Patent ID: 7611464

Claim:
A method for processing Doppler signal gaps, the method comprising the steps of: receiving Doppler signals during Doppler signal acquisition to obtain data of in-phase (I) component and quadrate (Q) component signals of the Doppler signals; receiving interruption of the Doppler signals indicating that the output of the data of said I and Q component signals is interrupted in a gap period, wherein the output of the data of said I and Q component signals is continuous both before and after the gap period; filtering the received Doppler signals using a high pass filter; estimating the data of the Doppler signals interrupted in said gap period based on the filtered Doppler signals received during Doppler signal acquisition; filling the interrupted Doppler signals with the data of the estimated Doppler signals so that the data of the I and Q component signals in said gap period are filled to form a continuous output; wall filtering the continuous output of the data of the filled I and Q component signals; and generating Doppler spectrum data or Doppler sound based on the wall filtered data of the filled I and Q component signals.