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Output clipping detection in audio power amplifiers has become widespread. This paper illustrates the mathematics useful to calculate the clipping total harmonic distortion of a sinusoidal signal as well as the relationship between the latter and the output of a clipping detection device. Furthermore, a few circuital solutions are described in connection with a system dimensioning problem.

This paper presents an analytical approach to the problem of accurately determining dissipation and efficiency in class B and AB audio power amplifiers, in the case of both sinusoidal and random signals, where the latter represents a suitable approximation to real music-program signals. The results obtained, summarized in a series of graphs, show that the sinewave approach leads to an overestimation of dissipated power.