sigamp - measure signal amplitudes of a WFDB record
sigamp -r
record [ options ... ]
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).
It may be necessary to set and export the shell
variable WFDB (see setwfdb(1)
).
calsig(1)
, setwfdb(1)
, sigavg(1)
George B. Moody (george@mit.edu)
http://www.physionet.org/physiotools/wfdb/app/sigamp.c
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Updated 2 March 2006