Any mechanical system possesses its own vibrating characteristics from which functioning can be understood and foreseen. Modal parameters such as natural frequencies and damping ratios are the main examples. This paper presents homemade numerical analyzer for characterizing them. The procedure is based on complex Morlet wavelet transform with particular use of translated version for better detection of closed modes. The code has been successfully tested through simulated signals. Experimental validation was carried out through the modal analysis of a gear motor on which repeatable and reliable results were obtained.