Present application provides a method for suppressing noise in a spectral
Doppler system, comprising the steps of: obtaining a power spectrum of
Doppler signals demodulated in the spectral Doppler system, by performing
spectral analysis on the Doppler signals; estimating an average noise
power of the spectral Doppler system; designing a noise suppression
filter by determining its filter coefficients based on the power spectrum
of the Doppler signals and the estimated average noise power; filtering
the Doppler signals by using the designed noise suppression filter so as
to reduce the noise.