用“echo signals”造句大全，echo signals造句
Feature extraction of ultrasonic echo signals(RF);
It is often misjudged the flaw echo in ultrasonic examination that the echo signals produced by sound field property and geometrical shape of the component examined according to sound field theory.
A Kind of Zero-crossing method for detecting Underwater small sine echo signals
The characteristics of the test signals were analyzed and weak defect echo signals were successfully extracted by cut-off frequency technique.
