Acta Physica Sinica, Volume. 68, Issue 8, 084303-1(2019)
Fig. 2. Envelope of ultrasonic echo model: (a) [
Fig. 3. Simulation of ultrasonic echo: (a) Ideal ultrasonic signal; (b)noisy ultrasonic echo.仿真超声回波 (a)理想超声信号; (b)含噪超声回波
Fig. 4. Comparison of de-noising by different methods: (a) Noisy echo plotted in a black solid line, original signal plotted in a red dotted line; (b) signal de-noised by our proposed method; (c) signal de-noised by wavelet method; (d) signal de-noised by EMD method不同方法降噪结果对比 (a)黑色实线为含噪回波, 红色虚线为原始信号; (b)本文方法处理结果; (c)小波方法处理结果; (d) EMD方法处理结果
Fig. 6. Comparison of different ultrasonic signal models.不同超声信号模型对比
Fig. 7. Comparison of measured ultrasonic echo processing results: (a) Measured ultrasonic echo; (b) measured ultrasonic echo contaminated by system noise; (c) echo processed by our proposed method; (d) echo processed by wavelet method; (e) echo processed by EMD method.实测超声回波处理结果对比 (a)实测超声回波; (b)混入系统噪声后的实测超声回波, 信噪比为–10 dB; (c)本文方法结果; (d)小波方法结果; (e) EMD方法结果
Estimation error of transit time
渡越时间
Estimation error of transit time
渡越时间
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Comparison of denoising results using different methods.
不同方法降噪结果对比
Comparison of denoising results using different methods.
不同方法降噪结果对比
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Da-Wei Wang, Zhao-Ba Wang, You-Xing Chen, Hai-Yang Li, Hao-Kun Wang.
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Received: Nov. 23, 2018
Accepted: --
Published Online: Oct. 29, 2019
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