The problems a solution of bandpass filters for the new hydroacoustics system

This work describes results in development of the functional model of a new hydroacoustic system for detecting and processing hydroacoustic signals of floating objects, and these results are in connection with Butterworths bandpass filters. This work surrounded the basics concepts out of theory of filters, reasons for use Butterworths filters, as well as an example for estimate one of them. The work gives also and basics characteristics of water space where exist hydroacoustics preassure as result of many activities on float object, which don´t canceled anyway.