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heartbeats [2010/06/15 01:33]
jochen
heartbeats [2010/06/29 19:17] (current)
jochen updated help
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 The [[xff]] IO reading class now supports reading the following formats: The [[xff]] IO reading class now supports reading the following formats:
   * ACQ (up until version <= 3.9.7)   * ACQ (up until version <= 3.9.7)
-  * TXT (use ''<​nowiki>​object = xff('​*.ntt'​);</​nowiki>''​ to read!)+  * TXT (use ''<​nowiki>​object = xff('​*.ntt'​);</​nowiki>''​ or ''<​nowiki>​object = xff(filename,​ 'ntt'​);</​nowiki>''​ to read!)
 and further formats might be added based on request and urgency. and further formats might be added based on request and urgency.
 +
 +In case the data is in a different format, you must ensure to first convert into one of the formats above or into a MAT file, which then can be read used like this:
 +
 +<code matlab heartbeats_readmat.m>​% load a mat file (e.g. an ACQ->MAT converted file)
 +load HPS1344_session1_ECG.mat;​
 + 
 +% create new NTT (used for methods on data!)
 +ntt = xff('​new:​ntt'​);​
 + 
 +% store data from mat file in ntt
 +ntt.Data = data;</​code>​
  
 ===== Reference (help) ===== ===== Reference (help) =====
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 <​file> ​ heartbeats ​ - detect heart beats and frequency in physio data <​file> ​ heartbeats ​ - detect heart beats and frequency in physio data
    
-  FORMAT: ​      [bp, bs, bf, bv, cp, wgd, wd] = heartbeats(sig [, opts])+  FORMAT: ​      [bp, bs, bf, bv, cp, wgd, wd, hrv] = heartbeats(sig [, opts])
    
   Input fields:   Input fields:
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          ​.badt ​     t-threshold for detecing irregularity (default: 25)          ​.badt ​     t-threshold for detecing irregularity (default: 25)
          ​.bppre ​    ​pre-defined positions (no detection, only inspection)          ​.bppre ​    ​pre-defined positions (no detection, only inspection)
 +         ​.calc ​     preprocessing calculcation,​ one of
 +                    {'​none'​} - don't to anything (default)
 +                    {'​absdiff'​} - use abs(diff(data))
 +                        if .detlength is not given, will be set to 0.02
 +                        if .skewdt is not given, will be set to 0.1
 +                    {'​diffsq'​} - square the diff of the data
 +                        if .detlength is not given, will be set to 0.01
 +                        if .skewdt is not given, will be set to 0.05
 +                    {'​fourthz'​} - fourth power of the z-transformed data
 +                        if .detlength is not given, will be set to 0.02
 +                        if .skewdt is not given, will be set to 0.04
 +                    {'​squarez'​} - square the z-transformed data
 +                        if .detlength is not given, will be set to 0.03
 +                        if .skewdt is not given, will be set to 0.1
 +                    {'​thirdz'​} - third power of the abs z-transformed data
 +                        if .detlength is not given, will be set to 0.02
 +                        if .skewdt is not given, will be set to 0.06
          ​.cleanup ​  ​interactive cleanup (default: false)          ​.cleanup ​  ​interactive cleanup (default: false)
          ​.detlength detection length threshold in seconds (default: 0.05)          ​.detlength detection length threshold in seconds (default: 0.05)
 +         ​.freq ​     data frequency in Hz (default: 1000)
          ​.pflength ​ pre-filter length in seconds (default: 0.025)          ​.pflength ​ pre-filter length in seconds (default: 0.025)
          ​.pfreps ​   pre-filter repetitions (default: 2)          ​.pfreps ​   pre-filter repetitions (default: 2)
-         ​.freq ​     data frequency in Hz (default: 1000) 
          ​.plot ​     plot mean +/- std estimate of signal (default: false)          ​.plot ​     plot mean +/- std estimate of signal (default: false)
 +         ​.plotfreq ​ samples per second to plot (default: 50)
          ​.plotwin ​  plot window size in seconds (default: 6)          ​.plotwin ​  plot window size in seconds (default: 6)
 +         ​.resfreq ​  ​resample data prior to detection (default: [])
          ​.segsize ​  ​segmentation size in seconds (default: 5)          ​.segsize ​  ​segmentation size in seconds (default: 5)
          ​.segstep ​  ​stepping (window shift) in seconds (default: 1)          ​.segstep ​  ​stepping (window shift) in seconds (default: 1)
-         .windsor ​  ​windsorizing ​threshold in std's (default: 3)+         .skewdt ​   skewness detection threshold multiplier (default: 0.5) 
 +         ​.winsor ​   winsorizing ​threshold in std's (default: 3)
    
   Output fields:   Output fields:
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         wgd         guess whether window is good or not         wgd         guess whether window is good or not
         wd          windowed data (in 100Hz resolution, interpolated)         wd          windowed data (in 100Hz resolution, interpolated)
 +        hrv         ​output of computehrv(bp)
    
-  Note: this function is still preliminary</​file>​+  Note: this function is still preliminary, other options passed on to 
 +        computehrv (if 8th output is requested), with .hrvrfreq being 
 +        set to .resfreq</​file>​
  
 ===== Usage overview ===== ===== Usage overview =====
heartbeats.1276558408.txt.gz · Last modified: 2010/06/15 01:33 by jochen