Abstract: In the paper, the testing method of DTMF circuits applied for dialing signal generation in telecommunication systems is described. The method enables determining: frequency, amplitude, and harmonic distortions of DTMF signals generated by tested integrated circuit. It was developed by the authors. Application of digital IIR filters and Fourier transform provides good accuracy and constant metrological parameters of the test system in connection with short test time. As a result of the developed method, the automatic telephone test system TAT-92 controlled by a personal computer is designed. This paper describes the problem, the solution, and the comparison of new method and classical method, based on analog filters. !4
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