Quasi-logarithmic multisine excitations for broad frequency band measurements

Logarithmically distributed excitation signals are widely used to measure the transfer function of dynamic systems in a wide frequency band, covering several decades. Periodic signals are very popular in advanced dynamic signal analyzers. Generating periodic signals requires an equidistant frequency grid which conflicts with the logarithmic distribution, especially at the low frequencies. In this paper we offer an elegant solution to get around this problem that also makes an improved choice for the amplitude spectrum.