Patent ID: 8325931

Claim:
An apparatus comprising: a detecting circuit to measure at least one response characteristic of an output channel in an electro-acoustic transducer system connected to an output terminal of the apparatus; a memory storing a plurality of equalizations, each said equalization corresponding to a known electro-acoustic transducer system, and storing a plurality of response characteristics, each said response characteristic associated with one said equalization; and a processor in communication with the detecting circuit and the memory and including executable instructions to select one of said stored response characteristics matching the response characteristic measured by the detecting circuit; wherein the response characteristic is an electrical impedance response characteristic; and wherein the detecting circuit comprises: an impedance to digital converter; and a first switch coupled to the impedance to digital converter and to the output terminal and under the control of the processor to selectively couple the impedance to digital converter to the output terminal in place of an amplification circuit.