Advanced Technology Center, GE Yokogawa Medical Systems, Ltd.
B/Doppler duplex, Expansion, Signal interpolation, Zero-cross
We developed a new technique for expanding Doppler audio signals and applied it to the interpolation of periodic blanked
segments in a duplex system with B-mode imaging and pulsed Doppler. This technique detects the zero-crossing points of the
Doppler audio signal wave form and assigns each segment between a pair of zero-crossing points a positive value and then a
negative value, thus expanding the Doppler audio signal so that it provides continuous output during the subsequent blanked
segment. Compared with conventional interpolation methods that use wieghted duplication of Doppler audio signals to fill in
blank segments, this technique provides better audio quality and requires less computation.