title: Quadrature-to-directional format conversion of Doppler signals using digital methods.
abstract: Four possible quadrature-to-directional format conversion methods using digital techniques are described. These are the phasing-filter technique, the extended Weaver receiver technique, the Hilbert transform in the frequency domain, and the complex FFT. All methods are implemented to give separated time domain outputs as well as frequency domain outputs. The theoretical descriptions are verified by practical implementations. Each of the methods has been implemented in real-time using a commercially available digital signal processing board.
authors.affiliation: Division of Medical Physics, Faculty of Medicine, Leicester University, UK.
authors.forename: N
authors.initials: N
authors.lastname: Aydin
authors.forename: L
authors.initials: L
authors.lastname: Fan
authors.forename: D H
authors.initials: DH
authors.lastname: Evans
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D005583:Fourier Analysis; D014465:Ultrasonics