Patents Assigned to Neofidelity, Inc.
  • SYSTEM AND METHOD FOR INTERLEAVING DIGITAL AUDIO SIGNAL INCLUDING PWM SIGNAL AND DIGITAL AUDIO PROCESSING DEVICE EMPLOYING THE SAME
    Publication number: 20170359043
    Abstract: A system, a method for interleaving a digital audio signal including a PWM signal, and a digital audio processing device employing the same in accordance with the present invention are disclosed. The system, the method and the digital audio processing device is capable of minimizing the interference with an RF signal such as an AM signal or an FM signal by interleaving the digital audio signal including the PWM signal.
    Type: Application
    Filed: March 17, 2017
    Publication date: December 14, 2017
    Applicant: NEOFIDELITY, INC.
    Inventor: Yeongha CHOI
  • Amplifier capable of controlling cut-off frequency in real time and amplification method for controlling cut-off frequency in real time
    Patent number: 9414163
    Abstract: An amplifier and an amplification method are provided. In accordance with the present invention, a cut-off frequency of variable high-pass filter is dynamically adjusted in real time according to a low frequency level of an input audio signal to prevent a distortion of the audio signal and damage of loudspeaker.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: August 9, 2016
    Assignee: NEOFIDELITY, INC.
    Inventor: Yeongha Choi
  • Method for dynamically adjusting gain of parametric equalizer according to input signal, dynamic parametric equalizer and dynamic parametric equalizer system employing the same
    Patent number: 9288579
    Abstract: The present invention relates to a method for dynamically adjusting a gain of parametric equalizer according to an input signal, a dynamic parametric equalizer employing the same and a dynamic parametric equalizer system employing the same wherein a gain of parametric equalizer is dynamically adjusted according to a level of an input digital audio signal to prevent distortion of output signal.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: March 15, 2016
    Assignee: NEOFIDELITY, Inc.
    Inventors: Yeongha Choi, Duckhwan Kim
  • AMPLIFIER CAPABLE OF CONTROLLING CUT-OFF FREQUENCY IN REAL TIME AND AMPLIFICATION METHOD FOR CONTROLLING CUT-OFF FREQUENCY IN REAL TIME
    Publication number: 20150264481
    Abstract: An amplifier and an amplification method are provided. In accordance with the present invention, a cut-off frequency of variable high-pass filter is dynamically adjusted in real time according to a low frequency level of an input audio signal to prevent a distortion of the audio signal and damage of loudspeaker.
    Type: Application
    Filed: June 25, 2014
    Publication date: September 17, 2015
    Applicant: Neofidelity, Inc.
    Inventor: Yeongha CHOI
  • Speaker with built-in filter for digital amplifier
    Patent number: 8965009
    Abstract: A speaker with a built-in filter used for a digital amplifier is provided. The speaker with the built-in filter includes an inductor wound on an outer circumferential surface of a pillar passing through a magnet. The speaker in accordance with the present invention may be directly connected to the digital amplifier without an additional low pass filter interposed therebetween, enabling a smaller and lighter digital amplifier.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: February 24, 2015
    Assignee: Neofidelity, Inc.
    Inventors: Soo Myung Kim, Min Soo Kim, Hyung Sup Yoon
  • QUANTIZER WITH SIGMA-DELTA MODULATOR, ANALOG-TO-DIGITAL CONVERTER INCLUDING THE SAME AND QUANTIZATION METHOD USING THE SAME
    Publication number: 20140347200
    Abstract: The present invention provides a quantizer with a sigma-delta modulator, an analog-to-digital converter including the same and a quantization method using the same capable of obtaining a high signal-to-noise ratio with a relatively small number of comparators. The quantizer, the analog-to-digital converter and the quantization method of the present invention reduces quantization errors and increases noise shaping order.
    Type: Application
    Filed: May 23, 2014
    Publication date: November 27, 2014
    Applicants: NEOFIDELITY, INC., SNU R&DB FOUNDATION
    Inventors: Junsoo CHO, Hyunjoong LEE, Suhwan KIM
  • METHOD FOR DYNAMICALLY ADJUSTING GAIN OF PARAMETRIC EQUALIZER ACCORDING TO INPUT SIGNAL, DYNAMIC PARAMETRIC EQUALIZER AND DYNAMIC PARAMETRIC EQUALIZER SYSTEM EMPLOYING THE SAME
    Publication number: 20140211968
    Abstract: The present invention relates to a method for dynamically adjusting a gain of parametric equalizer according to an input signal, a dynamic parametric equalizer employing the same and a dynamic parametric equalizer system employing the same wherein a gain of parametric equalizer is dynamically adjusted according to a level of an input digital audio signal to prevent distortion of output signal.
    Type: Application
    Filed: January 28, 2014
    Publication date: July 31, 2014
    Applicant: NEOFIDELITY, INC.
    Inventors: Yeongha CHOI, Duckhwan KIM
  • Multiband DRC system and method for controlling the same
    Patent number: 8600076
    Abstract: A multiband DRC system and a method for controlling the same are disclosed. In accordance with the present invention, the system and the method are capable of increasing an overall loudness of an output signal by controlling thresholds and gains of plurality of DRCs included in the multiband DRC system according to frequency bands.
    Type: Grant
    Filed: November 3, 2010
    Date of Patent: December 3, 2013
    Assignee: Neofidelity, Inc.
    Inventors: Yeongha Choi, Min Soo Kim
  • SPEAKER WITH BUILT-IN FILTER FOR DIGITAL AMPLIFIER
    Publication number: 20130223670
    Abstract: A speaker with a built-in filter used for a digital amplifier is provided. The speaker with the built-in filter includes an inductor wound on an outer circumferential surface of a pillar passing through a magnet. The speaker in accordance with the present invention may be directly connected to the digital amplifier without an additional low pass filter interposed therebetween, enabling a smaller and lighter digital amplifier.
    Type: Application
    Filed: December 20, 2012
    Publication date: August 29, 2013
    Applicant: NEOFIDELITY, INC.
    Inventor: NEOFIDELITY, INC.
  • Power supply circuit including voltage regulator and headphone driving circuit employing the same
    Patent number: 8452025
    Abstract: A power supply circuit including a voltage regulator and a headphone driving circuit employing the same are disclosed. In accordance with the present invention, the power supply circuit may provide stable power supply to the amplifier since the power supply circuit generates the constant voltage +Vreg and the constant voltage ?Vreg from +VDD robust to stronger than a power noise, and the balanced signal path for isolating the noise of the input signal to be amplified is not required, thereby simplifying the constitution of the circuit.
    Type: Grant
    Filed: March 7, 2011
    Date of Patent: May 28, 2013
    Assignee: Neofidelity, Inc.
    Inventors: Yeongha Choi, Jin Ho Oh, Min Soo Kim, Jae-Hee Won
  • Necklace type detachable three dimensional sound reproduction apparatus
    Patent number: 8315416
    Abstract: A necklace type sound reproduction apparatus is disclosed. The apparatus is detachable from a media player to be worn on a neck of a user. An acoustic sound reproduced by a digital amplifier and a speaker of the apparatus is delivered to an ear of the user without using an earphone or a headphone via an audio signal processing.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: November 20, 2012
    Assignee: Neofidelity, Inc.
    Inventor: Duck Soo Lee
  • Switching device of digital amplifier and method for driving the same
    Patent number: 8283976
    Abstract: A switching device of a digital amplifier and a method for controlling the same are disclosed. In accordance with the present invention, a linearity is maintain even for a short pulse width since a data signal having a pulse width shorter than a predetermined length. Moreover, when an MLP signal is located at both sides of a compensating signal without overlapping with each other, a problem due to a common mode may be prevented.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: October 9, 2012
    Assignee: Neofidelity, Inc.
    Inventors: Yeongha Choi, Minsoo Kim, Sungil Kim, Seokil Jeong
  • Media playback apparatus having speakers with rotatable connecting means
    Patent number: 8275159
    Abstract: A media playback media playback apparatus having user-selectable shapes is disclosed. In accordance with the media playback apparatus having user-selectable shapes in accordance with the present invention, speakers are attached to a media playback unit via rotatable connecting means such that a user may select a shape of the media playback apparatus according to his or her preference.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: September 25, 2012
    Assignee: Neofidelity, Inc.
    Inventor: Duck Soo Lee
  • POWER SUPPLY CIRCUIT INCLUDING VOLTAGE REGULATOR AND HEADPHONE DRIVING CIRCUIT EMPLOYING THE SAME
    Publication number: 20110222702
    Abstract: A power supply circuit including a voltage regulator and a headphone driving circuit employing the same are disclosed.
    Type: Application
    Filed: March 7, 2011
    Publication date: September 15, 2011
    Applicant: NEOFIDELITY, INC.
    Inventors: Yeongha CHOI, Jin Ho OH, Min Soo KIM, Jae-Hee WON
  • SWITCHING DEVICE OF DIGITAL AMPLIFIER AND METHOD FOR DRIVING THE SAME
    Publication number: 20110181356
    Abstract: A switching device of a digital amplifier and a method for controlling the same are disclosed. In accordance with the present invention, a linearity is maintain even for a short pulse width since a data signal having a pulse width shorter than a predetermined length. Moreover, when an MLP signal is located at both sides of a compensating signal without overlapping with each other, a problem due to a common mode may be prevented.
    Type: Application
    Filed: January 26, 2011
    Publication date: July 28, 2011
    Applicant: NEOFIDELITY, INC.
    Inventors: Yeongha CHOI, Minsoo KIM, Sungil KIM, Seokil JEONG
  • MULTIBAND DRC SYSTEM AND METHOD FOR CONTROLLING THE SAME
    Publication number: 20110110533
    Abstract: A multiband DRC system and a method for controlling the same are disclosed. In accordance with the present invention, the system and the method are capable of increasing an overall loudness of an output signal by controlling thresholds and gains of plurality of DRCs included in the multiband DRC system according to frequency bands.
    Type: Application
    Filed: November 3, 2010
    Publication date: May 12, 2011
    Applicant: NEOFIDELITY, INC.
    Inventors: Yeongha CHOI, Min Soo KIM
  • Detachable Audio Module And Media Player Including The Same
    Publication number: 20080015716
    Abstract: A detachable audio module and a media player including the same are disclosed. In accordance with the detachable audio module and the media player including the same, an audio signal and a control signal is received via a wired communication when the detachable audio module is attached to the reproduction transmitter module and via a wireless communication when the detachable audio module is detached from the reproduction transmitter module to provide an automatic wireless linking function.
    Type: Application
    Filed: June 28, 2007
    Publication date: January 17, 2008
    Applicant: Neofidelity , Inc.
    Inventor: Duck Soo LEE
  • Necklace Type Detachable Three Dimensional Sound Reproduction Apparatus
    Publication number: 20080013778
    Abstract: A necklace type sound reproduction apparatus is disclosed. The apparatus is detachable from a media player to be worn on a neck of a user. An acoustic sound reproduced by a digital amplifier and a speaker of the apparatus is delivered to an ear of the user without using an earphone or a headphone via an audio signal processing.
    Type: Application
    Filed: June 28, 2007
    Publication date: January 17, 2008
    Applicant: Neofidelity, Inc.
    Inventor: Duck Soo LEE