# Resample CHOP

## Summary

The Resample CHOP resamples an input's channels to a new sample rate and/or start/end interval. In all cases, the entire input interval is resampled to match the output interval.

Resample does a simple linear interpolation of the Time Slice in Time Slicing mode. Only the sample rate can be changed.

## Parameters - Resample Page

Method `method` - - The resample method to apply to the channels:

• Same Rate, New Interval `strech` - Stretches or compresses the channels like the Stretch CHOP.
• New Rate, Same Time Range `preserve` - Changes the sample rate without changing the time-length of the CHOP.
• New Rate, Same Index Range `index` - Changes the sample rate without changing the number of samples in the CHOP.
• New Rate, New Interval `newint` - Changes both the sample rate and stretches/compresses the CHOP.

Sample Rate `rate` - The new sample rate.

Unit Values `relative` - - Determines how the Start/End parameters are interpreted.

• Absolute `abs` - The value is the new start/end position.
• Relative to Start/End `rel` - The value is a shift from the old start/end position.
• Relative to Current Frame `cur` -

Start `start` - The CHOP's new start position.

Start Unit `startunit` -

End `end` - The CHOP's new end position.

End Unit `endunit` -

Quaternion Blend `quatrot` - Uses quaternions to blend between samples.

Interpolation `interp` - - The interpolation method to use when resampling:

• No Interpolation `nointerp` - Use the value of the nearest sample.
• Linear `linear` - Use linear interpolation between samples when the output has more samples. Averages all samples near the new sample when the output has fewer samples.
• Cubic `cubic` - Cubically interpolates between samples, for smoother curves than Linear. This method is not recommended for channels with sharp changes.
• Pulse Preserve `edge` - A linear interpolation that recognizes single sample pulses and preserves their height and one-sample width. A pulse is a non-zero value proceeded and followed by zero-value samples.

Constant Area `constarea` - If enabled, keeps the area under the channel constant by scaling the values of the channel.

Correct for Cycles `correct` - If enabled, compensates for cyclic channels (such as angles) by always choosing the shortest step between samples, like 360 to 0 for angles.

Cycle Length `cyclelen` - The length of the cycle. 360 is typical for angles.

## 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).

## Operator Inputs

• Input 0 -
• Input 1 -

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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 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.

The term "Frame" is used (1) in the Timeline, (2) as a time-unit in CHOPs, (3) as a time-unit in TOPs, and (4) with movies images which are read and created with TOPs.

To pulse a parameter is to send it a signal from a CHOP or python or a mouse click that causes a new action to occur immediately. A pulse from a CHOP is typically a 0 to 1 to 0 signal in a channel, and a pulse via python is via a `.pulse()` call on a pulse-type parameter, such as Reset in a Speed CHOP.

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.

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`.