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Browse by Category: Main > Electrical & Energy
Class Information
Number: 381/74
Name: Electrical audio signal processing systems and devices > Headphone circuits
Description: Subject matter having means to perform a desired electrical or electronic function in conjunction with a device held against the ear having a diaphragm which vibrates according to current variations.


Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
7623669 Simplified amplifier providing sharing of music with enhanced spatial presence through multiple headphone jacks Nov. 24, 2009
7623667 Electronic device accessory with ultrasonic tone generator Nov. 24, 2009
7616769 Variable and shiftable acoustic output signal limiter Nov. 10, 2009
7616767 Method and device for determining acoustical transfer impedance Nov. 10, 2009
7564966 Recognition of audio device in portable terminal Jul. 21, 2009
7519185 Earphone detection circuit Apr. 14, 2009
7502478 Stereo audio headset interface and method that is compatible with mono headsets Mar. 10, 2009
7496387 Wireless headset for use in speech recognition environment Feb. 24, 2009
7493079 Mobile terminal, method for recording/reproducing broadcast in mobile terminal, and broadcast recording/reproduction program Feb. 17, 2009
7474754 Method for canceling unwanted loudspeaker signals Jan. 6, 2009
7466838 Electroacoustic devices with noise-reducing capability Dec. 16, 2008
7460676 Headphone driving circuit Dec. 2, 2008
7450726 Headset detector in a device generating audio signals Nov. 11, 2008
7430300 Sound production systems and methods for providing sound inside a headgear unit Sep. 30, 2008
7418103 System and method for controlling states of a device Aug. 26, 2008
7412070 Headphoning Aug. 12, 2008
7409064 Music reproduction apparatus, audio player, and headphone Aug. 5, 2008
7395090 Personal portable integrator for music player and mobile phone Jul. 1, 2008
7388960 Multimedia speaker headphone Jun. 17, 2008
7373182 Wireless mobile phone including a headset May. 13, 2008
7367422 System and method for providing passive noise reduction May. 6, 2008
7356362 Headset structure with built-in audio source Apr. 8, 2008
7352871 Apparatus for communication and reconnaissance coupled with protection of the auditory system Apr. 1, 2008
7349546 System and method for identifying a headset type in an electrical device Mar. 25, 2008
7346175 System and apparatus for speech communication and speech recognition Mar. 18, 2008
7337027 Audio signal reproducing apparatus Feb. 26, 2008
7333622 Dynamic binaural sound capture and reproduction Feb. 19, 2008
7330553 Audio signal reproducing apparatus Feb. 12, 2008
7327850 Supplying electrical power Feb. 5, 2008
7319762 Headset with flashing light emitting diodes Jan. 15, 2008
7317802 Active-noise-reduction headsets with front-cavity venting Jan. 8, 2008
7299142 System and method for prevention of accidental activation of portable audio device Nov. 20, 2007
7283635 Headset with memory Oct. 16, 2007
7272073 Method and device for generating information relating to the relative position of a set of at least three acoustic transducers Sep. 18, 2007
7269446 Hands-free signal processing device in a mobile communication terminal Sep. 11, 2007
7260231 Multi-channel audio panel Aug. 21, 2007
7254415 Portable wireless terminal, method of outputting sound, and method of picking up sound Aug. 7, 2007
7251335 Self contained MP3 player and earphones Jul. 31, 2007
7248705 Noise reducing headphones with sound conditioning Jul. 24, 2007
7248707 Detection circuit Jul. 24, 2007
7231037 Active audio compressing in telecommunication Jun. 12, 2007
7227958 Connector device for detecting insertion or removal of plug from common jack Jun. 5, 2007
7203327 Apparatus for and method of processing audio signal Apr. 10, 2007
7190797 Headset with foldable noise canceling and omnidirectional dual-mode boom Mar. 13, 2007
7181024 Portable audio listening apparatus Feb. 20, 2007
7177433 Method of improving the audibility of sound from a loudspeaker located close to an ear Feb. 13, 2007
7174196 Implement for mobile phone Feb. 6, 2007
7162047 Audio reproducing apparatus Jan. 9, 2007
7151910 Wireless microphone information displaying apparatus and method thereof Dec. 19, 2006
7149551 Wireless headset capable of automatic link connection and method for controlling the same Dec. 12, 2006

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