heart sounds and sounds of interest. A predetermined frequency range of the acquired analog physiological signals that encompasses the sounds of interest are amplified, where at least a portion of the predetermined frequency range is higher than another frequency range of the acquired analog physiological signals that encompasses the basic heart sounds.
1. An assembly for detecting and processing physiological heart sounds, comprising:
a sensor for sensing physiological heart sounds so as to acquire analog physiological signals;
an amplifier configured to amplify a first frequency range of said physiological signals to a first level and configured to amplify a second frequency range of said physiological signals to a second level, said second level being higher than said first level, the amplification of the signals in the second frequency range being substantially constant within the second frequency range, the amplification of the signals above the second frequency range declining with respect to frequency from the upper end of the second frequency range, said first frequency range of physiological signals including frequencies that correspond to basic heart sounds, said second frequency range of said physiological signals including frequencies that correspond to sounds of interest, the sounds of interest having frequencies that are higher than frequencies of the basic heart sounds; and
an analog to digital converter configured to sample the resulting amplified physiological signals in at least said second frequency range and convert the resulting sampled signals to digital signals.
2. The assembly of claim 1 , further comprising: a display for displaying said digital signals.
3. The assembly of claim 1 , said analog to digital converter having a sampling rate between 4 and 48 KHz.
4. The assembly of claim 1 , said amplifier being configured such that said first frequency range of amplified signals has a lower end of approximately 10 Hz.
5. The assembly of claim 1 , said amplifier being configured such that said second frequency range of amplified signals has a lower end of approximately 100 Hz.
6. The assembly of claim 1 , said amplifier being configured such that said second level is approximately 20 dB higher than said first level.
7. The assembly of claim 1 , said amplifier being configured such that said first range and said second range have a crossover point of approximately 100 Hz.
8. The assembly of claim 1 , said amplifier including a band-pass amplifier.
9. The assembly of claim 1 , further comprising: a filter for filtering said amplified physiological signals in said first frequency range and said second frequency range.
10. The assembly of claim 1 , said amplifier being configured such that said second frequency range of amplified signals has an upper end of approximately 2 KHz.
11. A method of detecting and processing physiological sounds, the method comprising:
sensing the physiological sounds to acquire analog physiological signals, the sensed physiological sounds including basic heart sounds and sounds of interest;
amplifying a first frequency range of the physiological signals to a first level;
amplifying a second frequency range of the physiological signals to a second level that is higher than the first level, the amplification of the signals in the second frequency range being substantially constant within the second frequency range, the amplification of the signals above the second frequency range declining with respect to frequency from the upper end of the second frequency range, the second frequency range including frequencies that are higher than frequencies in the first frequency range, the second frequency range including frequencies of the sounds of interest;
sampling the resulting amplified physiological signals in at least the second range; and
converting the resulting sampled signals to digital signals.
12. The method of claim 11 , further comprising: displaying the digital signals.
13. The method of claim 11 , further comprising: subjecting the digital signals to a Fourier transformation.
14. The method of claim 13 , further comprising: displaying a time component and a frequency component of the digital signals subjected to the Fourier transformation.
15. The method of claim 11 , said sampling being at a sampling rate between 4 and 48 Khz.
16. The method of claim 11 , a lower end of the first frequency range being approximately 10 Hz.
17. The method of claim 11 , a lower end of the second frequency range being approximately 100 Hz.
18. The method of claim 11 , the second level being approximately 20 dB higher than the first level.
19. The method of claim 11 , further comprising: determining whether features either contained within, or of, the digital signals match a known disease modality.
20. The method of claim 11 , the first frequency range and the second frequency range having a crossover point of approximately 100 Hz.
21. The method of claim 11 , said amplifying of the first frequency range and the second frequency range being completed with a band-pass amplifier.
22. The method of claim 11 , further comprising: filtering the amplified physiological signals in the first range and the second range.
23. The method of claim 11 , an upper end of the second frequency range being approximately 2 KHz.