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Class Information
Number: 381/55
Name: Electrical audio signal processing systems and devices > Audio transducer protection circuitry
Description: Subject matter where there is an audio transducer and circuitry to protect the transducer from damage due to abnormal operating conditions.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8712065 Transducer displacement protection Apr. 29, 2014
8615089 Dynamic power management in a portable media delivery system Dec. 24, 2013
8588428 Dynamic power sharing in a multi-channel sound system Nov. 19, 2013
8582786 Automatic gain control of amplifier by dynamic suppressing and output control at multiple stages Nov. 12, 2013
8577047 Control of a loudspeaker output Nov. 5, 2013
8532312 Mobile device having acoustic shock prevention circuit and related operation method Sep. 10, 2013
8515091 Forwarding an audio signal in an immersive audio conference system Aug. 20, 2013
8515084 Passive sound pressure level limiter with balancing circuit Aug. 20, 2013
8494171 Energy saving PWM sound device Jul. 23, 2013
8437478 Systems and methods for improved over-current clipping May. 7, 2013
8416956 Protected digital audio driver Apr. 9, 2013
8411870 Electronic apparatus Apr. 2, 2013
8385564 Amplifier thermal management Feb. 26, 2013
8379869 Method and system for acoustic shock protection Feb. 19, 2013
8339202 Current sensing system and method Dec. 25, 2012
8340307 Passive sound pressure level limiter Dec. 25, 2012
8284953 Circuit and method of reducing pop-up noise in a digital amplifier Oct. 9, 2012
8259953 Thermal protection of electro dynamic transducers used in loudspeaker systems Sep. 4, 2012
8238580 Module having a remote turn-on function for use with a powered subwoofer/speaker or other audio/visual electrical equipment Aug. 7, 2012
8238581 Powered subwoofer/speaker remote turn-on function Aug. 7, 2012
8223994 Method of limiting the maximum permitted sound volume in an earphone, and an earphone for carrying out the method Jul. 17, 2012
8218282 Portable electronic device and method for using the same Jul. 10, 2012
8204236 Protection procedure for speaker systems Jun. 19, 2012
8204260 Speaker apparatus, speaker driving apparatus and control method thereof Jun. 19, 2012
8199918 Loudspeaker protection circuit Jun. 12, 2012
8184830 Audio amplifier with simplified electrical isolation May. 22, 2012
8175305 Hearing aid with a drop safeguard May. 8, 2012
8126154 Circuit arrangement for the bidirectional operation of sound transducers disposed at the ends of a measuring section Feb. 28, 2012
8103021 Audio reproducing apparatus Jan. 24, 2012
8103023 Apparatus and method for acoustic beamforming Jan. 24, 2012
8081028 Systems and methods for improved over-current clipping Dec. 20, 2011
8077879 Audio output apparatus and television broadcast receiver Dec. 13, 2011
8077872 Headset visual feedback system Dec. 13, 2011
8068622 Method and apparatus for controlling a selectable voltage audio power output stage Nov. 29, 2011
8054995 System, method and apparatus for adjusting an output of a transducer Nov. 8, 2011
8027489 Multi-voltage biasing system with over-voltage protection Sep. 27, 2011
8027490 Audio control method and audio processing system Sep. 27, 2011
8019088 Low-frequency range extension and protection system for loudspeakers Sep. 13, 2011
8005230 Method and system for digitally controlling a multi-channel audio amplifier Aug. 23, 2011
7856108 Method for preventing an output device from being damaged Dec. 21, 2010
7848527 Dynamic power management in a portable media delivery system Dec. 7, 2010
7822214 Audio power output system with shared output blocking capacitor Oct. 26, 2010
7706545 Systems and methods for protection of audio amplifier circuits Apr. 27, 2010
7672462 Method and system for acoustic shock protection Mar. 2, 2010
7672463 Apparatus to control temperature of audio amp Mar. 2, 2010
7664273 Approach for controlling audio signals in remote location Feb. 16, 2010
7636446 State machine enabling auto-recovery of short-circuited class D audio amplifiers Dec. 22, 2009
7630505 Loudspeaker system Dec. 8, 2009
7606378 Radio distortion processing Oct. 20, 2009
7532729 Method for testing an appliance comprising an audio port, and a respective appliance May. 12, 2009

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