Patent ID: 9479869
Filing Date: 2016-10-25
CPC Classification: G10K,H03F,H04R

Claim Text:
1. A method comprising: generating, by an audio circuit configured to generate analog audio signals for playback to a listener of a transducer device coupled to an electrical terminal for coupling the transducer device to the audio circuit, a test analog audio signal substantially inaudible to the listener of the transducer device wherein the audio circuit further comprises a power amplifier having an audio input for receiving an audio input signal, an audio output for providing the analog audio signal, and a variable compensation capacitor; coupling a test impedance to the electrical terminal, such that when the transducer device is coupled to the electrical terminal, the load impedance is coupled to the test impedance; measuring a voltage or a current associated with the test impedance in response to the test analog audio signal; and determining a value of the load impedance based on the voltage or the current; and setting a capacitance of the variable compensation capacitor based on the load impedance.