LV2 Units

• Description
• Index
• Documentation
• Releases
• Data
  • lv2-units.doap.ttl
  • units.ttl

This vocabulary defines a number of units for use in audio processing.

For example, to say that a gain port's value is in decibels (units:db)

@prefix units: <http://lv2plug.in/ns/extensions/units#> .
@prefix eg:    <http://example.org/> .

eg:plugin lv2:port [
    a            lv2:ControlRateInputPort ;
    lv2:datatype lv2:Float ;
    lv2:index    0 ;
    lv2:symbol   "gain" ;
    lv2:name     "gain" ;
    units:unit   units:db
] .

Using the same form, plugins may also specify one-off units inline, to give better display hints to hosts:

eg:plugin lv2:port [
    a            lv2:ControlRateInputPort ;
    lv2:datatype lv2:Float ;
    lv2:index    0 ;
    lv2:symbol   "frob" ;
    lv2:name     "frob level" ;
    units:unit [
        a            units:Unit ;
        units:name   "frobnication" ;
        units:symbol "fr" ;
        units:render "%f f"
    ]
] .

It is also possible to define conversions between various units, which makes it possible for hosts to automatically and generically convert from a given unit to a desired unit. The units defined in this extension include conversion definitions where it makes sense to do so.

Classes

• Conversion
• Unit

Properties

conversion, factor, name, prefixConversion, render, symbol, to, unit

Instances

bar, beat, bpm, cent, cm, coef, db, degree, frame, hz, inch, khz, km, m, mhz, midiNote, mile, min, mm, ms, oct, pc, s, semitone12TET

Version 5.6 (2012-04-17)

• Add header of URI defines.
• Add unit for audio frames.
• Merge with unified LV2 package.

Version 5.4 (2011-11-21)

• Define used but undefined resources (units:name, units:render, units:symbol, units:Conversion, units:conversion, units:prefixConversion, units:to, and units:factor).
• Update packaging.
• Make units.ttl a valid OWL 2 DL ontology.
• Improve documentation.

Version 5.2 (2010-10-05)

• Convert documentation to HTML and use lv2:documentation.
• Add build system (for installation).

Version 5.0 (2010-10-05)

• Initial release.
• Define used but undefined resources (units:name, units:render, units:symbol, units:Conversion, units:conversion, units:prefixConversion, units:to, and units:factor).
• Improve documentation.
• Update packaging.