.TH ANN2RR 1 "28 October 2009" "WFDB 10.4.24" "WFDB Applications Guide"
.SH NAME
ann2rr, rr2ann \- convert annotation files to interval lists and vice versa
.SH SYNOPSIS
\fBann2rr -r\fR \fIrecord\fR \fB-a\fR \fIannotator\fR [ \fIoptions\fR ... ]
.br
\fBrr2ann -r\fR \fIrecord\fR \fB-a\fR \fIannotator\fR [ \fIoptions\fR ... ]
.SH DESCRIPTION
These programs are typically used to obtain RR interval series from ECG
annotation files, or to create an annotation file from such a series, but
they have a wider range of uses.
.SS "ann2rr"
.PP
Use \fBann2rr\fR to extract a list of intervals, in text format, from an
annotation file. By default, the intervals are listed in units of sample
intervals (use \fBsampfreq\fR(1) to determine the sampling frequency of the
input record if necessary). Options for \fBann2rr\fR include:
.TP
\fB-A\fR
Print all intervals between annotations. By default, \fBann2rr\fR prints
only RR intervals (those between QRS (beat) annotations). This option
overrides the \fB-c\fR and \fB-p\fR options.
.TP
\fB-c\fR
Print intervals between consecutive valid annotations only. (See discussion
below.)
.TP
\fB-f\fR \fItime\fR
Begin at the specified \fItime\fR. By default, \fBann2rr\fR starts at the
beginning of the record.
.TP
\fB-h\fR
Print a usage summary.
.TP
\fB-i\fR \fIformat\fR
Print intervals in the specified \fIformat\fR. By default, intervals are
printed in units of sample intervals. Other \fIformat\fRs include \fBs\fR
(seconds), \fBm\fR (minutes), \fBh\fR (hours), and \fBt\fR (time interval
in hh:mm:ss format). Formats \fBs\fR, \fBm\fR, and \fBh\fR may be followed
by an integer between 0 and 15 inclusive, specifying the number of decimal
places (default: 3). For example, use the option \fB-is8\fR to obtain
intervals in seconds with 8 decimal places.
.TP
\fB-p\fR \fItype\fR [ \fItype\fR ... ]
Print intervals ended by annotations of the specified \fItypes\fR only.
The \fItype\fR arguments should be annotation mnemonics (e.g., \fBN\fR),
as normally printed by \fBrdann\fR(1) in the third column. More than one
\fB-p\fR option may be used in a single command, and each \fB-p\fR option may
have more than one \fItype\fR argument following it. If \fItype\fR begins
with ``-'', however, it must immediately follow \fB-p\fR (standard annotation
mnemonics do not begin with ``-'', but modification labels in an annotation
file may define such mnemonics).
.TP
\fB-P\fR \fItype\fR [ \fItype\fR ... ]
Print intervals begun by annotations of the specified \fItypes\fR only.
.TP
\fB-t\fR \fItime\fR
Stop at the specified \fItime\fR.
.TP
\fB-v\fR \fIformat\fR
Print final times (the times of occurrence of the annotations that end each
interval). This option accepts all of the \fIformat\fRs defined for \fB-i\fR,
as well as \fBT\fR (to print the date and time in [hh:mm:ss dd/mm/yyyy] if the
starting time and date have been recorded in the header file for \fIrecord\fR).
If this option is chosen, the times appear at the end of each line of output.
.TP
\fB-V\fR \fIformat\fR
Print initial times (the times of occurrence of the annotations that begin each
interval). Any of the \fIformat\fRs usable for the \fB-v\fR option may be used
with \fB-V\fR. If this option is chosen, the times appear at the beginning of
each line of output.
.TP
\fB-w\fR
Print final annotations (the types (\fBN\fR, \fBV\fR, etc., as for \fB-p\fR
above) of the annotations that end each interval), immediately following the
intervals in each line of output.
.TP
\fB-W\fR
Print initial annotations (the types of the annotations that begin each
interval), immediately before the interval in each line of output.
.PP
The \fB-c\fR option, used without the \fB-p\fR option, causes \fBann2rr\fR to
filter out intervals between beats that have intervening non-beat annotations,
such as rhythm or signal quality change annotations. Used with the \fB-P\fR
and \fB-p\fR options, the \fB-c\fR option causes \fBann2rr\fR to reject
intervals between annotations of the type(s) specified by \fB-p\fR if there are
annotations of any other types intervening; thus, for example,
``\fB-c -P N -p N\fR'' yields only intervals between consecutive normal beats,
and intervals between pairs of normal beats surrounding an ectopic beat are
discarded from the output. As another example, ``\fB-c -P N -p V\fR'' yields
premature ventricular coupling intervals only (a coupling interval is the
interval between a normal beat and an immediately following premature
ventricular contraction).
.PP
The default output contains a single column of intervals only; by using the
\fB-v\fR, \fB-V\fR, \fB-w\fR, and \fB-W\fR options, up to five columns,
separated by tabs, may be output. The order of the columns is fixed (initial
times, initial annotations, intervals, final annotations, final times).
.SS "rr2ann"
.PP
Use \fBrr2ann\fR to create an annotation file from the standard input,
which should usually be a list of intervals in the format produced by
\fBann2rr\fR. (For exceptions, see \fB-T\fR, \fB-w\fR, and \fB-x\fR below.)
The first token on each line is taken as an interval, and (if the \fB-w\fR
option is present) the second token is taken as an annotation mnemonic;
anything else on the same line is ignored, as are empty lines, spaces and tabs
at the beginning of a line, non-numeric tokens and anything following
them on the same line, negative intervals, and zero intervals. The
output consists of a binary annotation file (\fIrecord\fR.\fIannotator\fR),
and (if it does not exist already) a text header file (\fIrecord\fR.hea).
Options for \fBrr2ann\fR include:
.TP
\fB-F\fR \fIfrequency\fR
Assume the specified sampling \fIfrequency\fR. This option has no effect
unless it is necessary for \fBrr2ann\fR to create a header file; in this case,
a sampling frequency of 250 Hz is assumed if the \fB-F\fR option is omitted.
.TP
\fB-h\fR
Print a usage summary.
.TP
\fB-T\fR
Interpret the input as times of occurrence, rather than as intervals.
.TP
\fB-w\fR
Set each annotation type from the mnemonic (\fBN\fR, \fBV\fR, etc.) in the
second column of the input (in the format produced by \fBann2rr\fR using
its \fB-w\fR option).
.TP
\fB-x\fR \fIn\fR
Multiply input by \fIn\fR to obtain intervals (or, if \fB-T\fR is also used,
times of occurrence) in units of sample intervals). Default: \fIn\fR = 1.
.PP
Note that \fBwrann\fR(1) also provides a way to generate an annotation file
from text. Unlike that of \fBrr2ann\fR, \fBwrann\fR's input format permits
specifying annotation subtypes and other fields.
.SH ENVIRONMENT
.PP
It may be necessary to set and export the shell variable \fBWFDB\fR (see
\fBsetwfdb\fR(1)).
.SH FILES
.TP 22
\fIrecord\fR.hea
header file
.TP 22
\fIrecord\fR.\fIannotator\fR
annotation file
.SH AVAILABILITY
These programs are provided in the \fIapp\fR directory of the WFDB Software
Package. Run \fBmake\fR in that directory to compile and install them if they
have not been installed already.
.PP
The PhysioNet ATM (http://physionet.org/cgi-bin/ATM) provides web access to
\fBann2rr\fR (select \fBShow RR intervals as text\fR from the Toolbox).
.SH SEE ALSO
\fBrdann\fR(1), \fBsampfreq\fR(1), \fBsetwfdb\fR(1), \fBwrann\fR(1)
.SH AUTHOR
George B. Moody (george@mit.edu)
.SH SOURCE
http://www.physionet.org/physiotools/wfdb/app/ann2rr.c
.br
http://www.physionet.org/physiotools/wfdb/app/rr2ann.c