Spectrum analyzer block in Simulink - Mini Project: Build & Apply

Spectrum Analyzer Block in Simulink

📖 Scenario: You are working on a signal processing project where you need to visualize the frequency spectrum of a signal in Simulink. This helps you understand the signal's frequency components clearly.

🎯 Goal: Build a simple Simulink model that uses the Spectrum Analyzer block to display the frequency spectrum of a generated sine wave signal.

📋 What You'll Learn

Create a sine wave signal source with frequency 100 Hz

Add a Spectrum Analyzer block to visualize the signal's frequency spectrum

Configure the Spectrum Analyzer block with default settings

Run the simulation and observe the frequency spectrum output

💡 Why This Matters

🌍 Real World

Spectrum analyzers are used in audio processing, communications, and electronics to analyze signal frequencies.

💼 Career

Understanding how to use spectrum analyzers in Simulink is valuable for engineers working in signal processing and system design.

1

Create a sine wave signal source

Add a Sine Wave block to your Simulink model and set its frequency parameter to 100 Hz.

Simulink

% Add a Sine Wave block and set frequency to 100 Hz
% Your code here

Hint

Use add_block to add the Sine Wave block and set_param to set its frequency.

2

Add a Spectrum Analyzer block

Add a Spectrum Analyzer block from the DSP System Toolbox to your model.

Simulink

% Add a Spectrum Analyzer block
% Your code here

Hint

Use add_block with the path 'dsp/Spectrum Analyzer' to add the Spectrum Analyzer block.

3

Connect the Sine Wave block to the Spectrum Analyzer block

Connect the output port of the Sine Wave block to the input port of the Spectrum Analyzer block using add_line.

Simulink

% Connect Sine Wave output to Spectrum Analyzer input
% Your code here

Hint

Use add_line with source 'Sine Wave/1' and destination 'Spectrum Analyzer/1'.

4

Run the simulation and observe the output

Run the Simulink model simulation using sim('model') and observe the Spectrum Analyzer window showing the frequency spectrum.

Simulink

% Run the simulation
% Your code here

Hint

Use sim('model') to run the simulation.