Audio processing model in Simulink - Mini Project: Build & Apply

Audio Processing Model

📖 Scenario: You are working on a simple audio processing model using Simulink. The goal is to create a model that takes an audio signal, applies a gain (volume adjustment), and outputs the processed audio signal.

🎯 Goal: Build a Simulink model that inputs an audio signal, applies a gain factor, and outputs the adjusted audio signal.

📋 What You'll Learn

Create an audio input block with a predefined signal

Add a gain block with a configurable gain value

Connect the blocks correctly to process the audio signal

Display the output signal using a scope block

💡 Why This Matters

🌍 Real World

Audio processing models are used in music production, hearing aids, and communication devices to adjust sound signals.

💼 Career

Understanding how to build and simulate audio processing models in Simulink is useful for roles in signal processing, embedded systems, and audio engineering.

1

Create the audio input signal

Create a From Workspace block named audioIn that loads the variable audioSignal from the workspace. The variable audioSignal should be a 1D array with values [0, 0.5, 1, 0.5, 0, -0.5, -1, -0.5].

Simulink

# Create the variable audioSignal in the workspace
# Your code here

Hint

Use a simple array assignment in MATLAB workspace to create audioSignal.

2

Add the gain configuration

Create a variable called gainValue in the workspace and set it to 2. This will be used to control the volume of the audio signal.

Simulink

audioSignal = [0, 0.5, 1, 0.5, 0, -0.5, -1, -0.5];
# Create the gainValue variable and set it to 2
# Your code here

Hint

Just assign the number 2 to the variable gainValue in the workspace.

3

Build the core audio processing model

In Simulink, add a Gain block and set its gain parameter to gainValue. Connect the output of the audioIn block to the input of the Gain block.

Simulink

audioSignal = [0, 0.5, 1, 0.5, 0, -0.5, -1, -0.5];
gainValue = 2;
# Add Gain block with gainValue and connect audioIn to Gain
# Your code here

Hint

Use the Gain block parameter to link to the workspace variable gainValue.

4

Display the processed audio output

Add a Scope block in Simulink and connect the output of the Gain block to the input of the Scope block. Run the simulation and print the processed audio signal values.

Simulink

audioSignal = [0, 0.5, 1, 0.5, 0, -0.5, -1, -0.5];
gainValue = 2;
# Add Scope block and connect Gain output to Scope input
# Run simulation and print processed audio signal
# Your code here

Hint

Multiply the original audioSignal by gainValue to get the processed audio and print it.