The invention provides, in one aspect, a computerized method for estimating a weight of an animal. For example, a first storage device is located at a first storage site, and a second storage device is located at a second storage site. This electronic image in the camera is evaluated by an evaluation device for determining the distance of the profiled patterns from each other. In this manner gaps on the substrate are filled with a solid dielectric material. This stage also comprises an additional circuit block, able to output the absolute value of an input current, inserted between a node of the differential cell of the input stage and a node of the supplementary branch in order to add the absolute value of a portion of the signal current to the differential cell bias current. Acoustic training signals are acquired from an acoustic training source at an unknown location in an environment with an array of microphones placed at unknown positions in the environment.