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).
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Publication number: 20240114307Abstract: There is provided encoding and decoding methods for representing spatial audio that is a combination of directional sound and diffuse sound. An exemplary encoding method includes inter alia creating a single- or multi-channel downmix audio signal by downmixing input audio signals from a plurality of microphones in an audio capture unit capturing the spatial audio; determining first metadata parameters associated with the downmix audio signal, wherein the first metadata parameters are indicative of one or more of: a relative time delay value, a gain value, and a phase value associated with each input audio signal; and combining the created downmix audio signal and the first metadata parameters into a representation of the spatial audio.Type: ApplicationFiled: September 12, 2023Publication date: April 4, 2024Applicants: DOLBY INTERNATIONAL AB, DOLBY LABORATORIES LICENSING CORPORATIONInventor: Stefan BRUHN
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Publication number: 20240013793Abstract: Method for encoding scene-based audio is provided. In some implementations, the method involves determining, by an encoder, a spatial direction of a dominant sound component in a frame of an input audio signal. In some implementations, the method involves determining rotation parameters based on the determined spatial direction and a direction preference of a coding scheme to be used to encode the input audio signal. In some implementations, the method involves rotating sound components of the frame based on the rotation parameters such that, after being rotated, the dominant sound component has a spatial direction that aligns with the direction preference of the coding scheme. In some implementations, the method involves encoding the rotated sound components of the frame of the input audio signal using the coding scheme in connection with an indication of the rotation parameters or an indication of the spatial direction of the dominant sound component.Type: ApplicationFiled: December 2, 2021Publication date: January 11, 2024Applicants: Dolby Laboratories Licensing Corporation, DOLBY INTERNATIONAL ABInventors: Stefan BRUHN, Harald MUNDT, David S. MCGRATH, Stefanie BROWN
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Publication number: 20240005933Abstract: The present document describes a method (700) for encoding a multi-channel input signal (201). The method (700) comprises determining (701) a plurality of downmix channel signals (203) from the multi-channel input signal (201) and performing (702) energy compaction of the plurality of downmix channel signals (203) to provide a plurality of compacted channel signals (404). Furthermore, the method (700) comprises determining (703) joint coding metadata (205) based on the plurality of compacted channel signals (404) and based on the multi-channel input signal (201), wherein the joint coding metadata (205) is such that it allows upmixing of the plurality of compacted channel signals (404) to an approximation of the multi-channel input signal (201). In addition, the method (700) comprises encoding (704) the plurality of compacted channel signals (404) and the joint coding metadata (205).Type: ApplicationFiled: July 10, 2023Publication date: January 4, 2024Applicants: DOLBY LABORATORIES LICENSING CORPORATION, DOLBY INTERNATIONAL ABInventors: David S. MCGRATH, Michael ECKERT, Heiko PURNHAGEN, Stefan BRUHN
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Publication number: 20230368802Abstract: 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: ApplicationFiled: May 19, 2023Publication date: November 16, 2023Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventor: Stefan BRUHN
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Publication number: 20230343344Abstract: A method of generating a substitution frame for a lost audio frame of an audio signal is presented. The method may comprise determining an audio filter based on samples of a valid audio frame preceding the lost audio frame. The method may comprise generating the substitution frame based on the audio filter and the samples of the valid audio frame preceding the lost audio frame. The method may be advantageously applied to a low frequency effects (LFE) channel of a multi-channel audio signal.Type: ApplicationFiled: June 10, 2021Publication date: October 26, 2023Applicant: DOLBY INTERNATIONAL ABInventor: Stefan BRUHN
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Patent number: 11765536Abstract: There is provided encoding and decoding methods for representing spatial audio that is a combination of directional sound and diffuse sound. An exemplary encoding method includes inter alia creating a single- or multi-channel downmix audio signal by downmixing input audio signals from a plurality of microphones in an audio capture unit capturing the spatial audio; determining first metadata parameters associated with the downmix audio signal, wherein the first metadata parameters are indicative of one or more of: a relative time delay value, a gain value, and a phase value associated with each input audio signal; and combining the created downmix audio signal and the first metadata parameters into a representation of the spatial audio.Type: GrantFiled: November 12, 2019Date of Patent: September 19, 2023Assignees: DOLBY LABORATORIES LICENSING CORPORATION, DOLBY INTERNATIONAL ABInventor: Stefan Bruhn
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Publication number: 20230274748Abstract: A method 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: ApplicationFiled: February 16, 2023Publication date: August 31, 2023Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Harald POBLOTH, Stefan BRUHN
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Publication number: 20230267938Abstract: Described are methods of processing an audio signal for packet loss concealment. The audio signal comprises a sequence of frames, each frame containing representations of a plurality of audio channels and reconstruction parameters for upmixing the plurality of audio channels to a predetermined channel format. One method includes: receiving the audio signal; and generating a reconstructed audio signal in the predefined channel format based on the received audio signal. Generating the reconstructed audio signal comprises: determining whether at least one frame of the audio signal has been lost; and if a number of consecutively lost frames exceeds a first threshold, fading the reconstructed audio signal to a predefined spatial configuration. Also described is a method of encoding an audio signal. Yet further described are apparatus for carrying out the methods, as well as corresponding programs and computer-readable storage media.Type: ApplicationFiled: July 7, 2021Publication date: August 24, 2023Applicant: DOLBY INTERNATIONAL ABInventors: Harald MUNDT, Stefan BRUHN, Heiko PURNHAGEN, Simon PLAIN, Michael SCHUG
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Patent number: 11729079Abstract: 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: GrantFiled: May 11, 2021Date of Patent: August 15, 2023Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventor: Stefan Bruhn
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Patent number: 11699451Abstract: The present document describes a method (700) for encoding a multi-channel input signal (201). The method (700) comprises determining (701) a plurality of downmix channel signals (203) from the multi-channel input signal (201) and performing (702) energy compaction of the plurality of downmix channel signals (203) to provide a plurality of compacted channel signals (404). Furthermore, the method (700) comprises determining (703) joint coding metadata (205) based on the plurality of compacted channel signals (404) and based on the multi-channel input signal (201), wherein the joint coding metadata (205) is such that it allows upmixing of the plurality of compacted channel signals (404) to an approximation of the multi-channel input signal (201). In addition, the method (700) comprises encoding (704) the plurality of compacted channel signals (404) and the joint coding metadata (205).Type: GrantFiled: July 2, 2019Date of Patent: July 11, 2023Assignees: Dolby Laboratories Licensing Corporation, Dolby International ABInventors: David S. McGrath, Michael Eckert, Heiko Purnhagen, Stefan Bruhn
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Patent number: 11694699Abstract: 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: GrantFiled: July 21, 2021Date of Patent: July 4, 2023Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventor: Stefan Bruhn
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Publication number: 20230080183Abstract: Transmitting node and receiving node for audio coding and methods therein. The nodes being operable to encode/decode speech and to apply a discontinuous transmission (DTX) scheme comprising transmission/reception of Silence Insertion Descriptor (SID) frames during speech inactivity. The method in the transmitting node comprising determining, from amongst a number N of hangover frames, a set Y of frames being representative of background noise, and further transmitting the N hangover frames, comprising at least said set Y of frames, to the receiving node. The method further comprises transmitting a first SID frame to the receiving node in association with the transmission of the N hangover frames, where the SID frame comprises information indicating the determined set Y of hangover frames to the receiving node. The method enables the receiving node to generate comfort noise based on the hangover frames most adequate for the purpose.Type: ApplicationFiled: September 20, 2022Publication date: March 16, 2023Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Stefan BRUHN, Tomas JANSSON TOFTGÅRD, Martin Sehlstedt
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Publication number: 20230072546Abstract: A method performed by an encoder. The method comprises determining envelope representation residual coefficients as first compressed envelope representation coefficients subtracted from the input envelope representation coefficients. The method comprises transforming the envelope representation residual coefficients into a warped domain so as to obtain transformed envelope representation residual coefficients. The method comprises applying, at least one of a plurality of gain-shape coding schemes on the transformed envelope representation residual coefficients in order to achieve gain-shape coded envelope representation residual coefficients, where the plurality of gain-shape coding schemes have mutually different trade-offs in one or more of gain resolution and shape resolution for one or more of the transformed envelope representation residual coefficients.Type: ApplicationFiled: August 22, 2022Publication date: March 9, 2023Inventors: Jonas SVEDBERG, Stefan BRUHN, Martin SEHLSTEDT
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Publication number: 20230008547Abstract: Concealing a lost audio frame of a received audio signal is provided 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: ApplicationFiled: September 20, 2022Publication date: January 12, 2023Inventor: Stefan BRUHN
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Publication number: 20220375480Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for controlling a concealment method for a lost audio frame of a received audio signal. A method for a decoder of concealing a lost audio frame comprises detecting in a property of the previously received and reconstructed audio signal, or in a statistical property of observed frame losses, a condition for which the substitution of a lost frame provides relatively reduced quality. In case such a condition is detected, the concealment method is modified by selectively adjusting a phase or a spectrum magnitude of a substitution frame spectrum.Type: ApplicationFiled: July 29, 2022Publication date: November 24, 2022Inventors: Stefan BRUHN, Jonas SVEDBERG
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Publication number: 20220375482Abstract: The disclosed embodiments enable converting audio signals captured in various formats by various capture devices into a limited number of formats that can be processed by an audio codec (e.g., an Immersive Voice and Audio Services (IVAS) codec). In an embodiment, a simplification unit of the audio device receives an audio signal captured by one or more audio capture devices coupled to the audio device. The simplification unit determines whether the audio signal is in a format that is supported/not supported by an encoding unit of the audio device. Based on the determining, the simplification unit, converts the audio signal into a format that is supported by the encoding unit. In an embodiment, if the simplification unit determines that the audio signal is in a spatial format, the simplification unit can convert the audio signal into a spatial “mezzanine” format supported by the encoding.Type: ApplicationFiled: August 8, 2022Publication date: November 24, 2022Applicants: Dolby Laboratories Licensing Corporation, Dolby International ABInventors: Stefan BRUHN, Michael ECKERT, Juan Felix TORRES, Stefanie BROWN, David S. MCGRATH
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Patent number: 11482232Abstract: Concealing a lost audio frame of a received audio signal is provided by performing a sinusoidal analysis (81) 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 (83) 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: GrantFiled: May 16, 2019Date of Patent: October 25, 2022Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventor: Stefan Bruhn
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Patent number: 11475903Abstract: Transmitting node and receiving node for audio coding and methods therein. The nodes being operable to encode/decode speech and to apply a discontinuous transmission (DTX) scheme comprising transmission/reception of Silence Insertion Descriptor (SID) frames during speech inactivity. The method in the transmitting node comprising determining, from amongst a number N of hangover frames, a set Y of frames being representative of background noise, and further transmitting the N hangover frames, comprising at least said set Y of frames, to the receiving node. The method further comprises transmitting a first SID frame to the receiving node in association with the transmission of the N hangover frames, where the SID frame comprises information indicating the determined set Y of hangover frames to the receiving node. The method enables the receiving node to generate comfort noise based on the hangover frames most adequate for the purpose.Type: GrantFiled: May 10, 2019Date of Patent: October 18, 2022Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Stefan Bruhn, Tomas Jansson Toftgård, Martin Sehlstedt
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Patent number: 11463833Abstract: A method and apparatus for voice or sound activity detection for spatial audio. The method comprises receiving direct source information source detection decision and a primary voice/sound activity decision, and producing a spatial voice/sound activity decision based on the direct source detection decision and the primary voice/sound activity decision.Type: GrantFiled: May 18, 2017Date of Patent: October 4, 2022Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Erik Norvell, Stefan Bruhn
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Patent number: 11437047Abstract: In accordance with an example embodiment of the present invention, disclosed is a method and an apparatus thereof for controlling a concealment method for a lost audio frame of a received audio signal. A method for a decoder of concealing a lost audio frame comprises detecting in a property of the previously received and reconstructed audio signal, or in a statistical property of observed frame losses, a condition for which the substitution of a lost frame provides relatively reduced quality. In case such a condition is detected, the concealment method is modified by selectively adjusting a phase or a spectrum magnitude of a substitution frame spectrum.Type: GrantFiled: December 19, 2019Date of Patent: September 6, 2022Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Stefan Bruhn, Jonas Svedberg