Method and apparatus for dealiasing Doppler signals

A dealiasing apparatus in a spectral Doppler system, comprising:

• at least four first filters, for filtering one of two quadrature components of obtained quadrature Doppler signals in parallel to output at least four signals;
• at least four second filters, for filtering the other quadrature component of the quadrature Doppler signals to output at least four signals;
• wherein the at least four filters for each quadrature component are equally divided into two groups, and outputs of each group of the filters are to be used for Doppler signals processing in one of forward and reverse directions, and coefficients of different filters in each group can be interleaved with each other to form coefficients of a desired filter;
• an interleaving and accumulating unit, for interleaving and accumulating the at least eight signals, according to direction and quadrature component of the output Doppler signals, to obtain forward and reverse dealiased Doppler signals F(t) and R(t).

A dealiasing apparatus in a spectral Doppler system, comprising:

• four first filters, for filtering one of two quadrature components of obtained quadrature Doppler signals in parallel, to output four signals;
• four second filters, for filtering the other quadrature component of the quadrature Doppler signals in parallel to output four signals;
• wherein the four filters for each quadrature component are equally divided into two groups, and outputs of each group of the filters are to be used for Doppler signals processing in one of forward and reverse directions, and coefficients of the two different filters in each group can be interleaved with each other to form coefficients of a desired filter;
• an interleaving and accumulating unit, for interleaving and accumulating the eight dealiased signals, according to direction and quadrature component of the output Doppler signals, so as to obtain forward and reverse dealiased Doppler signals F(t) and R(t).