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Class Information
Number: 381/94.2
Name: Electrical audio signal processing systems and devices > Noise or distortion suppression > Spectral adjustment
Description: Subject matter in which the unwanted signal is either at least partially removed by processing a selected frequency or frequency band, such as by subtracting the contents of a particular frequency band from the input signal, or is overcome by preemphasis of a particular frequency or band to enhance the signal to noise ratio.

Sub-classes under this class:

Class Number Class Name Patents
381/94.3 In multiple frequency bands 341

Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8712075 Spatially pre-processed target-to-jammer ratio weighted filter and method thereof Apr. 29, 2014
8693703 Method of combining at least two audio signals and a microphone system comprising at least two microphones Apr. 8, 2014
8693717 Method for compensating for an interference sound in a hearing apparatus, hearing apparatus, and method for adjusting a hearing apparatus Apr. 8, 2014
8675130 Electronic adapter unit for selectively modifying audio or video data for use with an output device Mar. 18, 2014
8666092 Noise estimation Mar. 4, 2014
8654990 Multiple microphone based directional sound filter Feb. 18, 2014
8644522 Method and system for modeling external volume changes within an acoustic echo canceller Feb. 4, 2014
8638952 Signal processing apparatus and signal processing method Jan. 28, 2014
8634577 Audio decoder Jan. 21, 2014
8634578 Multiband dynamics compressor with spectral balance compensation Jan. 21, 2014
8620010 Loudspeaker device Dec. 31, 2013
8615092 Sound processing device, correcting device, correcting method and recording medium Dec. 24, 2013
8611556 Calibrating multiple microphones Dec. 17, 2013
8600072 Audio data processing apparatus and method to reduce wind noise Dec. 3, 2013
8600073 Wind noise suppression Dec. 3, 2013
8589634 Processor extensions for accelerating spectral band replication Nov. 19, 2013
8588430 Controlling an adaptation of a behavior of an audio device to a current acoustic environmental condition Nov. 19, 2013
8577675 Method and device for speech enhancement in the presence of background noise Nov. 5, 2013
8571231 Suppressing noise in an audio signal Oct. 29, 2013
8571855 Audio enhancement system Oct. 29, 2013
8565459 Signal processing using spatial filter Oct. 22, 2013
8559652 Apparatus and method for removing white noise in portable terminal Oct. 15, 2013
8538035 Multi-microphone robust noise suppression Sep. 17, 2013
8520871 Method of and device for generating and processing parameters representing HRTFs Aug. 27, 2013
8515085 Signal processing apparatus Aug. 20, 2013
8515097 Single microphone wind noise suppression Aug. 20, 2013
8509450 Dynamic audibility enhancement Aug. 13, 2013
8498429 Acoustic correction apparatus, audio output apparatus, and acoustic correction method Jul. 30, 2013
8494180 Systems and methods to reduce idle channel current and noise floor in a PWM amplifier Jul. 23, 2013
8488807 Audio signal compensation device and audio signal compensation method Jul. 16, 2013
8488824 Audio encoding and decoding method and associated audio encoder, audio decoder and computer programs Jul. 16, 2013
8483406 System for detecting and reducing noise via a microphone array Jul. 9, 2013
8468018 Apparatus and method for canceling noise of voice signal in electronic apparatus Jun. 18, 2013
8467545 Noise reduction systems and methods for voice applications Jun. 18, 2013
8462970 Audio encoding and decoding method and associated audio encoder, audio decoder and computer programs Jun. 11, 2013
8457320 Wind noise classifier Jun. 4, 2013
8447044 Adaptive LPC noise reduction system May. 21, 2013
8422697 Background noise estimation Apr. 16, 2013
8416958 Signal processing apparatus Apr. 9, 2013
8416964 Vehicular automatic gain control (AGC) microphone system and method for post processing optimization of a microphone signal Apr. 9, 2013
8401206 Adaptive beamformer using a log domain optimization criterion Mar. 19, 2013
8379870 Ambient audio transformation modes Feb. 19, 2013
8379878 Pre-coding method for providing diversity gain in orthogonal frequency division multiplexing system and transmission apparatus and method using the pre-coding method Feb. 19, 2013
8379879 Active noise reduction system Feb. 19, 2013
8374358 Method for determining a noise reference signal for noise compensation and/or noise reduction Feb. 12, 2013
8364483 Method for separating source signals and apparatus thereof Jan. 29, 2013
8364479 System for speech signal enhancement in a noisy environment through corrective adjustment of spectral noise power density estimations Jan. 29, 2013
8364477 Method and apparatus for increasing speech intelligibility in noisy environments Jan. 29, 2013
8363850 Audio signal processing method and apparatus for the same Jan. 29, 2013
8363849 Automated interferometric noise measurement Jan. 29, 2013

1 2 3 4 5 6

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