Patent ID: 8571225
Filing Date: 2013-10-29
Classification: H04R

Abstract:
1. A method for testing a speaker, said method comprising: applying a high-frequency voltage signal to a first terminal of said speaker, said high-frequency voltage signal being generated by a first electronic circuit; applying a constant voltage signal to a second terminal of said speaker, said constant voltage signal being generated by a second electronic circuit; measuring a current that flows through said speaker into said second electronic circuit; and determining a connect/disconnect state of said speaker from a value of said current; wherein the terminals of said speaker are coupled to a Class D switching amplifier of a bridge topology; said first electronic circuit includes a first arm of said Class D switching amplifier, said high-frequency voltage signal being applied to an input of the first arm; said second electronic circuit includes a second arm of said Class D switching amplifier, said constant voltage signal being applied to an input of the second arm; and said measuring said current that flows through said speaker includes measuring the current that flows in said second arm of said Class D switching amplifier.