Search Patents
  • EQ correction for source device impedance and output device impedance interactions
    Patent number: 9264811
    Abstract: A software-based equalization method corrects for effects of impedance interactions of a source device and an output device, on an aggregate frequency response, in audio playback of a system. The correction results in perceived sound remaining consistent from any source device and output device combination. The method does not require any hardware modifications and a cloud-based database of source devices and output devices provides corrections for a wide array of possible device pairings.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: February 16, 2016
    Assignee: AUDYSSEY LABORATORIES
    Inventors: Tyson Osborne Yaberg, Tyrone Chen
  • FFT bin based signal limiting
    Patent number: 9210506
    Abstract: Volume extension includes limiting the magnitude of Fast Fourier Transform (FFT) frequency bins which allows increases to the perceived level of audio content without causing distortion. A soft limit and smoothing is applied to each FFT bin is to prevent or reduce distortion while maximizing output volume. Frequency resolution is significantly improved compared to volume extension methods utilizing filterbanks and hard limiting, and distortion is reduced because no hard limiting occurs.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: December 8, 2015
    Assignee: AUDYSSEY LABORATORIES, INC.
    Inventors: Ismael Hamad Nawfal, Ramasamy Govindaraju Balamurali
  • System and Method for Performing Voice Activity Detection
    Publication number: 20130294614
    Abstract: A Voice Activity Detection (VAD) algorithm provides a simple binary signal indicating the presence or absence of speech in a microphone signal. The VAD algorithm includes a first step of noise suppression which both estimates and removes (i.e., filters) ambient noise from the microphone signal to create a filtered signal. The magnitude of the filtered signal is then compared to a threshold in order to produce a VAD output signal. The threshold is dynamic and may be derived either from the filtered signal itself, or from a noise spectrum estimate calculated by the noise suppression step.
    Type: Application
    Filed: May 1, 2012
    Publication date: November 7, 2013
    Applicant: AUDYSSEY LABORATORIES, INC.
    Inventors: Sunil Bharitkar, Nathan Dahlin
  • System and method for automatic multiple listener room acoustic correction with low filter orders
    Patent number: 8005228
    Abstract: A system and a methods for correcting, simultaneously at multiple-listener positions, distortions introduced by the acoustical characteristics includes warping room responses, intelligently weighing the warped room acoustical responses to form a weighted response, a low order spectral fitting to the weighted response, forming a warped filter from the low order spectral fit, and unwarping the warped filter to form the room acoustical correction filter.
    Type: Grant
    Filed: April 10, 2009
    Date of Patent: August 23, 2011
    Assignee: Audyssey Laboratories, Inc.
    Inventors: Sunil Bharitkar, Chris Kyriakakis
  • System and method for automatic multiple listener room acoustic correction with low filter orders
    Patent number: 7567675
    Abstract: A system and a method for correcting, simultaneously at multiple-listener positions, distortions introduced by the acoustical characteristics includes warping room responses, intelligently weighing the warped room acoustical responses to form a weighted response, a low order spectral fitting to the weighted response, forming a warped filter from the low order spectral fit, and unwarping the warped filter to form the room acoustical correction filter.
    Type: Grant
    Filed: November 3, 2003
    Date of Patent: July 28, 2009
    Assignee: Audyssey Laboratories, Inc.
    Inventors: Sunil Bharitkar, Chris Kyriakakis
  • System and method for performing voice activity detection
    Patent number: 9002030
    Abstract: A Voice Activity Detection (VAD) algorithm provides a simple binary signal indicating the presence or absence of speech in a microphone signal. The VAD algorithm includes a first step of noise suppression which both estimates and removes (i.e., filters) ambient noise from the microphone signal to create a filtered signal. The magnitude of the filtered signal is then compared to a threshold in order to produce a VAD output signal. The threshold is dynamic and may be derived either from the filtered signal itself, or from a noise spectrum estimate calculated by the noise suppression step.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: April 7, 2015
    Assignee: Audyssey Laboratories, Inc.
    Inventors: Sunil Bharitkar, Nathan Dahlin
  • System and Method for Performing Automatic Gain Control in Mobile Phone Environments
    Publication number: 20130295868
    Abstract: A Dynamic Noise Compensation (DNC) telephone speech enhancement algorithm addresses the issue of environment noise on the listener end of a telephone call. A single microphone proximal to the listener provides a sample of near end ambient noise level and of near end speech. A Voice Activity Detector (VAD) detects the presence of near end (listener) speech. The DNC algorithm adjusts the far end incoming speech level based on the near end ambient noise and the VAD ensures that the near end listener speech does not effect the incoming speech level adjustment.
    Type: Application
    Filed: May 1, 2012
    Publication date: November 7, 2013
    Applicant: AUDYSSEY LABORATORIES, INC.
    Inventors: Sunil Bharitkar, Nathan Dahlin, Ismael Hamad Nawfal
  • System and method for performing automatic gain control in mobile phone environments
    Patent number: 8639294
    Abstract: A Dynamic Noise Compensation (DNC) telephone speech enhancement algorithm addresses the issue of environment noise on the listener end of a telephone call. A single microphone proximal to the listener provides a sample of near end ambient noise level and of near end speech. A Voice Activity Detector (VAD) detects the presence of near end (listener) speech. The DNC algorithm adjusts the far end incoming speech level based on the near end ambient noise and the VAD ensures that the near end listener speech does not effect the incoming speech level adjustment.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: January 28, 2014
    Assignee: Audyssey Laboratories, Inc.
    Inventors: Sunil Bharitkar, Nathan Dahlin, Ismael Hamad Nawfal
  • Phase equalization for multi-channel loudspeaker-room responses
    Patent number: 7720237
    Abstract: A system and method for minimizing the complex phase interaction between non-coincident subwoofer and satellite speakers for improved magnitude response control in a cross-over region. An all-pass filter is cascaded with bass-management filters in at least one filter channel, and preferably all-pass filters are cascaded in each satellite speaker channel. Pole angles and magnitudes for the all-pass filters are recursively calculated to minimize phase incoherence. A step of selecting an optimal cross-over frequency may be performed in conjunction with the all-pass filtering, and is preferably used to select an optimal cross-over frequency prior to determining all-pass filter coefficients.
    Type: Grant
    Filed: September 7, 2005
    Date of Patent: May 18, 2010
    Assignee: Audyssey Laboratories, Inc.
    Inventors: Sunil Bharitkar, Chris Kyriakakis
  • Phase equalization for multi-channel loudspeaker-room responses
    Patent number: 8218789
    Abstract: A system and method for minimizing the complex phase interaction between non-coincident subwoofer and satellite speakers for improved magnitude response control in a cross-over region. An all-pass filter is cascaded with bass-management filters in at least one filter channel, a[1d preferably all-pass filters are cascaded in each satellite speaker channel. Pole angles and magnitudes for the all-pass filters are recursively calculated to minimize phase incoherence. A step of selecting an optimal cross-over frequency may be performed in conjunction with the all-pass filtering, and is preferably used to select an optimal cross-over frequency prior to determining all-pass filter coefficients.
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: July 10, 2012
    Assignee: Audyssey Laboratories, Inc.
    Inventors: Sunil Bharitkar, Chris Kyriakakis
  • Equalization contouring by a control curve
    Patent number: 9680437
    Abstract: A method for equalization contouring provides a reduction of equalization in certain frequency regions either by user control or by automated selection of frequency, without introducing artifacts. A control curve smoothly scales the magnitude of the equalization in the areas where less equalization is desired to obtain a contoured equalization. The control curve varies by frequency and may be defined specifically for every sampled frequency value of the equalization, may be a continuous function of frequency, or may be a function of control points at a select number of frequency points. The control curve may also have automatic inputs, e.g. a machine-detected cutoff frequency of a speaker may be used to determine a control point in the control curve. As another example, the reverberation time (e.g. RT60) may be used to determine a control point in the control curve. The result is a contoured equalization curve without sudden steps.
    Type: Grant
    Filed: July 21, 2015
    Date of Patent: June 13, 2017
    Assignee: AUDYSSEY LABORATORIES, INC.
    Inventor: Jeffrey Clark
  • Audio content enhancement using bandwidth extension techniques
    Patent number: 8705764
    Abstract: Methods, devices and computer program products facilitate the generation of high quality audio content. The audio content includes upper harmonics that are associated with a bass band of frequencies in order to enhance the perception of bass audio components that cannot be produced by the audio speakers. The upper harmonics are generated and processed in such a way that reduces the computational and memory requirements of the audio processing operations. The processed upper harmonics are combined with the original audio that are properly delayed to enhance the quality of the audio content. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the disclosed subject matter. Therefore, it is to be understood that it should not be used to interpret or limit the scope or the meaning of the claims.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: April 22, 2014
    Assignee: Audyssey Laboratories, Inc.
    Inventors: Sunil Baritkar, Nathan Dahlin, Ismael Hamad Nawfal, Chris Kyriakakis
  • Method for asynchronous impulse response measurement between separately clocked systems
    Patent number: 9170290
    Abstract: A method for measuring acoustic impulse response of a Device Under Test (DUT) addresses sample rate variations by determining clock rate differences between the DUT and test system, and making adjustments to compensate for the different clock rates. An interrogation signal is generated with two “events” spaced a known number of samples apart, at the nominal sampling rate of the DUT. The interrogation signal is played through the DUT and recorded by a measurement system. The number of samples between the two “events” is measured in the sampled signal to determine the shift introduced by the different clock rates. The adjustment is then applied to either the original frequency response measurement signal by adjusting the sampling rate of a frequency response measurement signal to compensate for the different clock rates, or to the measured signal before averaging, to align the samples and prevent cancelling.
    Type: Grant
    Filed: August 23, 2013
    Date of Patent: October 27, 2015
    Assignee: AUDYSSEY LABORATORIES, INC.
    Inventor: Jeffrey Clark
  • Low-frequency range extension and protection system for loudspeakers
    Patent number: 8019088
    Abstract: Low-frequency bandwidth extension in the form of dynamic electrical equalization may be applied to loudspeakers so long as the excursion capability of their drive units as well as velocity limits of any port(s) or excursion limits of any associated passive radiator(s), and the power limits of the drive units are not exceeded. The bandwidth extension maximizes low-frequency bandwidth dynamically such that excursion is fully utilized over a range of drive levels, without exceeding the excursion limit. Additional limiting control is available for port air velocity or passive radiator excursion, and loudspeaker drive unit electrical power. The system applies to open back, closed box, vented box, and more complex box constructions consisting of combinations of these elements for loudspeaker designs using design parameters appropriate to each system.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: September 13, 2011
    Assignee: Audyssey Laboratories, Inc.
    Inventor: Tomlison Holman
  • Cross-over frequency selection and optimization of response around cross-over
    Patent number: 8363852
    Abstract: A system and method provide at least a single stage optimization process which maximizes the flatness of the net subwoofer and satellite speaker response in and around a cross-over region. A first stage determines an optimal cross-over frequency by minimizing an objective function in a region around the cross-over frequency. Such objective function measures the variation of the magnitude response in the cross-over region. An optional second stage applies all-pass filtering to reduce incoherent addition of signals from different speakers in the cross-over region. The all-pass filters are preferably included in signal processing for the satellite speakers, and provide a frequency dependent phase adjustment to reduce incoherency between the center and left and right speakers and the subwoofer. The all-pass filters are derived using a recursive adaptive algorithm.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: January 29, 2013
    Assignee: Audyssey Laboratories, Inc.
    Inventors: Sunil Bharitkar, Chris Kyriakakis, Philip Hilmes, Andrew Dow Turner
  • Audio output device specific audio processing
    Patent number: 9860641
    Abstract: A source device uses a profile of an audio output device (e.g., headphones or speakers) to adjust the acoustic output of the audio output device. A database of audio output device profiles is stored in a cloud or locally on the source device. The profiles may include electroacoustic measurement data characterizing the audio output device or processing parameters for the audio output device. A program running on the source device selects a profile corresponding to the connected audio output device. The profile is used by the software running on the source device to determine processing for an audio stream played by the audio output device. The processing provides equalization to modify the unique audio output device frequency response, and compensation for human perception of sound at different listening levels, and dynamic range adjustment to better match the capabilities of the audio output device.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: January 2, 2018
    Assignee: Audyssey Laboratories, Inc.
    Inventors: Chris Kyriakakis, Kevin Dixon, Tyson Osborne Yaberg, Chandra Rajagopal
  • Volume curve adjustment for signal processing headroom
    Patent number: 9312830
    Abstract: An attenuation control before digital signal processing provides digital headroom. A pre-digital signal processing volume control receives a volume control signal and provides a pre-digital signal processing first attenuation of an input signal before digital signal processing. A master volume control provides a master volume control attenuation after the digital signal processing. The first attenuation may be the same as the master volume control attenuation, or it may be less or more than the master volume control attenuation, depending on the application and desired headroom. The first attenuation and master volume control attenuation may be linearly related or non-linearly related, or not a mathematical function (non-continuous, etc) at all. Changes in the attenuation may be ramped to avoid discontinuities in the signal, preferably over a period between 10 and 100 milliseconds, and are preferably applied as close to simultaneously with master volume changes as possible.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: April 12, 2016
    Assignee: Audyssey Laboratories, Inc.
    Inventor: Jeffrey Clark
  • Background noise measurement from a repeated stimulus measurement system
    Patent number: 9743206
    Abstract: A minimum level for a stimulation signal used in room correction processing is determined by measuring background noise. The stimulation signal is repeated a number of times and resulting responses are recorded. The recording responses are averaged, and the average is subtracted from each recorded response to obtain the background noise present in each recorded response. A stimulation signal to background noise ratio is computed from the stimulation signal and background noise and compared to an SNR threshold to determine if the stimulation signal level is sufficient to support the room correction processing. The background noise may be AC hum introduced electronically into the response signal, acoustic noise introduced by AC ventilation systems or noise emitting devices (refrigerators, etc), and it may be structure-born noise introduced by shaking the microphone, e.g. a bus drives by, shaking the floor the microphone is standing on.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: August 22, 2017
    Assignee: AUDYSSEY LABORATORIES, INC.
    Inventor: Jeffrey Clark
  • Speaker Leak Test System and Method
    Publication number: 20130291624
    Abstract: A speaker leak test system which quickly tests if a speaker enclosure is sealed properly. The speaker leak test system tests for air leaks in the speaker enclosure, which air leaks degrade the acoustic performance of the speaker. A vacuum (or pressure) source is connected through a vacuum hose to the speaker enclosure and vacuum is drawn. After a test vacuum level is reached, the mass air flow through the vacuum hose is measured. If the mass air flow does not exceed a pre-determined speaker dependent threshold for the speaker under test, the speaker is declared to be leak free. A bypass solenoid may reside in parallel with a mass air flow sensor to reach test vacuum quickly. This speaker leak test system is intended to be used in a prototyping and production environment and tests the speaker enclosure for leaks both quickly (e.g., less than five seconds) and accurately.
    Type: Application
    Filed: May 1, 2012
    Publication date: November 7, 2013
    Applicant: AUDYSSEY LABORATORIES, INC.
    Inventor: Tyson Osborne Yaberg
  • Personal audio docking station
    Patent number: D629391
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: December 21, 2010
    Assignee: Audyssey Laboratories, Inc.
    Inventors: Michael Solomon, Chris Kyriakakis, Andrew Dow Turner, Alex Rasmussen, Ted White, Brad Babineaux, Merrick Mosst, Tyson Osborne Yaberg
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