metpos — position in metric hierarchy
The metpos representation consists of simply a set of numerical values indicating the order of events. Normally, a metpos spine simply encodes a set of ascending integers marking the succession of events:
**metpos 1 2 3 4 5 *- ————
The metpos representation also recognizes kern-like
barlines. The presence of an equals-sign
in the first column of a <span class="rep">metpos</span> spine is used to denote
a barline. Immediately after the equals sign there may follow an
optional integer value indicating the measure number (e.g. =107
for measure 107). In addition, a lower-case alphabetic character may
be appended to the measure number — as in: =14b.
permits the user to distinguish measure numbers for first and second
endings. Measure numbers refer to the information immediately
following the barline, thus the token =23` occurs just prior to the
encoded beats for measure 23.
Double barlines are indicated by using two or more successive equals
signs ` (==).
Several consecutive equals signs may be encoded in
order to enhance readability (e.g. =======).
attribute for barlines is the *pause* — which is represented by
the— icolon (;). Thus the token =4;
means that the barline
starting measure number 4 has a pause written above or below it, while
the token =====;` means that a double barline contains a pause
It is recommended that files containing predominantly metpos data should be given names with the distinguishing `.mtp' extension.
The following table summarizes the metpos mappings of signifiers and signifieds.
0-9 decimal values . fractional delimiter; null token = barlines == double barline —– ———————————-
Summary of metpos Signifiers
A sample document is given below:
**kern **metpos *M4/4 *M4/4 *tb16 *tb16 *c: * =1 =1 8r 1 . 5 16cc 4 16bn 5 8cc 3 . 5 8g 4 . 5 8a- 2 . 5 16cc 4 16b 5 8cc 3 . 5 8dd 4 . 5 =2 =2 *- *- ———- ————
The following Humdrum commands accept metpos encoded data as inputs:
synco measure degree of metric syncopation urrhythm characterize the rhythmic prototypes in a passage – ——————————————- —————————————————
The following Humdrum command produces metpos data as output:
metpos generate metric position values for timebase-formatted kern or recip inputs – ————————————— ———————————————————————————————
The following tandem interpretations can be used in conjunction with metpos:
Tandem interpretations for metpos
` barlines, **date, **dur, **kern, kern, metpos, **ordo, **recip, **takt, **time, timebase, **Zeit`