Computational and Mathematical Methods in Medicine / 2012 / Article / Fig 4

Research Article

An Efficient Time-Varying Filter for Detrending and Bandwidth Limiting the Heart Rate Variability Tachogram without Resampling: MATLAB Open-Source Code and Internet Web-Based Implementation

Figure 4

Synthetic and clinical HRV records band-pass filtered by sequential application of SGP: raw data 𝑣 𝑡 0 “smoothed” to give 𝑣 𝑡 1 ; 𝑣 𝑡 2 = 𝑣 𝑡 0 𝑣 𝑡 1 (not shown); 𝑣 𝑡 2 “smoothed” to give 𝑣 𝑡 3 . Lomb Scargle Periodograms (LSPs) are for 𝑣 𝑡 0 , 𝑣 𝑡 2 , and 𝑣 𝑡 3 .
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