Audio Para EQ CHOP

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Summary

The Audio Para EQ CHOP (parametric equalizer) applies up to 3 parametric filters to the incoming sound. The three filters are in series, where internally, the second filter takes its input from the output of the first filter, and so on.

It is called parametric because each filter has 3 controls - center frequency, bandwidth and boost, which in the old days, was more than usual analog filters.

Each filter has a center frequency (the Frequency parameter) where the filter will have the most effect, and a bandwidth which is roughly expressed in octaves, and is typically 3 or 4. The Boost parameter, when it is greater than 0, will make louder the audio around the center frequency. When boost is less than 0, it will make the audio quieter around the center frequency. Boost is in decibels (dB) where 0 dB has no effect.

You can best hear the effects of the Audio Para EQ CHOP by passing it rich-spectrum music. The Audio Para EQ CHOP is implemented with three 4-pole filters internally.

Input 2-4: See Frequency Modulation Channels, and the Scope parameter.

The Audio Para EQ CHOP is implemented as three 4-pole filters in series.

See Audio Filter CHOP, Audio Band EQ CHOP, Audio Spectrum CHOP, Audio Dynamics CHOP

PythonIcon.pngaudioparaeqCHOP_Class


Parameters - Parametric EQ Page

Frequency Units units - - How frequency is expressed:

  • Logarithmic logarithmic - The filter cutoff frequency can be expressed as a power-of-10. See Frequency (Hz = 10**val) below.
  • Frequency frequency - The filter cutoff frequency can be expressed in Hz.

Enable EQ1 enableeq1 - When off, it passes the sound through the first equalizer unchanged.

Boost (dB) EQ1 boost1 - When boost is greater than 0, it will make louder the audio around the center frequency. When boost is less than 0, it will make the audio quieter around the center frequency. Boost is in decibels (dB) where 0 dB has no effect.  

Frequency (Hz=10**val) EQ1 frequencylog1 - The frequency is expressed in power-of-10, where value 0 translates to 1 Hz (10**0), value 1 is 10 Hz (10**1), value 2 is 100 Hz (10**2), value 3 is 1000 Hz, value 4 is 10,000 Hz, value 4.5 is 31,623 Hz. The parameter in this form gives more meaningful range in relation to human hearing, as increasing the parameter by 1 raises the frequency by about 3 octaves.  

Frequency (Hz) EQ1 frequencyhz1 - The filter frequency is expressed in Hz (cycles per second). This parameter set to 1000 has exactly the same effect as the above parameter set to 3.  

Bandwidth EQ1 bandwidth1 - Bandwidth determines how much the levels decrease near the center frequency, expressed in octaves.  

Enable EQ2 enableeq2 - When off, it passes the sound through the second equalizer unchanged.

Boost (dB) EQ2 boost2 - When boost is greater than 0, it will make louder the audio around the center frequency. When boost is less than 0, it will make the audio quieter around the center frequency. Boost is in decibels (dB) where 0 dB has no effect.  

Frequency (Hz=10**val) EQ2 frequencylog2 - The frequency is expressed in power-of-10, where value 0 translates to 1 Hz (10**0), value 1 is 10 Hz (10**1), value 2 is 100 Hz (10**2), value 3 is 1000 Hz, value 4 is 10,000 Hz, value 4.5 is 31,623 Hz. The parameter in this form gives more meaningful range in relation to human hearing, as increasing the parameter by 1 raises the frequency by about 3 octaves.  

Frequency (Hz) EQ2 frequencyhz2 - The filter frequency is expressed in Hz (cycles per second). This parameter set to 1000 has exactly the same effect as the above parameter set to 3.  

Bandwidth EQ2 bandwidth2 - Bandwidth determines how much the levels decrease near the center frequency, expressed in octaves.  

Enable EQ3 enableeq3 - When off, it passes the sound through the third equalizer unchanged.

Boost (dB) EQ3 boost3 - When boost is greater than 0, it will make louder the audio around the center frequency. When boost is less than 0, it will make the audio quieter around the center frequency. Boost is in decibels (dB) where 0 dB has no effect.  

Frequency (Hz=10**val) EQ3 frequencylog3 - The frequency is expressed in power-of-10, where value 0 translates to 1 Hz (10**0), value 1 is 10 Hz (10**1), value 2 is 100 Hz (10**2), value 3 is 1000 Hz, value 4 is 10,000 Hz, value 4.5 is 31,623 Hz. The parameter in this form gives more meaningful range in relation to human hearing, as increasing the parameter by 1 raises the frequency by about 3 octaves.  

Frequency (Hz) EQ3 frequencyhz3 - The filter frequency is expressed in Hz (cycles per second). This parameter set to 1000 has exactly the same effect as the above parameter set to 3.  

Bandwidth EQ3 bandwidth3 - Bandwidth determines how much the levels decrease near the center frequency, expressed in octaves.  

Dry / Wet Mix drywet -  



Parameters - Common Page

Time Slice timeslice - Turning this on forces the channels to be "Time Sliced". A Time Slice is the time between the last cook frame and the current cook frame.

Scope scope - To determine which channels get affected, some CHOPs use a Scope string on the Common page.

Sample Rate Match srselect - - Handle cases where multiple input CHOPs' sample rates are different. When Resampling occurs, the curves are interpolated according to the Interpolation Method Option, or "Linear" if the Interpolate Options are not available.

  • Resample At First Input's Rate first - Use rate of first input to resample others.
  • Resample At Maximum Rate max - Resample to the highest sample rate.
  • Resample At Minimum Rate min - Resample to the lowest sample rate.
  • Error If Rates Differ err - Doesn't accept conflicting sample rates.

Export Method exportmethod - - This will determine how to connect the CHOP channel to the parameter. Refer to the Export article for more information.

  • DAT Table by Index datindex - Uses the docked DAT table and references the channel via the index of the channel in the CHOP.
  • DAT Table by Name datname - Uses the docked DAT table and references the channel via the name of the channel in the CHOP.
  • Channel Name is Path:Parameter autoname - The channel is the full destination of where to export to, such has geo1/transform1:tx.

Export Root autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is Path:Parameter are relative to.

Export Table exporttable - The DAT used to hold the export information when using the DAT Table Export Methods (See above).



Frequency Modulation Channels Input

The second input is the Frequency Modulation Channels, which allows the filter parameters to be changed within the CHOP's time slice interval (typically 1/60 sec). This prevents audible stepping of the parameters that you are changing quickly.

You can send in a channel called frequency to override the value of the parameter. You would do this if you want to adjust the center frequency very quickly. The parameter can only change as fast as the timeline rate, typically 1/60 seconds. Changed quickly, the stepping in frequency is noticable. To improve on that, you would send a frequency channel in that is at a higher sample rate, like 400, which you can set in a CHOP like an LFO CHOP.



CHOPs
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An Operator Family which operate on Channels (a series of numbers) which are used for animation, audio, mathematics, simulation, logic, UI construction, and many other applications.

A parameter in most CHOPs that restricts which channels of that CHOP will be affected. Normally all channels of a CHOP are affected by the operator.

A Time Slice is the time from the last cook frame to the current cook frame. In CHOPs it is the set of short channels that only contain the CHOP channels' samples between the last and the current cook frame.

samples-per-second of a CHOP. Each CHOP in your network has a sample rate, whether it is used or not. The overall timeline has a "frame rate", which is the number of animation frames per second, generally your monitor display frequency.

Exporting is the connection of CHOP channels to parameters of operators. The output of each exporting CHOP is one or more channels, active only while the CHOP Viewer is on. The current value of a channel can be exported to a parameter of any operator, overriding that parameter's value. See Parameter.

An Operator Family that manipulates text strings: multi-line text or tables. Multi-line text is often a command Script, but can be any multi-line text. Tables are rows and columns of cells, each containing a text string.

The location of an operator within the TouchDesigner environment, for example, /geo1/torus1, a node called torus1 in a component called geo1. The path / is called Root. To refer instead to a filesystem folder, directory, disk file or http: address, see Folder.

Parameters in TouchDesigner are an operator's settings (numbers, menus, flags, strings, paths) which the user can alter. Parameters for any operator can be opened by right-clicking on the operator and selecting "Parameters..." A currently selected operator's parameters can be viewed in a Network Editor by pressing the keyboard shortcut 'p'.

TouchDesigner is a hierarchy of components. "root" is the top-most network in the hierarchy. The Path is simply /. A typical path is /project1/moviein1.