| 摘要 |
A distance measuring system comprises first and second transducers, and an ultrasound ranging subsystem coupled to the first and second transducers for performing a plurality of distance measurements between the first and second transducers. The distance measuring system further comprises a filter couple d to the ultrasound ranging subsystem for filtering ultrasound interference fr om the plurality of distance measurements (such as, e.g., eight), and outputtin g a distance based on the filtered distance measurements. The filter filters t he ultrasound interference by selecting one of the plurality distance measurements, in which case, the outputted distance is the selected distance measurement. Because the ultra sound interference will typically represent itself as the shortest distance measurement, the selected distance measureme nt is preferably greater than the minimum distance measurement (such as, e.g., the maximum distance measurement), thereby filtering the ultrasound interference out.
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