Signal Import and Export

R2026b

Interface with external signals

Using the file reader and writer System objects and blocks from DSP System Toolbox™, you can read and write data from audio files, binary files, and MAT files. The dsp.SignalSource object and blocks such as Signal From Workspace and To Workspace (Simulink) enable you to import and export signals from the MATLAB^® workspace. The UDP Send and Receive objects and blocks enable you to transmit data packets over the UDP network. You can also play audio on the sound card of your device using the Audio Device Writer object and block.

Objects

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File

`dsp.AudioFileReader`	Stream from audio file
`dsp.AudioFileWriter`	Stream to audio file
`dsp.BinaryFileReader`	Read data from binary file
`dsp.BinaryFileWriter`	Write data to binary files
`dsp.MatFileReader`	Read MAT file
`dsp.MatFileWriter`	Write MAT file

Workspace

dsp.SignalSource Import variable from workspace

Devices and Network

`audioDeviceWriter`	Play to sound card
`dsp.UDPReceiver`	Receive UDP packets from the network
`dsp.UDPSender`	Send UDP packets to network

Blocks

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File

	Binary File Reader	Read data from binary files
	Binary File Writer	Write data to binary files
	From Multimedia File	Stream from multimedia file
	To Multimedia File	Stream video frames and audio samples to multimedia file

Workspace

	From Workspace	Load signal data from workspace into Simulink model
	Signal From Workspace	Import signal from MATLAB workspace
	Triggered Signal From Workspace	Import signal samples from MATLAB workspace when triggered
	Triggered To Workspace	Write input sample to MATLAB workspace when triggered
	To Workspace	Log data to workspace from Simulink model

Devices and Network

	Audio Device Writer	Play to sound card
	UDP Receive	Receive UDP packets on a given IP port
	UDP Send	Send UDP message

Topics

Binary Files

Write and Read Binary Files
Use dsp.BinaryFileReader and dsp.BinaryFileWriter to read and write data to binary files.
Write and Read Matrix Data
Use dsp.BinaryFileReader and dsp.BinaryFileWriter to read and write matrix data to binary files.
Write and Read Fixed-Point Data
Write and read fixed-point data.
Write and Read Character Data
Write and read character data.
Write and Read Binary Files in Simulink
Write data to a binary file and read the same data in Simulink^®.
Write and Read Matrix Data from Binary Files in Simulink
Write matrix data to a binary file. Read the data as a real matrix and a complex matrix.
Write and Read Fixed-Point Data from Binary Files in Simulink
Write and read fixed-point data from a binary file.
Write and Read Character Data from Binary Files in Simulink
Write and read character data from a binary file.
Change the Endianness of the Data in Simulink
Change the endianness of the data in simulink.

Workspace

Import and Export Signals for Sample-Based Processing
Import signals from the MATLAB workspace into your DSP model and export signals from your signal processing model to the MATLAB workspace. The signals are configured for sample-based processing.
Import and Export Signals for Frame-Based Processing
Import signals from the MATLAB workspace into your signal processing model and export signals from your signal processing model to the MATLAB workspace. The signals are created for frame-based processing.

Devices and Network

Byte Transmission Using UDP
Use the dsp.UDPSender and dsp.UDPReceiver objects to send and receive UDP packets over the network.
Transmit Complex Data over UDP Network
Transmit complex STFT data over UDP network.
Data Transmission Using UDP in Simulink
Transmit and receive a sine wave signal over UDP network.
Decrease Underrun
Examine the Audio Device Writer block in a Simulink® model, determine underrun, and decrease underrun.