sigamp - measure signal amplitudes of a WFDB record
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%).
- -a annotator
- Measure QRS
peak-to-peak amplitudes based on normal QRS annotations from the specified
- -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).
- Print a usage summary.
- 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).
results in physical units (default: ADC units). -p may be followed by a single
character to specifify a time format (used with -q and -v when printing individual
measurements); choices are -pd (time of day and date if known), -pe (elapsed
time in hours, minutes, and seconds), -ph (elapsed time in hours), -pm (elapsed
time in minutes), -ps (elapsed time in seconds (default)), -pS (elapsed time
in sample intervals).
- Quick mode: print individual measurements only.
- 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.
- 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)
George B. Moody (email@example.com)
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Updated 22 February 2013