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4.2.5.3 Doppler Calculation
A processing flow is shown in the following
Decimation
Wall Filter
Gain Control
Window Process
FFT
Power Calculation
Image Process
I
2
S
Doppler Sound
１． Decimates complex data
２． Removes low frequency signal components from Doppler data
by high pass filter.
３． Amplifies and attenuates Doppler data.
４． Converts Doppler sound data into I
data.
５． Multiplies Doppler data by window function.
６． Carries out frequency analysis of Doppler data based on the
Fast Fourier Transformation (FFT) algorithm.
７． Calculates brightness of each frequency component from
Doppler complex signal.
８． Applies image processing such as MAX sampling and
gamma correction to Doppler data.
4 - 13
2
S（Inter IC Sound）
L1E-EA0229
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