Doppler sound processing method and device

The invention discloses a Doppler sound processing method and device. The method comprises the steps of conducting Doppler imaging with a fixed pulse repetition frequency or a fixed sampling rate and acquiring orthogonal Doppler signals when a user sets a speed stage Vscale for Doppler imaging, wherein the fixed pulse repetition frequency or the fixed sampling rate is larger than a theoretical pulse repetition frequency or a theoretical sampling rate calculated according to the speed stage Vscale; conducting sound processing on the acquired orthogonal Doppler signals and playing the processed signals. Due to the fact that the pulse repetition frequency or the sampling rate is larger than the pulse repetition frequency corresponding to a flow rate gear selected by the user, sound aliasing caused by an over-low PRF is avoided during Doppler sound processing; meanwhile, when the PRF is low, due to the fact that the sound playing sampling rate is PRFmax instead of the PRF, metal sound can not occur from played si