diff options
Diffstat (limited to 'mdala.lv2/Dither.ttl')
| -rw-r--r-- | mdala.lv2/Dither.ttl | 37 |
1 files changed, 33 insertions, 4 deletions
diff --git a/mdala.lv2/Dither.ttl b/mdala.lv2/Dither.ttl index 89a8b27..7f6faf2 100644 --- a/mdala.lv2/Dither.ttl +++ b/mdala.lv2/Dither.ttl @@ -2,6 +2,8 @@ @prefix lv2: <http://lv2plug.in/ns/lv2core#> . @prefix mdala: <http://drobilla.net/plugins/mdala/> . @prefix pg: <http://lv2plug.in/ns/ext/port-groups#> . +@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . +@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . mdala:Dither a lv2:Plugin , @@ -13,6 +15,17 @@ mdala:Dither lv2:pluginProperty lv2:hardRTCapable ; pg:mainInput mdala:mainIn ; pg:mainOutput mdala:mainOut ; + rdfs:comment """When a waveform is rounded to the nearest 16 (or whatever)-bit value this causes distortion. Dither allows you to exchange this rough sounding signal-dependant distortion for a smooth background hiss. + +Some sort of dither should always be used when reducing the word length of digital audio, such as from 24-bit to 16-bit. In many cases the background noise in a recording will act as dither, but dither will still be required on fades and on very clean recordings such as purely synthetic sources. + +Noise shaping makes the background hiss of dither sound quieter, but adds more high-frequency noise than 'ordinary' dither. This high frequency noise can be a problem if a recording is later processed in any way (including gain changes) especially if noise shaping is applied a second time. + +If you are producing an absolutely final master at 16 bits or less, use noise shaped dither. In all other situations use a non-noise-shaped dither such as high-pass-triangular. When mastering for MP3 or other compressed formats be aware that noise shaping may take some of the encoder's 'attention' away from the real signal at high frequencies. + +No gain changes should be applied after this plug-in. Make sure any master output fader is set to 0.0 dB in the host application. + +Very technical note This plug-in follows Steinberg's convention that a signal level of 1.0 corresponds to a 16-bit output of 32768. If your host application does not allow this exact gain setting the effectiveness of dither may be reduced (check for harmonic distortion of a 1 kHz sine wave using a spectrum analyser).""" ; lv2:port [ a lv2:InputPort , lv2:ControlPort ; @@ -30,7 +43,20 @@ mdala:Dither lv2:symbol "dither" ; lv2:default 0.88 ; lv2:minimum 0.0 ; - lv2:maximum 1.0 + lv2:maximum 1.0 ; + lv2:scalePoint [ + rdfs:label "Truncation" ; + rdf:value 0.0 + ] , [ + rdfs:label "Triangular PDF dither" ; + rdf:value 0.25 + ] , [ + rdfs:label "High-pass Triangular PDF dither" ; + rdf:value 0.5 + ] , [ + rdfs:label "Second-order noise-shaped dither" ; + rdf:value 0.75 + ] ] , [ a lv2:InputPort , lv2:ControlPort ; @@ -39,7 +65,8 @@ mdala:Dither lv2:symbol "dith_amp" ; lv2:default 0.5 ; lv2:minimum 0.0 ; - lv2:maximum 1.0 + lv2:maximum 1.0 ; + rdfs:comment """Dither amplitude - can be turned down to reduce background hiss at the expense of dither level "pumping" caused by the input signal type and level""" ] , [ a lv2:InputPort , lv2:ControlPort ; @@ -48,7 +75,8 @@ mdala:Dither lv2:symbol "dc_trim" ; lv2:default 0.5 ; lv2:minimum 0.0 ; - lv2:maximum 1.0 + lv2:maximum 1.0 ; + rdfs:comment "Fine tune DC offset - can help get best dither sound for silent or very quiet inputs" ] , [ a lv2:InputPort , lv2:ControlPort ; @@ -57,7 +85,8 @@ mdala:Dither lv2:symbol "zoom" ; lv2:default 0 ; lv2:minimum 0.0 ; - lv2:maximum 1.0 + lv2:maximum 1.0 ; + rdfs:comment """Allows the signal to be faded into the noise floor at a clearly audible level so dither settings can be "auditioned". Note that some (perceptual) properties of dither will change when listened to in this way""" ] , [ a lv2:InputPort , lv2:AudioPort ; |