Matlab audio plugin examples

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Matlab audio plugin examples

Documentation Help Center. It also specifies interface attributes, such as naming. See audioPluginParameter for more details. Add a constant property, PluginInterfacewhich is specified as an audioPluginInterface object. Create a basic audio plugin class definition file. Specify a property, Gainand a processing function that multiplies input by Gain. Pass audioPluginParameter to audioPluginInterface.

To associate the plugin property, Gainto a plugin parameter, specify the first argument of audioPluginParameter as the property name, 'Gain'. If you generate and deploy myAudioPlugin to a digital audio workstation DAW environment, the plugin property, Gainsynchronizes with a user-facing plugin parameter. Specify the plugin name, vendor name, vendor version, unique identification, number of input channels, number of output channels, and a yellow background.

Audio plugin parameters, specified as one or more audioPluginParameter objects. To create an audio plugin parameter, use the audioPluginParameter function. In a digital audio workstation DAW environment, audio plugin parameters synchronize plugin class properties with user-facing parameters. Audio plugin grid layout, specified as an audioPluginGridLayout object.

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1, Name of your generated plugin, as seen by a host audio application, specified as a comma-separated pair consisting of 'PluginName' and a character vector or string of up to characters.

If 'PluginName' is not specified, the generated plugin is given the name of the audio plugin class it is generated from. Vendor name of the plugin creator, specified as the comma-separated pair 'VendorName' and a character vector of up to characters. Vendor version used to track plugin releases, specified as a comma-separated pair consisting of 'VendorVersion' and a dot-separated character vector or string of 1—3 integers in the range 0 to 9.

matlab audio plugin examples

Unique identifier for your plugin, specified as a comma-separated pair consisting of 'UniqueID' and a four-element character vector or string, used for recognition in certain digital audio workstation DAW environments. Input channels, specified as a comma-separated pair consisting of 'InputChannels' and an integer or vector of integers. The input channels are the number of input data arguments and associated channels columns passed to the processing function of your audio plugin.

Example: 'InputChannels',3 calls the processing function with one data argument containing 3 channels. Example: 'InputChannels',[2,4,1,5] calls the processing function with 4 data arguments.

The first argument contains 2 channels, the second contains 4 channels, the third contains 1 channel, and the fourth contains 5 channels. Output channels, specified a comma-separated pair consisting of 'OutputChannels' and an integer or vector of integers. The output channels are the number of input data arguments and associated channels columns passed from the processing function of your audio plugin. Example: 'OutputChannels',3 specifies the processing function to output one data argument containing 3 channels.

Example: 'OutputChannels',[2,4,1,5] specifies the processing function to output 4 data arguments.

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See ColorSpec Color Specification for details. Data Types: single double int8 int16 int32 int64 uint8 uint16 uint32 uint64 logical char string. Image used for GUI background, specified by its file name using either a character vector or string.

If the file is not on path, you must specify the full file path. The background image may include transparencies, in which case the BackgroundColor is used.

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Example: 'BackgroundImage','Sunrise.Documentation Help Center. Search the plugin descriptions to find an example that meets your needs. Name: audiopluginexample. Type: Basic plugin. Description: Adds an audio chorus effect. The chorus effect is implemented by modulating two delay lines.

Features Used: dsp. VariableFractionalDelayaudioOscillator. Description: Implements an audio echo effect using two delay lines. Description: Implements an audio flanging effect using a modulated delay line. Description: Implements a low frequency oscillator LFO controlled lowpass filter. The LFO controls the cutoff frequency of the lowpass filter.

Tunable Filtering and Visualization Using Audio Plugins

The plugin user tunes the type of control signal, and its frequency, amplitude, and DC offset. The plugin user also tunes the Q factor of the lowpass filter. Design Patterns: enum helper class for enum parameter mapping, log parameter mapping, real-time visualization, waveform design with UI.

Real-time Audio Prototyping with MATLAB - VST plug-in generation and more

Features Used: audioOscillatorwavetableSynthesizerdsp. Description: Implements an audio phaser effect.

matlab audio plugin examples

Design Patterns: plugin composition. Description: Implements a pitch-shifting algorithm using cross-fading between two channels with time-varying delays and gains. Description: Implements an audio strobing effect. Tunable parameters of the plugin include the strobe period, the strobe fill, a relative level threshold for implementing the effect, and the ability to synchronize the strobe period with the audio signal dynamics. Design Patterns: logical parameters, enum helper class for enum parameter mapping.

Features Used: audioOscillator. Description: Implements a bandpass filter using a second-order IIR filter. The plugin parameters are the center frequency and Q-factor. Features Used: filter. Type: System object plugin.Documentation Help Center.

Use audio source plugins to produce audio signals. To create a valid audio source plugin, in your class definition file, subclass your object from the audioPluginSource class.

A valid audio source plugin is one that can be deployed in a digital audio workstation DAW environment. To validate it, use the validateAudioPlugin function.

To generate it, use the generateAudioPlugin function. A basic audio source plugin inherits from the audioPluginSource class but not the matlab. System class. Define a basic audio source plugin class that inherits from audioPluginSource. All valid audio source plugins include a processing function. For basic audio source plugins, the processing function is named process.

The processing function defines the audio signal that your plugin outputs. Audio source plugins do not accept audio signals as input to the processing function. The default audio plugin interface assumes a stereo output.

Specify the processing output as a matrix with two columns. These columns correspond to the left and right channels of a stereo signal. The number of rows in the output matrix correspond to the frame size. The output frame size must match the frame size of the environment in which the plugin is run.

A DAW environment has variable frame size. To determine the current environment frame size, call getSamplesPerFrame in the process function. Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:. Select the China site in Chinese or English for best site performance. Other MathWorks country sites are not optimized for visits from your location. Get trial now.

Toggle Main Navigation. Search Support Support MathWorks.Documentation Help Center. An audio plugin encapsulates an audio processing algorithm and enables you to tune the parameters of the algorithm while streaming audio. Create a class definition that inherits from audioPlugin. Parameterize the stereo width of the processing algorithm by defining the public property Width.

Enable users to tune the stereo width by defining an audioPluginInterface that contains Width as an audioPluginParameter. Define the audio processing by creating a process method. The process method takes the audio input, inand adjusts the stereo width by: a applying mid-side encoding, b adjusting the stereo width based on the user-controlled Width parameter, and then c applying mid-side decoding.

Once you have defined an audio plugin, you can prototype it using the Audio Test Bench app. The Audio Test Bench app enables you to stream audio through the plugin while you tune parameters, perform listening tests, and visualize the original and processed audio. You can also validate and generate the plugin from the command line by using the validateAudioPlugin and generateAudioPlugin functions. Once generated, you can deploy your plugin to a digital audio workstation DAW.

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matlab audio plugin examples

Off-Canvas Navigation Menu Toggle. Define an Audio Plugin To define a plugin that enables users to adjust stereo width: Create a class definition that inherits from audioPlugin. Checking plug-in class 'StereoWidth' Running testbench Running mex testbench Deleting testbench. Ready to generate audio plug-in. No, overwrite the modified version Yes.Documentation Help Center. See Supported Compilers for a list of compilers supported by generateAudioPlugin.

matlab audio plugin examples

Options can be specified in any grouping, and in any order. A VST 2 plugin with file name Echo is saved to your current folder. The extension of your plugin depends on your operating system.

A VST 2 plugin with file name awesomeEffect is saved to your current folder. A bit VST 2 plugin with file name Echo. To generate a binary standalone executable, use the -exe option.

The following command saves Echo.

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Configure audio input and output from the plugin. Synchronizing parameters with MIDI devices is not currently supported. Generates a standalone executable for your audio plugin. When you evaluate the generated code, the UI you defined in your audio plugin opens. You can control the input to your plugin and the output from your plugin using Options.

You can use the generated zip file to modify the generated plugin or compile it to a format other than VST 2. Specifies the file name of the generated plugin or zip file.

The appropriate extension is appended to the fileName based on the platform on which the plugin or zip file is generated. By default, the plugin or zip file is named after the class. Generates a plugin or zip file to a specific folder. By default, the generated plugin is placed in the current folder.

If folder is not in the current folder, specify the exact path. Name of the plugin class to generate. It must derive from either the audioPlugin class or the audioPluginSource class. You can specify the plugin class to generate by specifying its class name or file name.

For example, the following syntaxes perform equivalent operations:. If you want to specify the plugin class by file name, and your plugin class is inside a package, you must specify the package as a file path.

Design an Audio Plugin

Build problems can occur when using folder names with spaces. The extension of your generated VST plugin depends on your operating system. A modified version of this example exists on your system.

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Do you want to open this version instead? Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:. Select the China site in Chinese or English for best site performance. Other MathWorks country sites are not optimized for visits from your location.

Get trial now.Documentation Help Center. Options to modify test bench procedure, specified as -nomex or -keeptestbench. Options can be specified together or separately, and in any order.

This option significantly reduces run time of the test bench procedure. Name of the plugin class to validate. The plugin class must derive from either the audioPlugin class or the audioPluginSource class. The validateAudioPlugin function exercises an instance of the specified plugin class.

You can specify the plugin class to validate by specifying its class name or file name. For example, the following syntaxes perform equivalent operations:.

If you want to specify the plugin class by file name, and your plugin class is inside a package, you must specify the package as a file path.

The validateAudioPlugin function uses dynamic testing to find common audio plugin programming mistakes not found by the static checks performed by generateAudioPlugin. The function:. If the plugin class fails testing, step 4 is automatically omitted. To debug your plugin, step through the saved generated test bench. If you use the -keeptestbench option, or if an error occurs during validation, the test bench files are saved to your current folder.

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Ambisonic Plugin Generation

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Syntax validateAudioPlugin classname. Examples collapse all Validate Audio Plugin. Checking plug-in class 'audiopluginexample. Running testbench Running mex testbench Deleting testbench. Ready to generate audio plug-in. Skipping mex. Keep Test Benches After Validation. Keeping testbench. Input Arguments collapse all options — Options to modify test bench procedure -nomex -keeptestbench.Documentation Help Center. Ambisonics is a spatial audio technique which represents a three-dimensional sound field using spherical harmonics.

This example contains an encoder plugin, a function to generate custom encoder plugins, a decoder plugin, and a function to generate custom decoder plugins. The customization of plugin generation enables a user to specify various ambisonic orders and various device lists for a given ambisonic configuration.

Ambisonic encoding is the process of decomposing a sound field into spherical harmonics. The encoding matrix is the amount of spherical harmonics present at a specific device position. In mode-matching decoding, the decoding matrix is the pseudo-inverse of the encoding matrix. Ambisonic decoding is the process of reconstructing spherical harmonics into a sound field.

This example involves higher order ambisonics, which include traditional first-order ambisonics. In ambisonics, there is a relationship between the number of ambisonic channels and the ambisonic order:.

For example: First-order ambisonics requires four audio channels while fourth-order ambisonics requires 25 audio channels.

The ambisonic design examples support up to seventh-order ambisonics with pseudo-inverse decoding. Ambisonic devices are divided into two groups: elements and speakers. Each device has an audio signal and metadata describing its position and operation.

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Elements correspond to multi-element microphone arrays, and speakers correspond to loudspeaker arrays for ambisonic playback. The ambisonic encoder applies the ambisonic encoding matrix to raw audio from microphone elements. The position azimuth, elevation and deviceType of the microphone elements along with desired ambisonic order are needed to create the ambisonic encoding matrix. The ambisonic decoder applies the ambisonic decoding matrix to ambisonic audio for playback on speakers.

The position azimuth, elevation and deviceType of the speakers along with desired ambisonic order are needed to create the ambisonic decoding matrix. In order to capture, represent, or reproduce a sound field with ambisonics, the number of devices elements or speakers must be greater than or equal to the number of ambisonic channels. For the encoding example, audio captured with a channel spherical array microphone may be encoded up to fourth-order ambisonics 25 channels.

For the decoding example, a loudspeaker array containing 64 speakers is configured for ambisonic playback up to seventh-order. If the playback content is fourth order ambisonics, then even though the array is set up for seventh- order, only fourth-order ambisonics is realized through the system.


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