hi moh mor , here is how can you get the plot in dB
- Ensure that you have the Signal Processing Toolbox installed in MATLAB/Simulink, as it provides the necessary blocks for performing the FFT.
- In your Simulink model, locate the output signal from your analog-to-digital converter. If it's not already available as a Simulink block, you can use the "From Workspace" block to import the signal.
- Connect the output signal to the input of the "FFT" block from the Signal Processing Toolbox. This block computes the discrete Fourier transform (DFT) of the input signal.
- Connect the output of the "FFT" block to a "Complex to Magnitude-Angle" block. This block extracts the magnitude of the complex FFT output.
- Connect the magnitude output to a "dB" conversion block, also available in the Signal Processing Toolbox. This block converts the magnitude values to decibels.
- Finally, connect the output of the "dB" conversion block to a suitable display block, such as a "Scope" or a "To Workspace" block, to visualize or record the result.
