Audio Capture Interface

Simulate capture of sample from audio stream on hardware

Since R2021a

• 

Libraries:
SoC Blockset / Peripherals

Description

The Audio Capture Interface block simulates the behavior of an audio input device. The block outputs audio samples as a message to a connected Audio Capture block that simulates audio driver code and connects to your algorithm. The block can also emit an event that, when connected to a Task Manager block, can trigger a task containing the Audio Capture block.

Ports

Input

data — Data frame from captured audio

M-element vector | M-by-C matrix

To provide a single audio channel, specify this data as an M-element audio data frame, where M defines the number of samples of audio data per frame. To provide multiple audio channels provided, specify data as an M-by-C matrix, where C defines the number of channels.

Dependencies

To enable this port, set the Input parameter to From input port.

Data Types: int8 | int16 | int32

Output

event — Task event signal

scalar

This port sends a message after a frame of audio samples is captured for all channels. This output connects to the input of the Task Manager block to execute the associated event-driven task.

Dependencies

To enable this port, select the Show event port parameter.

Data Types: rteEvent

msg — SoC message data

scalar

This port outputs data messages containing audio data to a connected Audio Capture block.

Data Types: SoCData

Parameters

Input — Source of simulated audio data

From dialog (default) | From input port | From timeseries object

Specify the source of the simulated audio data.

Value — Audio data to be output

int16([1 2 3 4 5 6 7 8]) (default) | CN-length vector

Specify the audio data as a CN-length vector representing the audio frames for all channels, where N is the number of samples per frame and C is the number of audio channels. The samples for each channel are contiguous.

Object name — Timeseries object

[ ] (default) | MATLAB workspace variable

Specify the audio data as a timeseries object defined in the MATLAB^® workspace.

Sample time — Sample time in seconds

-1 (default) | positive scalar

Enter the sample time defining the rate at which to output the message containing audio data.

Show event port — Option to enable task event ports

off (default) | on

Select this parameter to enable an event port that, when connected to the Task Manager block, can execute event-driven tasks.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

To automatically generate C code for your design, and execute on an SoC device, use the SoC Builder tool. To generate and execute C code for your SoC models, Embedded Coder^® features are required. For more information on generating code for SoC designs, see Use SoC Builder to Generate SoC Design.

Embedded Coder does not generate code for this block. In the generated code, the advanced Linux sound architecture (ALSA) driver framework performs audio capture on the device. The related Audio Capture block represents the ALSA driver. For more information on the ALSA driver framework, see the Advanced Linux Sound Architecture website.

Version History

Introduced in R2021a