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# WFDB Applications Guide

Tenth Edition
11 March 2000
George B. Moody
Harvard-MIT Division of Health Sciences and Technology

Copyright ©1980-2000 George B. Moody

The most recent versions of the programs described in this guide may be freely downloaded from PhysioNet. For further information, write to:

> George B. Moody
> MIT Room E25-505A
> Cambridge, MA 02139
> USA

A PostScript version of this guide is available. The latest version can be downloaded from PhysioNet. Printed copies of this guide are available for $10 each (including shipping by surface mail) by writing to the address above. Please make checks payable to ``Beth Israel Hospital Biomedical Engineering Division.''

Permission is granted to make and distribute verbatim copies of this guide provided that the copyright notice and this permission notice are preserved on all copies.

Permission is granted to copy and distribute modified versions of this guide under the conditions for verbatim copying, provided also that the entire resulting derived work is distributed under the terms of a permission notice identical to this one.

Permission is granted to copy and distribute translations of this guide into another language, under the above conditions for modified versions.

## Contents

### Introduction

### Applications

- a2m, ad2m, m2a, md2a: utilities for converting between MIT and AHA DB formats
- ann2rr, rr2ann: convert annotation files to interval lists and vice versa
- bxb: ANSI/AAMI-standard beat-by-beat annotation comparator
- calsig: calibrate signals of a WFDB record
- coherence: estimate coherence and cross-spectrum of two time series
- ecgeval: generate and run ECG analyzer evaluation script
- epic: ANSI/AAMI-standard episode-by-episode annotation comparator
- fft: fast Fourier transform
- fir: general-purpose FIR filter for WFDB records
- hrfft, hrlomb, hrmem, hrplot: calculate and plot heart rate power spectra
- ihr: calculate instantaneous heart rate
- log10: calculate common logarithms of two-column data
- lomb: estimate power spectrum using the Lomb periodogram method
- memse: estimate power spectrum using the maximum entropy (all poles) method
- mfilt: general-purpose median filter for WFDB records
- mrgann: merge annotation files
- mxm: ANSI/AAMI-standard measurement-by-measurement comparator
- nst: noise stress test for ECG analysis programs
- plot2d, plot3d: make 2-D or 3-D plots from text files of data, using gnuplot
- plotstm: produce scatter plot of ST measurement errors on a PostScript device
- pschart: produce annotated `chart recordings' on a PostScript device
- psfd: produce annotated `full disclosure' plots on a PostScript device
- rdann: read a WFDB annotation file
- rdsamp: read WFDB signal files
- rxr: ANSI/AAMI-standard run-by-run annotation comparator
- sampfreq: show sampling frequency for a record
- sample: digitize and replay analog signals (MS-DOS only)
- setwfdb, cshsetwfdb: set WFDB environment variables
- sigamp: measure signal amplitudes of a WFDB record
- skewedit: edit skew fields of header file(s)
- snip: copy an excerpt of a WFDB record
- sortann: rearrange annotations in canonical order
- sqrs, sqrs125: single-channel QRS detector
- sumann: summarize the contents of a WFDB annotation file
- sumstats: derive aggregate statistics from bxb, rxr, etc., line-format output
- tach: heart rate tachometer
- view, vsetup: WFDB browser for MS-DOS
- wave: waveform analyzer, viewer, and editor for the X Window System
- wfdbcat: copy WFDB files to standard output
- wfdbcollate: collate WFDB records into a multi-segment record
- wfdbdesc: read signal specifications
- wfdbwhich: find a WFDB file and print its pathname
- wrann: write a WFDB annotation file
- wrsamp: write WFDB signal files
- wview: WFDB browser for MS Windows
- xform: sampling frequency, amplitude, and format conversion for WFDB records

### Functions

- wfdb: Waveform Database library

### File formats

- annot: WFDB annotation file format
- header: WFDB header file format
- signal: WFDB signal file format
- wfdbcal: WFDB calibration file format

### Appendices

- Installing the WFDB Software Package
- Evaluating ECG Analyzers

## Other links of interest

- PhysioNet
  PhysioNet offers free access via the web to large collections of recorded physiologic signals and related open-source software. PhysioNet is a public service of the Research Resource for Complex Physiologic Signals, funded by the National Center for Research Resources of the National Institutes of Health. The most recent version of this guide, and of the software it describes, may be obtained from PhysioNet.
- The MIT-BIH Database Distribution Home Page
  Information about obtaining CD-ROMs containing many of the databases available from PhysioNet, and printed copies of this and related manuals, can be found here.
- WFDB Programmer's Guide
  Includes tutorial and reference material relating to the WFDB library, a portable set of functions (subroutines) for reading and writing files in the formats supported by the applications described here. The WFDB library may be used with C, C++, or Fortran programs; the guide primarily describes the C interface.
- WAVE User's Guide
  A comprehensive tutorial, with extensive reference material, for WAVE, an interactive waveform browser with facilities for annotation editing and control of external analysis programs. WAVE runs on PCs under the free Linux operating system, and on SPARC-based systems under SunOS or Solaris.