Delta Modulation and Demodulation

This repository demonstrates the implementation of Delta Modulation (DM) and Delta Demodulation (DD) using Python. Delta Modulation is a method for digitizing analog signals, particularly suited for low-bandwidth communication systems. The project also includes signal reconstruction with a Low-Pass Filter (LPF) to improve accuracy.

Example Results

Below is an example output from the Delta Modulation and Demodulation process:

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Features

• Delta Modulation: Encodes analog signals into a binary sequence using a fixed step size.
• Delta Demodulation: Decodes the binary sequence to reconstruct the original signal.
• Low-Pass Filtering: Smooths the reconstructed signal to remove high-frequency noise.
• Visualization:
  • Original signal.
  • Delta modulated signal.
  • Reconstructed signal (before and after LPF).
  • Signal comparisons (original vs. reconstructed).

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How It Works

Delta Modulation

1. Compares the current input signal with the last quantized value.
2. Outputs 1 if the input is larger, adding a step size to the quantized value.
3. Outputs 0 if the input is smaller, subtracting a step size.
4. Generates a binary sequence and a staircase approximation of the signal.

Delta Demodulation

1. Processes the binary sequence to reconstruct the signal.
2. Cumulatively adds or subtracts the step size based on the binary values.

Low-Pass Filtering

1. Applies a Butterworth Low-Pass Filter to the reconstructed signal.
2. Removes high-frequency components, making the signal closely resemble the original.

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Getting Started

1. Clone the Repository

git clone https://github.com/your-username/DeltaModulation-Demodulation.git
cd DeltaModulation-Demodulation

2. Install Dependencies

Make sure Python and pip are installed. Install the required libraries:

pip install -r requirements.txt

3. Run the Script

Execute the main script to visualize the Delta Modulation and Demodulation process:

python delta_modulation.py

4. Outputs

The script generates the following plots:

• Original Signal
• Delta Modulated Signal
• Reconstructed Signal
• Reconstructed Signal (after LPF)
• Signal Comparisons (Original vs. Reconstructed)