SIGAMP(1)

NAME
sigamp - measure signal amplitudes of a WFDB record

SYNOPSIS
sigamp -r record [ options ... ]

DESCRIPTION

sigamp measures either baseline-corrected RMS amplitudes or (for suitably annotated ECG signals) normal QRS peak-to-peak amplitudes for all signals of the specified record. It makes up to 300 measurements (but see -n below) for each signal and calculates trimmed means (by discarding the largest and smallest 5% of the measurements and taking the mean of the remaining 90%).

Options include:

-a annotator
    Measure QRS peak-to-peak amplitudes based on normal QRS annotations from the specified annotator.

-d dt1 dt2
    Set the measurement window relative to QRS annotations. Defaults: dt1 = 0.05 (seconds before the annotation); dt2 = 0.05 (seconds after the annotation).

-f time
    Begin at the specified time in record (default: the beginning of record).

-h  Print a usage summary.

-H  Read the signal files in high-resolution mode (default: standard mode). These modes are identical for ordinary records. For multifrequency records, the standard decimation of oversampled signals to the frame rate is suppressed in high-resolution mode (rather, all other signals are resampled at the highest sampling frequency).

-n nmax
    Make up to nmax measurements on each signal (default: 300).

-p  Print results in physical units (default: ADC units).

-t time
    Process until the specified time in record (default: the end of the record). Processing will be terminated prematurely if 250 measurements are made before reaching the specified time.

-v  Verbose mode: print individual measurements as well as trimmed means.

-w dtw
    Set RMS amplitude measurement window. Default: dtw = 1 (second).

ENVIRONMENT

It may be necessary to set and export the shell variable WFDB (see setwfdb(1)).

SEE ALSO
calsig(1), setwfdb(1), sigavg(1)

AUTHOR
George B. Moody (george@mit.edu)

SOURCE
http://www.physionet.org/physiotools/wfdb/app/sigamp.c