Method for predicting zero crossing point of ultrasonic signal based on multi-threshold comparison
A prediction method, ultrasonic technology, applied in measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve problems such as poor anti-interference ability, achieve cost saving, improve accuracy and reliability, and reduce requirements
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[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0026] The present invention adopts the method of combining measurement and calculation, obtains sample points through multi-threshold comparison, and performs ultrasonic wave curve fitting, and then calculates the zero-crossing point of the ultrasonic signal by using the mathematical expression obtained from the curve fitting.
[0027] This method is mainly divided into the following two steps:
[0028] Step 1) Using multi-threshold comparison to obtain the abscissa and ordinate parameters of the sample points required for curve fitting. Such as figure 1 As shown, in order to reduce the performance requirements of the multi-voltage comparator 7, avoid negative power supply, and save costs, before the original ultrasonic receiving signal 1 enters the multi-voltage comparator 7, voltage bias processing must be performed first, and the original ultrasoni...
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