WFDB Applications Guide - PhysioNet

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EPICMP(1) WFDB Applications Guide EPICMP(1) SEE ALSO bxb(1), ecgeval(1), mxm(1), plotstm(1), rxr(1), setwfdb(1), sumstats(1) Evaluating ECG Analyzers (in the WFDB Applications Guide) American National Standard ANSI/AAMI EC38:1998, Ambulatory Electrocardiographs; available from AAMI, 1110 N Glebe Road, Suite 220, Arlington, VA 22201 USA (http://www.aami.org/). AUTHOR George B. Moody (george@mit.edu) SOURCE http://www.physionet.org/physiotools/wfdb/app/epicmp.c 24 10 July 2003 WFDB 10.3.8
FFT(1) WFDB Applications Guide FFT(1) NAME fft −fast Fourier transform SYNOPSIS fft [ options ... ] input-file DESCRIPTION fft transforms a real-valued time series (from the specified input-file, orfrom the standard input if input-file is specified as ‘‘-’’; input-file must be in text form) into a frequency spectrum (on the standard output). Using appropriate options, fft can produce polar or rectangular format amplitude spectra, or power spectra, or it can perform an inverse FFT to transform a polar or rectangular format amplitude spectrum into a time series. The input series may be corrected if it has a non-zero mean amplitude or first derivative (by ‘zeromeaning’ or ‘detrending’ the input series). Output spectra may be smoothed in several different ways. By default, the standard output is the magnitude of the discrete Fourier transform of the input series, normalized such that the mean of the squares of the inputs is equal to the sum of the squares of the outputs (i.e., the RMS power determined from the time series equals the total power determined from the spectrum; this normalization is correct only if the input series has a mean value of zero). Options are: -c Output unnormalized complex FFT (real components in first column, imaginary components in second column). -f frequency Show the center frequency for each bin in the first column. The frequency argument specifies the input sampling frequency; the center frequencies are given inthe same units. -h Print a usage summary. -i Perform inverse FFT; inthis case, the standard input should be in the form generated by fft -c, and the standard output is a series of samples. No other options may be used with -i. -I Perform inverse FFT as above, but using input generated by fft -p. Noother options may be used with -I. -l n Perform up to n-point transforms. fft rounds n up to the next higher power of two unless n is already a power of two. If the input series contains fewer than n samples, it is padded with zeros up to the next higher power of two. Any additional input samples beyond the first n are not read. Default: n =16384. -n n Process the input in overlapping chunks of n samples and output an averaged spectrum. If used in combination with -P, the output is the average of the individual squared magnitudes; otherwise, the output is derived from the averages of the real components and of the imaginary components taken separately. For best results, n should be a power of two. -N n Process the input in overlapping chunks of n samples and output a spectrum for each chunk. Successive spectra are concatenated in the output. Only one of -n and -N may be used at a time. For best results, n should be a power of two. -p Show the phase in radians in the last column. -P Generate a power spectrum (print squared magnitudes). -s n Smooth the output by applying an n-point moving average to each bin. This option does not change the number of bins. -S n Smooth the output by summing sets of n consecutive bins. This option reduces the number of bins by a factor of n. -w window-type Apply the specified window tothe input data. window-type may be one of: ‘Bartlett’, ‘Blackman’, ‘Blackman-Harris’, ‘Hamming’, ‘Hanning’, ‘Parzen’, ‘Square’, and ‘Welch’. The ‘Square’ window type is equivalent to using no window atall; this is also variously known as a rectangular or Dirichlet window. WFDB 10.2.7 8August 2002 25
Page 1 and 2: WFDB Applications Guide Tenth Editi
Page 3 and 4: Contents WFDB Applications Guide Co
Page 5 and 6: Introduction WFDB Applications Guid
Page 7 and 8: FAQ WFDB Applications Guide FAQ Fre
Page 9 and 10: A2M(1) WFDB Applications Guide A2M(
Page 11 and 12: A2M(1) WFDB Applications Guide A2M(
Page 13 and 14: ANN2RR(1) WFDB Applications Guide A
Page 15 and 16: ANN2RR(1) WFDB Applications Guide A
Page 17 and 18: BXB(1) WFDB Applications Guide BXB(
Page 19 and 20: CALSIG(1) WFDB Applications Guide C
Page 21 and 22: DFA(1) WFDB Applications Guide DFA(
Page 23 and 24: ECGEVAL(1) WFDB Applications Guide
Page 25 and 26: ECGPUWAVE(1) WFDB Applications Guid
Page 27 and 28: EDF2MIT(1) WFDB Applications Guide
Page 29 and 30: EDR(1) WFDB Applications Guide EDR(
Page 31: EPICMP(1) WFDB Applications Guide E
Page 35 and 36: FIR(1) WFDB Applications Guide FIR(
Page 37 and 38: GQFUSE(1) WFDB Applications Guide G
Page 39 and 40: GQRS(1) WFDB Applications Guide GQR
Page 41 and 42: HRFFT(1) WFDB Applications Guide HR
Page 43 and 44: IHR(1) WFDB Applications Guide IHR(
Page 45 and 46: IMAGEPLT(1) WFDB Applications Guide
Page 47 and 48: LOMB(1) WFDB Applications Guide LOM
Page 49 and 50: LWCAT(1) WFDB Applications Guide LW
Page 51 and 52: MEMSE(1) WFDB Applications Guide ME
Page 53 and 54: MRGANN(1) WFDB Applications Guide M
Page 55 and 56: MXM(1) WFDB Applications Guide MXM(
Page 57 and 58: NGUESS(1) WFDB Applications Guide N
Page 59 and 60: NST(1) WFDB Applications Guide NST(
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Page 63 and 64: PARSESCP(1) WFDB Applications Guide
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Page 67 and 68: PLOTxD(1) WFDB Applications Guide P
Page 69 and 70: PLT(1) WFDB Applications Guide PLT(
Page 75 and 76: PLTF(1) WFDB Applications Guide PLT
Page 77 and 78: PNNLIST(1) WFDB Applications Guide
Page 79 and 80: PSCHART(1) WFDB Applications Guide
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PSFD(1) WFDB Applications Guide PSF
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PSFD(1) WFDB Applications Guide PSF
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RDANN(1) WFDB Applications Guide RD
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RDEDFANN(1) WFDB Applications Guide
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RDSAMP(1) WFDB Applications Guide R
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RXR(1) WFDB Applications Guide RXR(
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SETWFDB(1) WFDB Applications Guide
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SIGAMP(1) WFDB Applications Guide S
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SIGNAME(1) WFDB Applications Guide
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SKEWEDIT(1) WFDB Applications Guide
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SORTANN(1) WFDB Applications Guide
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SQRS(1) WFDB Applications Guide SQR
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STEPDET(1) WFDB Applications Guide
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SUMSTATS(1) WFDB Applications Guide
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TA CH(1) WFDB Applications Guide TA
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WABP(1) WFDB Applications Guide WAB
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WAV2MIT(1) WFDB Applications Guide
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WAVE(1) WFDB Applications Guide WAV
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WFDB2MAT(1) WFDB Applications Guide
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WFDBCAT(1) WFDB Applications Guide
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WFDBCOLLATE(1) WFDB Applications Gu
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WFDBMAP(1) WFDB Applications Guide
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WFDBWHICH(1) WFDB Applications Guid
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WQRS(1) WFDB Applications Guide WQR
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WRSAMP(1) WFDB Applications Guide W
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XFORM(1) WFDB Applications Guide XF
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WFDB(3) WFDB Applications Guide WFD
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WFDB(3) WFDB Applications Guide WFD
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WFDBF(3) WFDB Applications Guide WF
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ANNOT(5) WFDB Applications Guide AN
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HEADER(5) WFDB Applications Guide H
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SIGNAL(5) WFDB Applications Guide S
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WFDBCAL(5) WFDB Applications Guide
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Evaluating ECG Analyzers George B.
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Evaluating ECG Analyzers WFDB Appli
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