Brief Review — Research on bark-frequency spectral coefficients heart sound classification algorithm based on multiple window time-frequency reassignment

MWRS-BFSC + CNN2D

Sik-Ho Tsang
3 min readMay 18, 2024

Research on bark-frequency spectral coefficients heart sound classification algorithm based on multiple window time-frequency reassignment
MWRS-BFSC + CNN2D
, by Yunnan University, Kunming Medical University, and Fuwai Cardiovascular Hospital of Yunnan Province
2024 JBH (

@ Medium)

Phonocardiogram (PCG)/Heart Sound Classification
2013 …
2023 … [CTENN] [Bispectrum + ViT]
==== My Other Paper Readings Are Also Over Here ====

  • Bark-Frequency Spectral Coefficient (BFSC) with multiple window time-frequency reassignment (MWRS) is used as features input into CNN2D for heart sound classification.

Outline

  1. MWRS-BFSC + CNN2D
  2. Results

1. BFSC + CNN2D

Overall Diagram

1.1. Preprocessing

  • Due to no accurate heart sound segmentation algorithm, random segmentation is used.
  • The segment has 256 sampling points, which is 51.2ms long, the stride used is 128 sampling points.

1.2. MWRS-BFSC

Bark-Frequency Spectral Coefficient (BFSC)
  • The signal is pre-emphasized. Then Short-time Fourier Transform (STFT), S, is extracted.
  • The corresponding energy spectrogram, E, is:
  • BFSC is sensitive to noise. To increase the resolution, time-frequency spectogram with reassignment, RS, is used:
  • where:
  • Multiple window function is then used.
  • where k=4 and dk is just used for averaging.

1.3. CNN2D

CNN2D, CNN1D, GRU and LSTM
  • CNN2D, CNN1D, GRU, and LSTM are tried as above.
CNN2D

2. Results

CNN2D is found to be the best as above.

MWRS-BFSC is found to be the best.

k=4 is the best.

MWRS-BFSC + CNN (CNN2D) is the best.

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Sik-Ho Tsang

PhD, Researcher. I share what I learn. :) Linktree: https://linktr.ee/shtsang for Twitter, LinkedIn, etc.