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Quadrature-to-directional format conversion of Doppler signals using digital methods
1Division of Medical Physics, Faculty of Medicine, Leicester University, UK.
Physiological Measurement
|May 1, 1994
Summary
Four digital methods convert quadrature to directional formats, including phasing-filter and complex FFT. Practical implementations confirm these techniques effectively separate time and frequency domain outputs for real-time processing.
Area of Science:
- Digital Signal Processing
- Communications Engineering
Background:
- Quadrature signals are fundamental in modern communication systems.
- Efficient conversion to directional formats is crucial for signal analysis and processing.
Purpose of the Study:
- To describe and evaluate four digital techniques for quadrature-to-directional format conversion.
- To verify theoretical concepts through practical, real-time implementations.
Main Methods:
- Phasing-filter technique
- Extended Weaver receiver technique
- Hilbert transform in the frequency domain
- Complex Fast Fourier Transform (FFT)
Main Results:
- All four methods successfully produced separated time and frequency domain outputs.
- Theoretical models were validated by practical experimental results.
- Real-time implementation was achieved using a digital signal processing board.
Conclusions:
- The described digital techniques offer viable solutions for quadrature-to-directional format conversion.
- Practical implementation confirms the effectiveness and real-time capability of these methods.