Abstract
In ultrasound Doppler systems, directional signals are typically obtained by processing quadrature demodulated data with dedicated analog or digital circuits. In this paper, a software approach is proposed, that allows fully exploiting the reproduction and recording capabilities of low-cost personal computer sound cards and/or embedded chips. Forward/reverse signals are separated through a wideband Hilbert filter. No limitations are imposed on the input signal sample rate, which is matched to the standard output format of sound cards through a band-limited interpolation filter controlled in a feedback loop. The digital audio streaming is performed in real-time in a Windows®-based application. The processed data are in a standard format compatible with real-time recording in waveform or compressed files, as requested in many research applications. Simulations and in vivo tests show a typical cross talk of −50 dB between forward and reverse components, with low latency time (39 ms) and central processing unit load compatible to currently available personal computers. (E-mail: piero.tortoli@unifi.it)
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