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Stethoscope with digital frequency translation for improved audibility.

Herbert M Aumann1, Nuri W Emanetoglu1

  • 1Department of Electrical and Computer Engineering, University of Maine, Orono, ME 04420, USA.

Healthcare Technology Letters
|December 17, 2019
PubMed
Summary

This study introduces a digital stethoscope enhancement that shifts low-frequency sounds to a higher, audible range. This innovation benefits hearing-impaired physicians and improves performance in noisy environments.

Keywords:
Hilbert transformerHilbert transformsacoustic stethoscopeanalog frequency translatoranalogue-digital conversionaudio coder-decoderaudio codingbioacousticsbiomedical equipmentcardiologychest soundsdigital frequency translationfrequency 200.0 Hzfrequency 72.0 MHzhearing impaired physiciansheart soundsintestinal soundsmedical signal processingmicrocontrollermicrocontrollersmodulationsingle sideband suppressed carrier modulationtime delay

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Area of Science:

  • Biomedical Engineering
  • Acoustics
  • Signal Processing

Background:

  • Acoustic stethoscopes detect vital body sounds, but low-frequency components are often inaudible.
  • Hearing impairment and noisy environments significantly hinder accurate auscultation.
  • Existing analog frequency translators face stability and bias issues.

Purpose of the Study:

  • To enhance acoustic stethoscope performance by translating low-frequency sounds.
  • To provide a solution for hearing-impaired physicians and noisy environments.
  • To develop a stable, all-digital frequency translation technique.

Main Methods:

  • Implemented a digital frequency translation technique based on single sideband suppressed carrier modulation.
  • Approximated a Hilbert transformer with a time delay for real-time audio processing.
  • Utilized a 16-bit 44.1 Ks/s audio coder/decoder and a 32-bit 72 MHz microcontroller for verification.

Main Results:

  • Successfully translated sounds below 50 Hz to a 200 Hz range without loss of fidelity.
  • Achieved real-time audio processing capabilities.
  • Demonstrated stability and avoided bias issues inherent in analog systems.

Conclusions:

  • The digital frequency translation method significantly improves stethoscope performance.
  • This technique offers substantial benefits for hearing-impaired physicians.
  • The all-digital approach provides a robust and reliable solution for enhanced auscultation.