ECG Database Applications Guide Table of Contents


snip - copy an excerpt of a DB record


snip -i input-record -n new-record [ options ]


snip copies the signal files (and, optionally, annotation files) of the specified input-record, and generates a header file, thereby creating the specified new-record. snip is usually used to extract an excerpt of its input-record, using the -f and -t options (see below) to specify the segment to be copied.

The program xform(1) can also perform this task, but offers additional flexibility (it can scale the signals, resample them at a different frequency, rearrange them, select subsets of them, or reformat them); snip is faster than xform, however.

Options are:

-a annotator
Copy the specified annotator as well as the signal files. Two or more annotator arguments, separated by spaces, can follow -a. An annotator supplied via the standard input may be specified using `-', but only immediately after `-a'; in this case only, annotations are copied to the standard output.
-f time
Begin at the specified time in the input record (default: the beginning of the record).
Print a usage summary.
-t time
Process until the specified time in the input record (default: continue to the end of the record).

The shell variable DB should be set and exported (see setdb(1) ).


output signal file
output header file (under MS-DOS, new-record.hea)
output annotation file (under MS-DOS, new-record.ann)


xform(1) , setdb(1)

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