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Table 1 The mean and standard deviation of the RRMS errors of the maximum frequency waveforms extracted from the signals with different SNR levels based on the STFT, the MPWD methods, and the AD-PCNN methods (×10-3).

From: Noise and Speckle Reduction in Doppler Blood Flow Spectrograms Using an Adaptive Pulse-Coupled Neural Network

 

SNR (dB)

Method

0

5

10

STFT

489.0 ± 21.0

164.0 ± 6.1

7.3 ± 0.2

4.3 ± 0.1

MPWD

3.4 ± 0.1

2.9 ± 0.1

2.5 ± 0.1

1.7 ± 0.1

AD-PCNN

3.1 ± 0.2

2.1 ± 0.2

1.9 ± 0.2

1.4 ± 0.2