Patent ID: 9729987
Date: 2017-08-08
CPC Classifications: H04R

Claim:
1. Method of measuring a time varying or dynamic harmonic, cross modulation, N-Beat, and or triple beat distortion from an audio device, wherein the audio device has an input terminal and an output terminal, and N>2, comprising: providing at least two signals comprising at least a first signal generator comprising an arbitrary waveform including a stairstep waveform, and a second signal generator comprising at least one signal whose frequency is higher than the frequency of the first signal to the input terminal of the audio device; coupling the output terminal of the audio device to an input terminal of a bandpass filter, and wherein the bandpass filter provides an output terminal; the band pass filter passes a frequency related to the harmonic distortion signal, cross modulation signal, N-Beat distortion signal where N>2, or triple beat distortion signal; and the output terminal of the band pass filter provides an output signal indicative of the amplitude of the harmonic distortion signal, cross modulation signal, N-Beat distortion signal where N>2, or triple beat distortion signal; and measuring the harmonic, cross modulation, N-Beat, or triple beat distortion via measuring or displaying a time dependent amplitude level via the output signal at the output terminal of the band pass filter to provide the measurement of time varying amplitude of the harmonic distortion signal, cross modulation distortion signal, N-Beat distortion signal, or triple beat distortion signal, measurement of the audio device, wherein the time varying amplitude of the harmonic distortion signal, cross modulation distortion signal, N-Beat distortion signal, or triple beat distortion is induced or caused by the stairstep waveform.