Patents Assigned to SRS Labs, Inc.
  • Publication number: 20130272542
    Abstract: A method of adjusting a loudness of an audio signal in real time may include receiving an electronic audio signal and dividing the audio signal into a plurality of frames. Processing of the frames may be performed in real time. The processing may include measuring initial loudness values for blocks of samples in a frame to produce a plurality of initial loudness values, and computing a weighted average of at least some of the initial loudness values. The weights may be selected based on one or more of the recency of the initial loudness values, variation of the initial loudness values, and estimated information content of the audio signal. The processing may further include selectively discarding at least some of the loudness values that reach an adaptive loudness threshold. Weights can be adjusted based on the variation of the loudness values of the audio signal.
    Type: Application
    Filed: April 12, 2012
    Publication date: October 17, 2013
    Applicant: SRS LABS, INC.
    Inventor: JAMES TRACEY
  • Publication number: 20130272543
    Abstract: A method of adjusting a loudness of an audio signal in real time may include receiving an electronic audio signal and dividing the audio signal into a plurality of frames. Processing of the frames may be performed in real time. The processing may include measuring initial loudness values for blocks of samples in a frame to produce a plurality of initial loudness values, and computing a weighted average of at least some of the initial loudness values. The weights may be selected based on one or more of the recency of the initial loudness values, variation of the initial loudness values, and estimated information content of the audio signal. The processing may further include selectively discarding at least some of the loudness values that reach an adaptive loudness threshold. Weights can be adjusted based on the variation of the loudness values of the audio signal.
    Type: Application
    Filed: April 20, 2012
    Publication date: October 17, 2013
    Applicant: SRS LABS, INC.
    Inventor: JAMES TRACEY
  • Publication number: 20130016854
    Abstract: An audio system is provided that employs time-frequency analysis and/or synthesis techniques for processing audio obtained from a microphone array. These time-frequency analysis/synthesis techniques can be more robust, provide better spatial resolution, and have less computational complexity than existing adaptive filter implementations. The time-frequency techniques can be implemented for dual microphone arrays or for microphone arrays having more than two microphones. Many different time-frequency techniques may be used in the audio system. As one example, the Gabor transform may be used to analyze time and frequency components of audio signals obtained from the microphone array.
    Type: Application
    Filed: July 12, 2012
    Publication date: January 17, 2013
    Applicant: SRS LABS, INC.
    Inventors: Zhonghou Zheng, Shie Qian
  • Publication number: 20120259625
    Abstract: An adaptive audio system can be implemented in a communication device. The adaptive audio system can enhance voice in an audio signal received by the communication device to increase intelligibility of the voice. The audio system can adapt the audio enhancement based at least in part on levels of environmental content, such as noise, that are received by the communication device. For higher levels of environmental content, for example, the audio system might apply the audio enhancement more aggressively. Additionally, the adaptive audio system can detect substantially periodic content in the environmental content. The adaptive audio system can further adapt the audio enhancement responsive to the environmental content.
    Type: Application
    Filed: June 18, 2012
    Publication date: October 11, 2012
    Applicant: SRS LABS, INC.
    Inventors: Jun Yang, Richard J. Oliver, James Tracey, Xing He
  • Publication number: 20120250895
    Abstract: A method of adjusting a loudness of an audio signal may include receiving an electronic audio signal and using one or more processors to process at least one channel of the audio signal to determine a loudness of a portion of the audio signal. This processing may include processing the channel with a plurality of approximation filters that can approximate a plurality of auditory filters that further approximate a human hearing system. In addition, the method may include computing at least one gain based at least in part on the determined loudness to cause a loudness of the audio signal to remain substantially constant for a period of time. Moreover, the method may include applying the gain to the electronic audio signal.
    Type: Application
    Filed: June 18, 2012
    Publication date: October 4, 2012
    Applicant: SRS LABS, INC.
    Inventor: Themis Katsianos
  • Publication number: 20120230497
    Abstract: Embodiments of systems and methods are described for providing backwards compatibility for legacy devices that are unable to natively render non-channel based audio objects. These systems and methods can also be beneficially used to produce a reduced set of audio objects for compatible object-based decoders with low computing resources.
    Type: Application
    Filed: March 8, 2012
    Publication date: September 13, 2012
    Applicant: SRS Labs, Inc.
    Inventors: Roger Wallace Dressler, Pierre-Anthony Stivell Lemieux, Alan D. Kraemer
  • Publication number: 20120232910
    Abstract: Embodiments of systems and methods are described for providing backwards compatibility for legacy devices that are unable to natively render non-channel based audio objects. These systems and methods can also be beneficially used to produce a reduced set of audio objects for compatible object-based decoders with low computing resources.
    Type: Application
    Filed: March 8, 2012
    Publication date: September 13, 2012
    Applicant: SRS Labs, Inc.
    Inventors: Roger Wallace Dressler, Pierre-Anthony Stivell Lemieux, Alan D. Kraemer
  • Patent number: 8229124
    Abstract: A method of adjusting a loudness of an audio signal may include receiving an electronic audio signal and using one or more processors to process at least one channel of the audio signal to determine a loudness of a portion of the audio signal. This processing may include processing the channel with a plurality of approximation filters that can approximate a plurality of auditory filters that further approximate a human hearing system. In addition, the method may include computing at least one gain based at least in part on the determined loudness to cause a loudness of the audio signal to remain substantially constant for a period of time. Moreover, the method may include applying the gain to the electronic audio signal.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: July 24, 2012
    Assignee: SRS Labs, Inc.
    Inventor: Themis Katsianos
  • Publication number: 20120170756
    Abstract: A depth processing system can employ stereo speakers to achieve immersive effects. The depth processing system can advantageously manipulate phase and/or amplitude information to render audio along a listener's median plane, thereby rendering audio along varying depths. In one embodiment, the depth processing system analyzes left and right stereo input signals to infer depth, which may change over time. The depth processing system can then vary the phase and/or amplitude decorrelation between the audio signals over time to enhance the sense of depth already present in the audio signals, thereby creating an immersive depth effect.
    Type: Application
    Filed: January 3, 2012
    Publication date: July 5, 2012
    Applicant: SRS LABS, INC.
    Inventors: Alan D. Kraemer, James Tracey, Themis Katsianos
  • Publication number: 20120170759
    Abstract: A system and method for enhancement and management of streaming audio is disclosed. In one embodiment, the system provides a client-side decoder that is compatible with numerous audio formats, so that a user can enjoy relatively high-quality audio from various sources, even from sources that do not provide multi-channel or high-quality audio data. The system and method also include a management system for managing and controlling the use of licensed signal processing software to further enhance an audio stream. In one embodiment, the management system is used to manage a signal processing module that provides psychoacoustic audio processing to create a wider soundstage, an acoustic correction process to increase the perceived height and clarity of the audio image, and bass enhancement processing to create the perception of low bass from the small speakers or headphones typically used with multi-media systems and portable audio players.
    Type: Application
    Filed: March 12, 2012
    Publication date: July 5, 2012
    Applicant: SRS LABS, INC
    Inventors: Thomas C.K. Yuen, Alan D. Kraemer, Charles R. Cortright, JR., Jeffrey M. Claar
  • Publication number: 20120170757
    Abstract: A depth processing system can employ stereo speakers to achieve immersive effects. The depth processing system can advantageously manipulate phase and/or amplitude information to render audio along a listener's median plane, thereby rendering audio along varying depths. In one embodiment, the depth processing system analyzes left and right stereo input signals to infer depth, which may change over time. The depth processing system can then vary the phase and/or amplitude decorrelation between the audio signals over time to enhance the sense of depth already present in the audio signals, thereby creating an immersive depth effect.
    Type: Application
    Filed: January 3, 2012
    Publication date: July 5, 2012
    Applicant: SRS LABS, INC.
    Inventors: Alan D. Kraemer, James Tracey, Themis Katsianos
  • Patent number: 8204742
    Abstract: An adaptive audio system can be implemented in a communication device. The adaptive audio system can enhance voice in an audio signal received by the communication device to increase intelligibility of the voice. The audio system can adapt the audio enhancement based at least in part on levels of environmental content, such as noise, that are received by the communication device. For higher levels of environmental content, for example, the audio system might apply the audio enhancement more aggressively. Additionally, the adaptive audio system can detect substantially periodic content in the environmental content. The adaptive audio system can further adapt the audio enhancement responsive to the environmental content.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: June 19, 2012
    Assignee: SRS Labs, Inc.
    Inventors: Jun Yang, Richard J. Oliver, James Tracey
  • Publication number: 20120099733
    Abstract: A stereo widening system and associated signal processing algorithms are described herein that can, in several embodiments, widen a stereo image with fewer processing resources than existing crosstalk cancellation systems. These system and algorithms can advantageously be implemented in a handheld device or other device with speakers placed close together, thereby improving the stereo effect produced with such devices at lower computational cost. However, the systems and algorithms described herein are not limited to handheld devices, but can more generally be implemented in any device with multiple speakers.
    Type: Application
    Filed: October 20, 2011
    Publication date: April 26, 2012
    Applicant: SRS LABS, INC.
    Inventors: Wen Wang, James Tracey, Robert C. Maling, III, Themis Katsianos
  • Publication number: 20120014528
    Abstract: Systems and methods for audio signal processing are disclosed, where a discrete number of simple digital filters are generated for particular portions of an audio frequency range. Studies have shown that certain frequency ranges are particularly important for human ears' location-discriminating capability, while other ranges are generally ignored. Head-Related Transfer Functions (HRTFs) are examples response functions that characterize how ears perceive sound positioned at different locations. By selecting one or more “location-critical” portions of such response functions, one can construct simple filters that can be used to simulate hearing where location-discriminating capability is substantially maintained. Because the filters can be simple, they can be implemented in devices having limited computing power and resources to provide location-discrimination responses that form the basis for many desirable audio effects.
    Type: Application
    Filed: September 23, 2011
    Publication date: January 19, 2012
    Applicant: SRS LABS, INC.
    Inventor: Wen Wang
  • Publication number: 20110286602
    Abstract: A system and method for enhancement and management of streaming audio is disclosed. In one embodiment, the system provides a client-side decoder that is compatible with numerous audio formats, so that a user can enjoy relatively high-quality audio from various sources, even from sources that do not provide multi-channel or high-quality audio data. The system and method also include a management system for managing and controlling the use of licensed signal processing software to further enhance an audio stream. In one embodiment, the management system is used to manage a signal processing module that provides psychoacoustic audio processing to create a wider soundstage, an acoustic correction process to increase the perceived height and clarity of the audio image, and bass enhancement processing to create the perception of low bass from the small speakers or headphones typically used with multi-media systems and portable audio players.
    Type: Application
    Filed: August 3, 2011
    Publication date: November 24, 2011
    Applicant: SRS LABS, INC
    Inventors: Thomas C.K. Yuen, Alan D. Kraemer, Charles R. Cortright, JR., Jeffrey M. Claar
  • Publication number: 20110274279
    Abstract: A system and method for enhancement and management of streaming audio is disclosed. In one embodiment, the system provides a client-side decoder that is compatible with numerous audio formats, so that a user can enjoy relatively high-quality audio from various sources, even from sources that do not provide multi-channel or high-quality audio data. The system and method also include a management system for managing and controlling the use of licensed signal processing software to further enhance an audio stream. In one embodiment, the management system is used to manage a signal processing module that provides psychoacoustic audio processing to create a wider soundstage, an acoustic correction process to increase the perceived height and clarity of the audio image, and bass enhancement processing to create the perception of low bass from the small speakers or headphones typically used with multi-media systems and portable audio players.
    Type: Application
    Filed: July 11, 2011
    Publication date: November 10, 2011
    Applicant: SRS LABS, INC
    Inventors: Thomas C.K. Yuen, Alan D. Kraemer, Charles R. Cortright, JR., Jeffrey M. Claar
  • Patent number: 8050434
    Abstract: A method for processing audio signals can include receiving left and right front audio signals, where the left and right front audio signals including information about front spatial position of sound sources relative to a listener. The method can also include receiving left and right rear audio signals, where the left and right rear audio signals include information about rear spatial position of sound sources relative to a listener. In addition, the method can include applying at least one front perspective filter to each of the left and right front audio signals to yield filtered left and right front output signals, where the left and right front output signals each drive a front speaker.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: November 1, 2011
    Assignee: SRS Labs, Inc.
    Inventors: Hideaki Kato, Alan Kraemer, Sarah Yang
  • Patent number: 8046093
    Abstract: A system and method for enhancement and management of streaming audio is disclosed. In one embodiment, the system provides a client-side decoder that is compatible with numerous audio formats, so that a user can enjoy relatively high-quality audio from various sources, even from sources that do not provide multi-channel or high-quality audio data. The system and method also include a management system for managing and controlling the use of licensed signal processing software to further enhance an audio stream. In one embodiment, the management system is used to manage a signal processing module that provides psychoacoustic audio processing to create a wider soundstage, an acoustic correction process to increase the perceived height and clarity of the audio image, and bass enhancement processing to create the perception of low bass from the small speakers or headphones typically used with multi-media systems and portable audio players.
    Type: Grant
    Filed: December 8, 2008
    Date of Patent: October 25, 2011
    Assignee: SRS Labs, Inc.
    Inventors: Thomas C. K. Yuen, Alan D. Kraemer, Charles R. Cortright, Jeffrey M. Claar
  • Patent number: 8027477
    Abstract: Systems and methods for audio signal processing are disclosed, where a discrete number of simple digital filters are generated for particular portions of an audio frequency range. Studies have shown that certain frequency ranges are particularly important for human ears' location-discriminating capability, while other ranges are generally ignored. Head-Related Transfer Functions (HRTFs) are examples response functions that characterize how ears perceive sound positioned at different locations. By selecting one or more “location-critical” portions of such response functions, one can construct simple filters that can be used to simulate heating where location-discriminating capability is substantially maintained. Because the filters can be simple, they can be implemented in devices having limited computing power and resources to provide location-discrimination responses that form the basis for many desirable audio effects.
    Type: Grant
    Filed: September 13, 2006
    Date of Patent: September 27, 2011
    Assignee: SRS Labs, Inc.
    Inventor: Wen Wang
  • Patent number: 7987281
    Abstract: A system and method for enhancement and management of streaming audio is disclosed. In one embodiment, the system provides a client-side decoder that is compatible with numerous audio formats, so that a user can enjoy relatively high-quality audio from various sources, even from sources that do not provide multi-channel or high-quality audio data. The system and method also include a management system for managing and controlling the use of licensed signal processing software to further enhance an audio stream. In one embodiment, the management system is used to manage a signal processing module that provides psychoacoustic audio processing to create a wider soundstage, an acoustic correction process to increase the perceived height and clarity of the audio image, and bass enhancement processing to create the perception of low bass from the small speakers or headphones typically used with multi-media systems and portable audio players.
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: July 26, 2011
    Assignee: SRS Labs, Inc.
    Inventors: Thomas C. K. Yuen, Alan D. Kraemer, Charles R. Cortright, Jr., Jeffrey M. Claar