rdsamp - read WFDB signal files
rdsamp -r record [ options ... ]
rdsamp reads signal files for the specified record and writes
the samples as decimal numbers on the standard output. If no options are
provided, rdsamp starts at the beginning of the record and prints all samples.
Each line of output contains the sample number and samples from each signal,
beginning with channel 0, separated by tabs.
Options include:
- -f time
- Begin
at the specified time. By default, rdsamp starts at the beginning of the
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).
- -l interval
- Limit
the amount of output to the specified time interval (in standard time format;
default: no limit). If both -l and -t are used, rdsamp stops at the earlier
of the two limits.
- -p
- Print times in seconds and milliseconds, and values
in physical units. By default, rdsamp prints times in sample intervals
and values in A/D units. Use -p -p to obtain higher precision in the sample
values (8 decimal places rather than 3).
- -s signal-list
- Print only the signals
named in the signal-list (one or more input signal numbers, separated by
spaces; default: print all signals). This option may be used to re-order
or duplicate signals.
- -t time
- Stop at the specified time. By default, rdsamp
stops at the end of the record.
- -v
- Print column headings.
It may
be necessary to set and export the shell variable WFDB (see setwfdb(1)
).
The first edition of the MIT-BIH Arrhythmia Database CD-ROM,
the first and second editions of the European ST-T Database CD-ROM, and the
first edition of the MIT-BIH Polysomnographic Database CD-ROM contain versions
of rdsamp that use an older command syntax (still supported by the current
version but not described here). Refer to bin.doc in the CD-ROM directory
that contains rdsamp for further information.
rdann(1)
, setwfdb(1)
,
wrsamp(1)
George B. Moody (george@mit.edu)
http://www.physionet.org/physiotools/wfdb/app/rdsamp.c
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