Method and device for processing signals and Doppler ultrasound system
An ultrasound system and signal technology, applied in the signal processing field of Doppler ultrasound system, can solve problems such as negative spectrum noise
Active Publication Date: 2011-03-30
SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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However, simple summation and averaging cannot filter out the noise interference of this segment, such as Figure 12 As shown, when decimating, negative-going noise that is not fully suppressed can alias into the low-frequency signal
Therefore, this method still cannot solve the problem of spectrum black line very well, from Figures 13 to 14 It can be seen that the black line caused by the sudden attenuation of the spectrum is still relatively prominent, and it also causes negative spectrum noise, so it is necessary to further improve the existing technology to solve the problems existing in the existing technology
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[0037] The specific implementation of the method and system of the present invention will be described in detail below in conjunction with the accompanying drawings. Aiming at the shortcomings of prior art methods, the present invention provides a signal processing method, such as Figure 17 shown, which includes:
[0038] Step 100, increase the original data sampling rate of the A / D sampling device by an integer multiple, make it work in an oversampling state, and obtain an oversampling signal, such as completing the sampling of the input analog signal with an integer multiple of the highest sampling rate required by the system ;
[0039] Step 200, performing frequency shift calculation on the oversampled signal according to the automatically adjusted frequency shift amount of the ultrasound system baseline, to obtain a frequency shifted signal;
[0040] Step 300, performing filtering processing;
[0041] Step 400, extract part of the signal from the filtering result, rest...
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The invention discloses a method and a device for processing signals and a Doppler ultrasound system. The method comprises the following steps of: improving integral multiple of original data sampling rate of an A / D (Analog / Digital) sampler to make the A / D sampler obtain over-sampling signals at the state of over-sampling; carrying out the frequency shift operation on the over-sampling signals according to automatic adjusting frequency shift amount of an ultrasound system base line to obtain signals after frequency shift; carrying out filtering processing; extracting a part of signals from the filtered results, and restoring frequency spectrum elements corresponding to the original data sampling rate to obtain the down-sampling results; and carrying out reverse frequency shift adjustment on the down-sampling results. The invention can eliminate frequency spectrum black line caused by the A / D device and remove the noise interference caused by over-sampling.
Description
technical field [0001] The invention relates to the technical field of ultrasonic system signal processing, in particular to a signal processing method and device applied to a Doppler ultrasonic system. Background technique [0002] Usually, in an ultrasonic diagnostic instrument that uses continuous wave Doppler technology to measure blood flow velocity, when applying continuous wave Doppler technology to examine high-speed blood flow in organs such as the heart, the A / D sampling device obtains the required sampling rate data, because A / D The frequency spectrum characteristics of the device itself, when the baseline is adjusted, there will be obvious horizontal black lines on the frequency spectrum. [0003] Such as figure 1 As shown, the basic signal processing flow of the traditional continuous wave ultrasonic Doppler spectrum analysis system is given. Calculate the transmit phase of different channels and the receive phase of different channels according to the focus ...
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Inventor 皮兴俊
Owner SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD