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Class Information
Number: 381/19
Name: Electrical audio signal processing systems and devices > Binaural and stereophonic > Quadrasonic
Description: Subject matter in which four independent sound signals are to be reproduced.










Sub-classes under this class:

Class Number Class Name Patents
381/20 Matrix 141


Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8705749 Audio signal transformatting Apr. 22, 2014
8705779 Surround sound virtualization apparatus and method Apr. 22, 2014
8693697 Matrix encoder with improved channel separation Apr. 8, 2014
8675899 Front surround system and method for processing signal using speaker array Mar. 18, 2014
8670576 Method and an apparatus for processing an audio signal Mar. 11, 2014
8654994 Method and an apparatus for processing an audio signal Feb. 18, 2014
8638947 Angle-dependent operating device or method for generating a pseudo-stereophonic audio signal Jan. 28, 2014
8638945 Apparatus and method for encoding/decoding signal Jan. 28, 2014
8625811 Method and apparatus for encoding and decoding stereo signal and multi-channel signal Jan. 7, 2014
8619996 Apparatus and method for transmitting digital multimedia broadcasting data, and method and apparatus for receiving digital multimedia broadcasting data Dec. 31, 2013
8619998 Spatial audio enhancement processing method and apparatus Dec. 31, 2013
8611545 Surround generation apparatus Dec. 17, 2013
8600532 Method and an apparatus for processing a signal Dec. 3, 2013
8595017 Audio encoding method and device Nov. 26, 2013
8588947 Apparatus for processing an audio signal and method thereof Nov. 19, 2013
8521313 Method and apparatus for processing a media signal Aug. 27, 2013
8483411 Method and an apparatus for processing a signal Jul. 9, 2013
8472631 Multi-channel audio enhancement system for use in recording playback and methods for providing same Jun. 25, 2013
8467549 Audio information processing apparatus and audio information processing method Jun. 18, 2013
RE44261 Volume control for audio signals Jun. 4, 2013
8428267 Method and an apparatus for decoding an audio signal Apr. 23, 2013
8428269 Head related transfer function (HRTF) enhancement for improved vertical-polar localization in spatial audio systems Apr. 23, 2013
8411869 Method and apparatus for processing a media signal Apr. 2, 2013
8405410 Detection apparatus and method for superconducting coil quench Mar. 26, 2013
8340305 Audio encoding method and device Dec. 25, 2012
8340302 Parametric representation of spatial audio Dec. 25, 2012
8331570 Method and system for enhancing bass effect in audio signals Dec. 11, 2012
8320592 Apparatus and method of reproducing virtual sound of two channels based on listener's position Nov. 27, 2012
8295494 Enhancing audio with remixing capability Oct. 23, 2012
8290169 Time shifted harmonics generator Oct. 16, 2012
8284956 Method and system for enhancing bass effect in audio signals Oct. 9, 2012
8280538 System, medium, and method of encoding/decoding multi-channel audio signals Oct. 2, 2012
8275160 Delay time calculation apparatus, delay time calculation method, and storage medium storing program therefor Sep. 25, 2012
8270618 Compatible multi-channel coding/decoding Sep. 18, 2012
8270642 Method and system for producing a binaural impression using loudspeakers Sep. 18, 2012
8271290 Encoding and decoding of audio objects Sep. 18, 2012
8259964 Sound device Sep. 4, 2012
8254604 Array speaker system and method of implementing the same Aug. 28, 2012
8254584 Method, medium, and system encoding/decoding multi-channel signal Aug. 28, 2012
8243970 Virtual reality sound for advanced multi-media applications Aug. 14, 2012
8218774 Apparatus and method for processing continuous wave fields propagated in a room Jul. 10, 2012
8218798 Sound processor Jul. 10, 2012
8208639 Audio output device and audio output method Jun. 26, 2012
8208641 Method and apparatus for processing a media signal Jun. 26, 2012
8194863 Speaker system Jun. 5, 2012
8194884 Aligning time variable multichannel audio Jun. 5, 2012
8189796 Voice response system May. 29, 2012
8175287 Sound device May. 8, 2012
8170222 Augmented reality enhanced audio May. 1, 2012
8130974 Vehicular active sound control system Mar. 6, 2012

1 2 3 4 5










 
 
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