- An engineer reading and using audio level meters compares to a musician
- reading or writing sheet-music. Just like there are virtuoso musicians
+ An engineer reading and using audio level meters compares to a musician
+ reading or writing sheet-music. Just like there are virtuoso musicians
- <li>When tracking, meters are used to ensure that the input
- signal does not <dfn>overload</dfn> and maintains reasonable
+ <li>When tracking, meters are used to ensure that the input
+ signal does not <dfn>overload</dfn> and maintains reasonable
- <li>At the mastering stage, meters are used to check
- compliance with upstream <dfn>level</dfn> and <dfn>loudness
+ <li>At the mastering stage, meters are used to check
+ compliance with upstream <dfn>level</dfn> and <dfn>loudness
manual. It is a complex subject with a history…
For background information and further reading we recommend:
</p>
manual. It is a complex subject with a history…
For background information and further reading we recommend:
</p>
- <dd>A <dfn>Digital Peak Meter</dfn> displays the absolute maximum signal
- of the raw audio PCM signal (for a given time). It is commonly used when
- tracking to make sure the recorded audio never clips. To that end, DPMs
+ <dd>A <dfn>Digital Peak Meter</dfn> displays the absolute maximum signal
+ of the raw audio PCM signal (for a given time). It is commonly used when
+ tracking to make sure the recorded audio never clips. To that end, DPMs
are always calibrated to 0 <abbr title="DeciBel Full
Scale">dBFS</abbr>, or the maximum level that can be represented digitally
are always calibrated to 0 <abbr title="DeciBel Full
Scale">dBFS</abbr>, or the maximum level that can be represented digitally
- in a given system. This value has no musical reason whatsoever and depends
- only on the properties of the signal chain or target medium. There are
- conventions for <dfn>fall-off-time</dfn> and <dfn>peak-hold</dfn>, but no
+ in a given system. This value has no musical reason whatsoever and depends
+ only on the properties of the signal chain or target medium. There are
+ conventions for <dfn>fall-off-time</dfn> and <dfn>peak-hold</dfn>, but no
chosen in <kbd class="menu">Edit > Preferences > GUI</kbd>.
</p>
</dd>
<dt>RMS meters</dt>
<dd>An <dfn><abbr title="Root Mean Square">RMS</abbr>-type meter</dfn>
chosen in <kbd class="menu">Edit > Preferences > GUI</kbd>.
</p>
</dd>
<dt>RMS meters</dt>
<dd>An <dfn><abbr title="Root Mean Square">RMS</abbr>-type meter</dfn>
- is an averaging meter that looks at the energy in the signal. It
- provides a general indication of loudness as perceived by humans. Ardour
+ is an averaging meter that looks at the energy in the signal. It
+ provides a general indication of loudness as perceived by humans. Ardour
features three RMS meters, all of which offer additonal peak indication.
<ul>
<li><dfn>K20</dfn>: A meter according to the K-system introduced by Bob
features three RMS meters, all of which offer additonal peak indication.
<ul>
<li><dfn>K20</dfn>: A meter according to the K-system introduced by Bob
- <dd><dfn><abbr title="International Electrontechnical Commission">IEC</abbr>-type
- <abbr title="Peak Programme Meters">PPM</abbr>s</dfn> are a mix between DPMs and
- RMS meters, created mainly for the purpose of
+ <dd><dfn><abbr title="International Electrontechnical Commission">IEC</abbr>-type
+ <abbr title="Peak Programme Meters">PPM</abbr>s</dfn> are a mix between DPMs and
+ RMS meters, created mainly for the purpose of
interoperability. Many national and institutional varieties exist (<abbr
title="European Broadcasting Union">EBU</abbr>, <abbr title="British Broadcasting
interoperability. Many national and institutional varieties exist (<abbr
title="European Broadcasting Union">EBU</abbr>, <abbr title="British Broadcasting
- These loudness and metering standards provide a common point of
- reference which is used by broadcasters in particular so that the
+ These loudness and metering standards provide a common point of
+ reference which is used by broadcasters in particular so that the
interchange of material is uniform across their sphere of influence,
regardless of the equipment used to play it back.
</p>
<p>
For home recording, there is no real need for this level of
interchange of material is uniform across their sphere of influence,
regardless of the equipment used to play it back.
</p>
<p>
For home recording, there is no real need for this level of
- interoperability, and these meters are only strictly required when
- working in or with the broadcast industry. However, IEC-type meters have
- certain characteristics (rise-time, ballistics) that make them useful
+ interoperability, and these meters are only strictly required when
+ working in or with the broadcast industry. However, IEC-type meters have
+ certain characteristics (rise-time, ballistics) that make them useful
- Their specification is very strict (300ms rise-time, 1–1.5% overshoot,
- flat frequency response). Ardour's VU meter adheres to that spec, but for
+ Their specification is very strict (300ms rise-time, 1–1.5% overshoot,
+ flat frequency response). Ardour's VU meter adheres to that spec, but for
- preferences and the theme-manager. Settings for the Peak and RMS+Peak meters
- as well as VU meter standards are found in
+ preferences and the theme-manager. Settings for the Peak and RMS+Peak meters
+ as well as VU meter standards are found in
Ardour itself are bar-graph type meters. Corresponding needle-style
meters—which take up more visual screen space—are available as
LV2 plugins (see image on the right):
Ardour itself are bar-graph type meters. Corresponding needle-style
meters—which take up more visual screen space—are available as
LV2 plugins (see image on the right):