Mobile Sensor Signal Analysis (MATLAB)

This project analyzes motion signals recorded using MATLAB Mobile and processed inside MATLAB.

✅ Main Goals

• Record magnetic / motion sensor data by phone
• Preprocess the signal and remove noise
• Convert sampling from 50Hz → 100Hz
• Extract and visualize:
  • Single-sided amplitude spectrum (FFT)
  • Dominant frequency
  • Spectrogram
• Compare pendulum/string lengths (52cm, 77cm, 108cm) and show how length affects frequency

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📁 Included Files

File	Description
DSP_project.mlx	Main MATLAB Live Script containing the full analysis
acceleration_77cm.mat	Sensor log (77cm experiment)
sensor_108.mat	Sensor log (108cm experiment)
sensorlog_40cm.mat	Sensor log (40cm experiment)
עיבוד אותות סופי.pdf	Final signal processing report

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📊 What the script does

✔ Loads data from the MATLAB Mobile sensor logs
✔ Filters the signal and performs basic noise removal
✔ Resamples signal from 50Hz to 100Hz
✔ Calculates FFT and dominant frequency
✔ Displays the spectrum and spectrogram
✔ Compares results between different pendulum lengths

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🔧 Requirements

• MATLAB R2021+
• Signal Processing Toolbox (FFT/spectrogram functions)

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✍ Author

Mohamad Mashal
Electrical & Electronics Engineering
Specialization: DSP, Communications & Signal Processing