Separation of heart sound signal from lung sound signal by adaptive line enhancement

This paper presents a technique for separation of heart sound signal (HSS) from lung sound signal (LSS) using adaptive line enhancement (ALE). The ALE is used to extract a semi-periodic signal component (HSS) from a synthetic white Gaussian noise (WGN). Application of ALE to separation of HSS from LSS has also been demonstrated. For when synthetic data (WGN) is combined with the HSS, it is found that ALE can separate the HSS at input signal-to-noise ratio (SNR_in) of 27dB. The results for when the ALE is applied to the combined HSS-LSS show that ALE can separate HSS even if the SNR_in equals ×5dB.