Calculates the spectrogram of a signal

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Description

Calculates the spectrogram of the heart rate signal after filtering and interpolation in a window of a certain size

Usage

1
CalculateSpectrogram(HRVData, size, shift, sizesp = 1024, verbose=NULL)

Arguments

HRVData

Data structure that stores the beats register and information related to it

size

Size of window for calculating spectrogram (seconds)

shift

Displacement of window for calculating spectrogram (seconds)

sizesp

Points for calculating spectrogram (zero padding)

verbose

Deprecated argument maintained for compatibility, use SetVerbose() instead

Value

Returns the spectrogram of the heart rate signal

Note

An example including all the necessary steps to obtain the spectrogram
of a wfdb register is giving below:

##Reading a wfdb register and storing into a data structure:
md = CreateHRVData(Verbose = TRUE)
md = LoadBeatWFDB(md, RecordName = "register_name",
RecordPath = "register_path", verbose = TRUE)

##Calculating heart rate signal:
md = BuildNIHR(md)

##Filtering heart rate signal:
md = FilterNIHR(md)

##Interpolating heart rate signal:
md = InterpolateNIHR(md)

##Calculating spectrogram:
CalculateSpectrogram(md, size = 120, shift = 10, sizesp = 1024)

Author(s)

M. Lado, A. Mendez, D. Olivieri, L. Rodriguez, X. Vila

References

L. Rodriguez-Linares, A. Mendez, M. Lado, D. Olivieri, X. Vila, I. Gomez-Conde, "An open source tool for heart rate variability spectral analysis", Computer Methods and Programs in Biomedicine 103, 39-50, doi:10.1016/j.cmpb.2010.05.012 (2011)

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