Audio Para EQ CHOP

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Summary
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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 - As this parameter is reduced from 1 (Wet) toward 0 (Dry), it removes the effect of the filter.


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. See Pattern Matching.

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.


Operator Inputs

  • Input 0: -
  • Input 1: -
  • Input 2: -
  • Input 3: -


Info CHOP Channels

Extra Information for the Audio Para EQ CHOP can be accessed via an Info CHOP.

Common CHOP Info Channels

  • start - Start of the CHOP interval in samples.
  • length - Number of samples in the CHOP.
  • sample_rate - The samplerate of the channels in frames per second.
  • num_channels - Number of channels in the CHOP.
  • time_slice - 1 if CHOP is Time Slice enabled, 0 otherwise.
  • export_sernum - A count of how often the export connections have been updated.

Common Operator Info Channels

  • total_cooks - Number of times the operator has cooked since the process started.
  • cook_time - Duration of the last cook in milliseconds.
  • cook_frame - Frame number when this operator was last cooked relative to the component timeline.
  • cook_abs_frame - Frame number when this operator was last cooked relative to the absolute time.
  • cook_start_time - Time in milliseconds at which the operator started cooking in the frame it was cooked.
  • cook_end_time - Time in milliseconds at which the operator finished cooking in the frame it was cooked.
  • cooked_this_frame - 1 if operator was cooked this frame.
  • warnings - Number of warnings in this operator if any.
  • errors - Number of errors in this operator if any.


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