Aspects of present disclosure relate to a test signal generator, a method for estimating the battery life of battery-powered audio products by means of a test signal simulating effects of music, and a computer program product for generating a test signal simulating the effects of music. The method may include at least one of: extracting, by a test signal generation controller, one or more general characteristics of music, transmitting, by the test signal generation controller, the one or more general characteristics of music generated to a graphical user interface of a test signal generator, processing, by one or more music characteristics simulators, a white noise signal generated by a white noise generator of the test signal generator according to the one or more general characteristics of music to generate the test signal, and providing the formed test signal through a test signal output device of the test signal generator.