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Re: master thesis - audio effect processors - terminology approach
Hi Felipe,
I am not sure whether this is really that simple. Just to give a few
examples:
Where would you sort in pitch-shifters and Auto-Tune, not uncommon audio
effects? Even for an exciter the categorization doesn't seem to be
obvious to me.
And what about non-realtime audio effects such as our harmony plugin
vielklang (http://vielklang.zplane.de)?
Best,
Alexander
Felipe Toussaint wrote:
>
> Dear sound processing experts,
>
> My name is Felipe Toussaint and I’m studying Terminology in the
> /Institut Libre Marie Haps/ (Brussels). I’m currently working on my
> master thesis dedicated to the “audio effect processors” that I will
> have to deliver on August 19.
>
> *_Approach_*: terminology
>
> *_Theme of the master thesis_* : audio effect processors
>
> *_Languages _*: English and French
>
> *_Number of terms per language_*: around 55 terms
>
> *_Objective_* :
>
> 1. To gather a non exhaustive list of audio effect processors.
> 2. To organize them into a hierarchy according to some parameters in
> order to get a tree (diagram).
> 3. To define those terms according to their places on the tree.
>
> One of the terminology work aspect is to have the result validated by
> experts. This is why I’m appealing to your experience and knowledge of
> this precise domain. So at first, I would have liked to have a feedback
> on the tree that you will find enclosed. Of course, I’m open to any
> criticism and/or suggestions (modification, addition, suppression, etc.)
>
> Once a consensus found, I will be able to start writing definitions that
> will be sent to you in order to have them validated as well.
>
> If this work arouses your interest, I would be glad to receive your
> comments.
>
> Best regards,
>
> Felipe Toussaint
>
>
>
> *_Tree_* :
>
> This tree is the final result of a large series of different trees!!
> This is a bi-branch tree dividing audio effect processors into two big
> groups: AMPLITUDE and TIME domains. They both represent the *action* of
> the processor on the signal: to _boost_ and/or _lower_ decibels of the
> original signal; to _delay_ the original signal.
>
> In order to be as precise as possible, I make for each effect processor
> an additional tree describing its devices and control parameters (not on
> the enclosed document).
>
> Furthermore, I try to be as neutral as possible while choosing terms,
> leaving aside analogue and digital domains and using terms like
> “modulator” instead of “LFO”, etc. (don’t hesitate to make any comment).
>
> 1. *AMPLITUDE domain* : in this category, we find processors that,
> in oreder to create a specific effect, will boost and lower the whole
> signal or a speicific frequency range. To do so, these processors use a
> number of devices (GAIN, FILTER, MODULATOR). A second categorization
> comes from these devices.
>
> a. *GAIN-BASED PROCESSORS* (boost or lower the whole signal)
>
> i.
> amplificateur (amplifier)
>
> ii.
> processeur de dynamique (dynamics processor)
>
> 1. compresseur (compressor)
>
> a. limiteur (limiter)
>
>
> i. écrêteur (clipper)
>
> 2. expandeur vers le haut (upward expander)
>
> 3. expandeur vers le bas (downward expander)
>
> a. porte de bruit (noise gate)
>
> _Devices_ : gain – détecteur de niveau (level detector)
>
> _Control parameters_ : seuil (threshold) – rapport (ratio) – temps
> d’attaque (attack) – temps de relâchement (release)
>
> *b. **FILTER-BASED PROCESSORS* (boost or lower, pass or cut, a
> specific range of frequencies)**
>
> i.
> processeur spectral (spectral processor)
>
> 1. filtre (filter)
>
> a. filtre passe-bas (low-pass filter)
>
> b. filtre passe-haut (high-pass filter)
>
> c. filtre passe-tout (all-pass filter)
>
> d. filtre passe-bande (band-pass filter)
>
> 2. égaliseur (equalizer)
>
> a. égaliseur paramétrique (parametric equalizer)
>
> b. égaliseur graphique (graphic equalizer)
>
> _Devices _: filters
>
> _Control parameters _: fréquence de coupure (cut-off frequency) – pente
> (slope) – gain (gain) – largeur de bande/facteur de qualité (bandwidth/Q
> factor)
>
> *c. **MODULATOR-BASED PROCESSOR*
>
> i.
> trémolo (tremolo)
>
> 2. *TIME domain:* in this category, we find processors
> that, in order to create a specific effect, will delay the input signal.
> (Most of them will mix the original version with the delayed one.)
> To do so, these processors use different devices (DELAY LINES, FILTERS).
> A second categorization comes from these devices :
>
> *a. **DELAY LINE BASED PROCESSORS :*
>
> i.
> Délai (delay)
>
> ii.
> écho de répétition (slapback)
>
> iii. double
>
> iv. écho
> (echo)
>
> v.
> réverbération (reverberation)
>
> _Devices _: ligne à retard (delay line) – régénération (feedback) –
> mélangeur (mixer)
>
> _Control parameters _: temps de retard (delay time) – taux de
> régénération (feedback gain) – mélange (mix)
>
> _Other concepts_ : signal retardé (wet signal) – signal original (dry
> signal)
>
> *
> b. **MODULATED DELAY LINE PROCESSORS*
>
> i. chorus
>
> ii. flanger
>
> iii. vibrato
>
> _Devices _: ligne à retard (delay line) – régénération (feedback) –
> modulateur (modulator) – mélangeur (mixer)
>
> _Control parameters _: temps de retard (delay time) – taux de
> régénération (feedback gain) – profondeur (depth) – vitesse (rate) –
> forme d’onde (wave shape) – mélange (mix)
>
> _Other concepts_ : signal retardé (wet signal) – signal original (dry
> signal)
>
>
>
> *c. **FILTER BASED PROCESSORS (time-varying filters)*
>
> i. phaser
>
> ii. wah-wah
>
> _Devices _: [wah-wah] filtre passe-bande (band-pass filter) – [phaser]
> filtre passe-tout (all-pass filter) – modulateur (modulator) -
> régénération (feedback) – mélangeur (mixer)
>
> _Control parameters _: profondeur (depth) – vitesse (rate) – forme
> d’onde (wave shape) – taux de régénération (feedback gain) - mélange (mix)
>
> _Other concepts_ : signal retardé (wet signal) – signal original (dry
> signal)
>
>
>
>
>
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