Abstract: There is disclosed a noise reducing headphone including a headphone housing, a microphone generate an ambient audio signal representative of ambient noise, a processor to generate an anti-sound signal based on the ambient audio signal. A first speaker is disposed within the headphone housing to convert the anti-sound signal into anti-sound. A second speaker is disposed within the headphone housing to convert an audio input signal into high fidelity sound. At least one characteristic of the second speaker is different from a corresponding characteristic of the first speaker.
Type:
Grant
Filed:
April 8, 2016
Date of Patent:
June 13, 2017
Assignee:
Baltic Latvian Universal Electronics, LLC
Inventors:
Daniel C. Wiggins, Thomas Ezekiel Burgess, Matthew Fumio Yamamoto
Abstract: There is disclosed a microphone, a circuit, and a method. A microphone capsule may include an electret microphone and a field effect transistor (FET). A floating DC voltage source may have a first end connected to a drain terminal of the electret microphone capsule and a second end. A load resistor may be connected between the second end of the floating DC voltage source and a source terminal of the electret microphone capsule. A voltage follower may have an output connected to the source terminal of the electret microphone capsule and the first end of the floating DC voltage source. A coupling capacitor may couple an audio signal from the source terminal of the electret microphone capsule to an input of the voltage follower.
Type:
Grant
Filed:
March 17, 2010
Date of Patent:
November 19, 2013
Assignee:
Baltic Latvian Universal Electronics, LLC