Title :
Bidirectional Doppler signal analysis based on a single RF sampling channel
Author :
Tortoli, Piero ; Bessi, L. ; Guidi, Francesco
Author_Institution :
Dept. of Electron. Eng., Florence Univ., Italy
Abstract :
Recent introductions of low-cost high-performance devices have finally made feasible the implementation of "undersampling" techniques in different application areas. A significant example is represented by Doppler analysis, which typically involves the inspection of narrowband spectra around an RF carrier. This letter describes the implementation of an aliasing-free CW ultrasound Doppler system employing a "single" undersampling channel, in place of the two "quadrature" sampling channels already proposed by other authors. Implications in terms of clutter rejection are also discussed.<>
Keywords :
Doppler effect; acoustic signal processing; analogue-digital conversion; biomedical ultrasonics; clutter; demodulation; RF carrier; aliasing-free CW ultrasound Doppler system; bidirectional Doppler signal analysis; blood flow; clutter rejection; human carotid artery; low-cost high-performance devices; narrowband spectra; single RF sampling channel; single undersampling channel; undersampling techniques; Bandwidth; Demodulation; Digital signal processing; Inspection; Narrowband; RF signals; Radio frequency; Sampling methods; Signal analysis; Ultrasonic imaging;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
