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Class Information
Number: 381/98
Name: Electrical audio signal processing systems and devices > Including frequency control
Description: Subject matter with means to vary or maintain the frequency response of the system.










Sub-classes under this class:

Class Number Class Name Patents
381/101 Automatic tone control 149
381/103 Having automatic equalizer circuit 420
381/99 Having crossover filter 199


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14

Patent Number Title Of Patent Date Issued
8712074 Noise spectrum tracking in noisy acoustical signals Apr. 29, 2014
8712067 System and method of improving audio signals for the hearing impaired Apr. 29, 2014
8705750 Device and method for converting spatial audio signal Apr. 22, 2014
8705765 Ringtone enhancement systems and methods Apr. 22, 2014
8706497 Speech signal restoration device and speech signal restoration method Apr. 22, 2014
8693705 Response waveform synthesis method and apparatus Apr. 8, 2014
8693706 Pseudo bass generating apparatus Apr. 8, 2014
8687822 Filtering system for equalizing a loudspeaker system Apr. 1, 2014
8688045 FM transmitter and non-FM receiver integrated on single chip Apr. 1, 2014
8682002 Systems and methods for transducer calibration and tuning Mar. 25, 2014
8675892 Spectral management system Mar. 18, 2014
8666093 Processing an audio input signal to produce a processed audio output signal Mar. 4, 2014
8649531 Method and system for approximating graphic equalizers using dynamic filter order reduction Feb. 11, 2014
8638953 Systems and methods for generating phantom bass Jan. 28, 2014
8634564 Signal processing device and method, and a program Jan. 21, 2014
8634578 Multiband dynamics compressor with spectral balance compensation Jan. 21, 2014
8625813 Asymmetric polynomial psychoacoustic bass enhancement Jan. 7, 2014
8626322 Multimedia display based on audio and visual complexity Jan. 7, 2014
8618403 Tone control apparatus Dec. 31, 2013
8615093 Apparatus and method for processing audio signal Dec. 24, 2013
8611557 Method and apparatus for audio processing Dec. 17, 2013
8600074 Loudness modification of multichannel audio signals Dec. 3, 2013
8594343 Sound processing apparatus and sound processing method Nov. 26, 2013
8594345 Automatic correction of loudness level in audio signals Nov. 26, 2013
8588430 Controlling an adaptation of a behavior of an audio device to a current acoustic environmental condition Nov. 19, 2013
8588432 Apparatus and method for authorizing reproduction and controlling of program transmissions at locations distant from the program source Nov. 19, 2013
8582784 Method and device for extension of low frequency output from a loudspeaker Nov. 12, 2013
8582785 Method and apparatus to enhance low frequency components and medium frequency components of audio signal Nov. 12, 2013
8577686 Method and apparatus for decoding an audio signal Nov. 5, 2013
8577065 Systems and methods for creating immersion surround sound and virtual speakers effects Nov. 5, 2013
8577053 Ticketing and/or authorizing the receiving, reproducing and controlling of program transmissions by a wireless device that time aligns program data with natural sound at locations distant from Nov. 5, 2013
8577045 Apparatus and method for encoding a multi-channel audio signal Nov. 5, 2013
8571226 Automatic polarity adaptation for ambient noise cancellation Oct. 29, 2013
8571236 Volume control system, controller, and amplifying apparatus Oct. 29, 2013
8565449 System and method for digital signal processing Oct. 22, 2013
8565448 Dynamic bass equalization with modified Sallen-Key high pass filter Oct. 22, 2013
8565447 Active instrument subwoofer system for low frequency enhancement Oct. 22, 2013
8559655 Efficiency optimized audio system Oct. 15, 2013
8554145 Server for allocating a frequency for wireless audio communications Oct. 8, 2013
8554349 High-frequency interpolation device and high-frequency interpolation method Oct. 8, 2013
8542840 Apparatus and method for filtering a signal to match a loudspeaker Sep. 24, 2013
8515093 Input signal mismatch compensation system Aug. 20, 2013
8515085 Signal processing apparatus Aug. 20, 2013
8509455 Multiple-use acoustic port Aug. 13, 2013
8503696 Equalizer interface for electronic apparatus Aug. 6, 2013
8498430 Automatic correction of loudness level in audio signals Jul. 30, 2013
8498429 Acoustic correction apparatus, audio output apparatus, and acoustic correction method Jul. 30, 2013
8494171 Energy saving PWM sound device Jul. 23, 2013
8483411 Method and an apparatus for processing a signal Jul. 9, 2013
8484021 Apparatus for encoding/decoding multichannel signal and method thereof Jul. 9, 2013

1 2 3 4 5 6 7 8 9 10 11 12 13 14










 
 
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