“echo signals”可以造什么句，echo signals造句

A Kind of Zero-crossing method for detecting Underwater small sine echo signals

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.

The characteristics of the test signals were analyzed and weak defect echo signals were successfully extracted by cut-off frequency technique.

Feature extraction of ultrasonic echo signals(RF);