Realtime Digital Filter Design

Description

This project involves implementing a desktop application to help users design custom digital filters through the placement of zeros and poles on the z-plane. The application visualizes the filter's frequency response and allows for real-time filtering of signals.

Table of Contents

1. Features
2. Installation
3. Usage
4. Dependencies
5. Contributors

Features

Z-Plane Plot

• Unit Circle Display: The plot includes a unit circle where users can place zeros and poles.
• Interactive Modifications:
  • Drag and Drop: Modify placed zeros/poles by dragging them.
  • Deletion: Click on a zero or pole to delete it.
  • Clear Options: Clear all zeros, all poles, or both.
  • Conjugate Addition: Option to add conjugates for complex elements.

Frequency Response Plot

• Magnitude and Phase Response: Separate plots for magnitude and phase response corresponding to the placed zeros and poles.

Real-time Signal Filtering

• Signal Application: Apply the designed filter on a lengthy signal (minimum 10,000 points).

  • Time Progress Visualization: Graphs showing the time progress of the signal and the filtered signal.
  • Speed Control: Slider to control the speed/temporal resolution of the filtering process.

• Real-time Signal Input: Input an arbitrary real-time signal via mouse movements.

  • Frequency Variation: Faster mouse movements generate higher frequencies, slower movements generate lower frequencies.

  

Phase Correction with All-Pass Filters

• All-Pass Filter Library: Visualize and select from a library of all-pass filters.
• Custom All-Pass Filter: Build a custom all-pass filter by providing an arbitrary value.
• Enable/Disable All-Pass Filters: Enable or disable added all-pass elements via a drop-menu or checkboxes group.

Installation

To install the project, clone the repository and install the requirements:

# Clone the repository
git clone https://github.com/omarshaban02/filter-forge.git

# Navigate to the project directory
cd filter-forge

# Install the required packages:
pip install -r requirements.txt

# Run the application:
python index.py

Usage

1. Open the Application: Run main.py to start the application.

2. Design Filte:

• Use the z-plane plot to place zeros and poles.
• Modify or delete placed elements as needed.

3. Visualize Response: View the magnitude and phase response plots.

4. Apply Filter:

• Apply the designed filter on a lengthy signal and observe the real-time filtering process.
• Input a real-time signal via mouse movements.

5. Phase Correction:

• Select or build all-pass filters for phase correction.
• Enable or disable all-pass filters as needed.

Dependencies

This project requires the following Python packages listed in the requirements.txt file:

• PyQt5
• opencv
• numpy
• pandas

Contributors

Abdulrahman Shawky

Omar Abdulnasser

Ahmed Kamal

Abdullah Omran