Patents by Inventor Stefan Bruhn

Stefan Bruhn has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Audio Signal Classification and Coding
    Publication number: 20190057708
    Abstract: The invention relates to a codec and a signal classifier and methods therein for signal classification and selection of a coding mode based on audio signal characteristics. A method embodiment to be performed by a decoder comprises, for a frame m: determining a stability value D(m) based on a difference, in a transform domain, between a range of a spectral envelope of frame m and a corresponding range of a spectral envelope of an adjacent frame m?1. Each such range comprises a set of quantized spectral envelope values related to the energy in spectral bands of a segment of the audio signal. The method further comprises selecting a decoding mode, out of a plurality of decoding modes, based on the stability value D(m); and applying the selected decoding mode.
    Type: Application
    Filed: October 22, 2018
    Publication date: February 21, 2019
    Inventors: Erik Norvell, Stefan Bruhn
  • Selecting a Packet Loss Concealment Procedure
    Publication number: 20190028373
    Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for selecting a packet loss concealment procedure for a lost audio frame of a received audio signal. A method for selecting a packet loss concealment procedure comprises detecting an audio type of a received audio frame and determining a packet loss concealment procedure based on the audio type. In the method, detecting an audio type comprises determining a stability of a spectral envelope of signals of received audio frames.
    Type: Application
    Filed: September 12, 2018
    Publication date: January 24, 2019
    Inventor: Stefan Bruhn
  • HYBRID RTP PAYLOAD FORMAT
    Publication number: 20190005975
    Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for formatting a payload for transmission of multi-mode speech/audio codec data. The method comprises deciding whether a header-less or a header-full payload format is used for transmission of a coded frame. The decision is based on a codec mode and a required functionality. The payload data is packetized with or without the payload header depending on the decision.
    Type: Application
    Filed: August 21, 2018
    Publication date: January 3, 2019
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Stefan BRUHN
  • CODING OF MULTI-CHANNEL AUDIO SIGNALS
    Publication number: 20180358024
    Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for assisting a selection of an encoding mode for a multi-channel audio signal encoding where different encoding modes may be chosen for the different channels. The method is performed in an audio encoder and comprises obtaining a plurality of audio signal channels and coordinating or synchronizing the selection of an encoding mode for a plurality of the obtained channels, wherein the coordination is based on an encoding mode selected for one of the obtained channels or for a group of the obtained channels.
    Type: Application
    Filed: May 19, 2016
    Publication date: December 13, 2018
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Harald POBLOTH, Stefan BRUHN
  • Method and apparatus for removing jitter in audio data transmission
    Patent number: 10148391
    Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for removing jitter introduced by a packet switched network. Each received audio frame comprises a primary portion and a redundancy portion. The redundancy portion comprises a partial redundant copy of a previous frame that is offset by k frames. If a frame n is lost, a frame n+k that comprises the partial redundant copy of the lost frame n, is located in a jitter buffer. Based on the frame n+k, a substitute frame n? substituting the lost frame n is created and a substitution indicator of the substitute frame n? is set to indicate that the redundancy portion of the substitute fame n? should be used in decoding.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: December 4, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Stefan Bruhn, Tomas Frankkila, Karl Hellwig
  • METHOD AND APPARATUS FOR REMOVING JITTER IN AUDIO DATA TRANSMISSION
    Publication number: 20180343086
    Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for removing jitter introduced by a packet switched network. Each received audio frame comprises a primary portion and a redundancy portion. The redundancy portion comprises a partial redundant copy of a previous frame that is offset by k frames. If a frame n is lost, a frame n+k that comprises the partial redundant copy of the lost frame n, is located in a jitter buffer. Based on the frame n+k, a substitute frame n? substituting the lost frame n is created and a substitution indicator of the substitute frame n? is set to indicate that the redundancy portion of the substitute fame n? should be used in decoding.
    Type: Application
    Filed: July 13, 2018
    Publication date: November 29, 2018
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Stefan BRUHN, Tomas FRANKKILA, Karl HELLWIG
  • Hybrid RTP payload format
    Patent number: 10121483
    Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for formatting a payload for transmission of multi-mode speech/audio codec data. The method comprises deciding whether a header-less or a header-full payload format is used for transmission of a coded frame. The decision is based on a codec mode and a required functionality. The payload data is packetized with or without the payload header depending on the decision.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: November 6, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
    Inventor: Stefan Bruhn
  • Audio signal classification and coding
    Patent number: 10121486
    Abstract: The invention relates to a codec and a signal classifier and methods therein for signal classification and selection of a coding mode based on audio signal characteristics. A method embodiment to be performed by a decoder comprises, for a frame m: determining a stability value D(m) based on a difference, in a transform domain, between a range of a spectral envelope of frame m and a corresponding range of a spectral envelope of an adjacent frame m?1. Each such range comprises a set of quantized spectral envelope values related to the energy in spectral bands of a segment of the audio signal. The method further comprises selecting a decoding mode, out of a plurality of decoding modes, based on the stability value D(m); and applying the selected decoding mode.
    Type: Grant
    Filed: October 30, 2017
    Date of Patent: November 6, 2018
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Erik Norvell, Stefan Bruhn
  • Selecting a packet loss concealment procedure
    Patent number: 10103958
    Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for selecting a packet loss concealment procedure for a lost audio frame of a received audio signal. A method for selecting a packet loss concealment procedure comprises detecting an audio type of a received audio frame and determining a packet loss concealment procedure based on the audio type. In the method, detecting an audio type comprises determining a stability of a spectral envelope of signals of received audio frames.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: October 16, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventor: Stefan Bruhn
  • Hybrid RTP payload format
    Patent number: 10083704
    Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for formatting a payload for transmission of multi-mode speech/audio codec data. The method comprises deciding whether a header-less or a header-full payload format is used for transmission of a coded frame. The decision is based on a codec mode and a required functionality. The payload data is packetized with or without the payload header depending on the decision.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: September 25, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
    Inventor: Stefan Bruhn
  • Method and arrangement for providing a backwards compatible payload format
    Patent number: 10068581
    Abstract: In a method of providing a backward and forward compatible speech codec payload format, performing the steps of providing a RTP package. Subsequently, including payload according to a first codec into the provided RTP package, and appending payload according to a second codec into the provided RTP package. In addition, locating at least one unused bit in the included first codec payload, and designating the located at least one unused bit as a codec compatibility bit. Finally, utilizing the designated at least one codec compatibility bit to provide an indication of the presence of the appended second codec payload.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: September 4, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Tomas Frankkila, Stefan Bruhn, Daniel Enström
  • BURST FRAME ERROR HANDLING
    Publication number: 20180182401
    Abstract: There is provided mechanisms for frame loss concealment. A method is performed by a receiving entity. The method comprises adding, in association with constructing a substitution frame for a lost frame, a noise component to the substitution frame. The noise component has a frequency characteristic corresponding to a low-resolution spectral representation of a signal in a previously received frame.
    Type: Application
    Filed: February 22, 2018
    Publication date: June 28, 2018
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Stefan Bruhn
  • Burst frame error handling
    Patent number: 9972327
    Abstract: There is provided mechanisms for frame loss concealment. A method is performed by a receiving entity. The method comprises adding, in association with constructing a substitution frame for a lost frame, a noise component to the substitution frame. The noise component has a frequency characteristic corresponding to a low-resolution spectral representation of a signal in a previously received frame.
    Type: Grant
    Filed: June 8, 2015
    Date of Patent: May 15, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventor: Stefan Bruhn
  • AUDIO FRAME LOSS CONCEALMENT
    Publication number: 20180096691
    Abstract: Concealing a lost audio frame of a received audio signal by performing a sinusoidal analysis of a part of a previously received or reconstructed audio signal, wherein the sinusoidal analysis involves identifying frequencies of sinusoidal components of the audio signal, applying a sinusoidal model on a segment of the previously received or reconstructed audio signal, wherein said segment is used as a prototype frame in order to create a substitution frame for a lost audio frame, and creating the substitution frame for the lost audio frame by time-evolving sinusoidal components of the prototype frame, up to the time instance of the lost audio frame, in response to the corresponding identified frequencies.
    Type: Application
    Filed: November 10, 2017
    Publication date: April 5, 2018
    Inventor: Stefan Bruhn
  • METHOD AND ARRANGEMENT FOR CONTROLLING SMOOTHING OF STATIONARY BACKGROUND NOISE
    Publication number: 20180075854
    Abstract: In a method for coding of information for enhancing a background noise representation, voice activity of an input speech signal is determined. A noisiness parameter is determined for an inactive speech signal, wherein the noisiness parameter is based on a ratio of prediction gains of two Linear Predictive Coder (LPC) prediction filters with different orders. The noisiness parameter is quantized, and the quantized noisiness parameter is encoded for transmission.
    Type: Application
    Filed: November 19, 2017
    Publication date: March 15, 2018
    Inventor: Stefan Bruhn
  • Rate control in circuit switched systems
    Patent number: 9917673
    Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for handling codec rate adaptation in a communication network applying circuit switched communication. The method is performed by a wireless device. The method comprises receiving an indication of a codec mode and determining a codec mode subset based on the indicated codec mode. Rate adaptation is applied based on the codec modes comprised in the determined codec mode subset having a bit rate below or equal to a bit rate associated with the indicated codec mode.
    Type: Grant
    Filed: March 10, 2016
    Date of Patent: March 13, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Stefan Bruhn, Maria Hultström, Karl Hellwig
  • Audio Signal Classification and Coding
    Publication number: 20180047404
    Abstract: The invention relates to a codec and a signal classifier and methods therein for signal classification and selection of a coding mode based on audio signal characteristics. A method embodiment to be performed by a decoder comprises, for a frame m: determining a stability value D(m) based on a difference, in a transform domain, between a range of a spectral envelope of frame m and a corresponding range of a spectral envelope of an adjacent frame m?1. Each such range comprises a set of quantized spectral envelope values related to the energy in spectral bands of a segment of the audio signal. The method further comprises selecting a decoding mode, out of a plurality of decoding modes, based on the stability value D(m); and applying the selected decoding mode.
    Type: Application
    Filed: October 30, 2017
    Publication date: February 15, 2018
    Inventors: Erik Norvell, Stefan Bruhn
  • METHOD AND APPARATUS FOR REMOVING JITTER IN AUDIO DATA TRANSMISSION
    Publication number: 20180026746
    Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for removing jitter introduced by a packet switched network. Each received audio frame comprises a primary portion and a redundancy portion. The redundancy portion comprises a partial redundant copy of a previous frame that is offset by k frames. If a frame n is lost, a frame n+k that comprises the partial redundant copy of the lost frame n, is located in a jitter buffer. Based on the frame n+k, a substitute frame n? substituting the lost frame n is created and a substitution indicator of the substitute frame n? is set to indicate that the redundancy portion of the substitute fame n? should be used in decoding.
    Type: Application
    Filed: September 15, 2016
    Publication date: January 25, 2018
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Stefan BRUHN, Tomas FRANKKILA, Karl HELLWIG
  • Method and arrangement for controlling smoothing of stationary background noise
    Patent number: 9852739
    Abstract: In a method for coding of information for enhancing a background noise representation, voice activity of an input speech signal is determined. A noisiness parameter is determined for an inactive speech signal, wherein the noisiness parameter is based on a ratio of prediction gains of two Linear Predictive Coder (LPC) prediction filters with different orders. The noisiness parameter is quantized, and the quantized noisiness parameter is encoded for transmission.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: December 26, 2017
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Stefan Bruhn
  • Audio frame loss concealment
    Patent number: 9847086
    Abstract: Concealing a lost audio frame of a received audio signal by performing a sinusoidal analysis of a part of a previously received or reconstructed audio signal, wherein the sinusoidal analysis involves identifying frequencies of sinusoidal components of the audio signal, applying a sinusoidal model on a segment of the previously received or reconstructed audio signal, wherein said segment is used as a prototype frame in order to create a substitution frame for a lost audio frame, and creating the substitution frame for the lost audio frame by time-evolving sinusoidal components of the prototype frame, up to the time instance of the lost audio frame, in response to the corresponding identified frequencies.
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: December 19, 2017
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventor: Stefan Bruhn