The invention provides a detection and location method for leaked sound signals. The method comprises the steps of 1, acquiring leaked sound signals, ambient
noise signals and other interference
noise signals in the vicinity of a leakage point; 2, extracting the features of leaked signals; 3, calculating the
approximate entropy on a selected autocorrelation function value to obtain the metric of the
signal complexity; 4, conducting the
system identification for leaked signals: acquiring the
approximate entropy of the autocorrelation function of leaked signals, adopting the
approximate entropy as the input of the neural network
algorithm, and identifying the occurrence of a real leakage accident; 5, identifying a blind
system and locating the leakage point. According to the technical scheme of the invention, a sensor is adopted to replace the manual operation. Therefore, leakage points can be automatically detected and accurately located. The
primary problem that the locating is difficult can be solved. Based on the blind
system identification principle, leakage points can be located. In this way, the method is not limited by the actual conditions of detection objects. The detection and the location in both
positive pressure and negative pressure are realized. Moreover, the method is not limited by detection environments, and the detection operation can be conducted at any time.