Patent ID: 8750535
Filing Date: 2014-06-10
Classification: H04R

Abstract:
1. An aviation headset for use with a power injection circuit, the aviation headset comprising: a headset interface by which the headset may be coupled to a matching headset interface of the power injection circuit, the headset interface including at least a microphone-high (mic-high) connection, a microphone-low (mic-low) connection, and a ground connection; an acoustic driver to acoustically output audio to an ear of a user; an acoustic driver ground conductor coupling the acoustic driver to the ground connection of the headset interface; a microphone to detect speech sounds of the user; a microphone low signal conductor and a microphone high signal conductor coupling the microphone to the mic-low and mic-high connections, respectively, of the headset interface; and an injected voltage tap circuit coupled to the ground connection and to the mic-low connection to receive electric power from a first DC voltage differential provided by the power injection circuit between the ground connection and the mic-low connection; wherein a second DC voltage differential existing between the mic-high connection and the mic-low connection is available to the microphone via the microphone high signal conductor and the microphone low signal conductor as a microphone bias voltage.