Patent ID: 8994381
Filing Date: 2015-03-31
Classification: G01R,G10L,H04R

Abstract:
1. Method of measuring an induced phase or frequency modulation effect of an audio amplifier, wherein the audio amplifier has an input and an output, comprising: providing a first signal comprising a pulsed waveform and a second signal whose frequency is higher than the frequency of the first signal to an input of the audio amplifier; wherein the output of the audio amplifier is coupled to a Wow and Flutter meter, a phase detector, and or a frequency modulation detector, wherein the Wow and Flutter meter phase detector and frequency modulation detector includes a band pass filter and a limiter circuit; measuring the induced phase or frequency modulation effect of one or more signals related to the pulsed waveform at the output of the audio amplifier; and wherein the phase or frequency modulation effect on one of the input signals is caused or induced by the second signal coupled to the input of the audio amplifier.