Patents by Inventor Erik Norvell
Erik Norvell 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: 20250046322Abstract: A gain adjustment apparatus for use in decoding of audio that has been encoded with separate gain and shape representations includes an accuracy meter configured to estimate an accuracy measure of the shape representation, and to determine a gain correction based on the estimated accuracy measure. An envelope adjuster further included in the apparatus is configured to adjust the gain representation based on the determined gain correction.Type: ApplicationFiled: October 24, 2024Publication date: February 6, 2025Inventors: Erik Norvell, Volodya Grancharov
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Patent number: 12159639Abstract: A gain adjustment apparatus for use in decoding of audio that has been encoded with separate gain and shape representations includes an accuracy meter configured to estimate an accuracy measure of the shape representation, and to determine a gain correction based on the estimated accuracy measure. An envelope adjuster further included in the apparatus is configured to adjust the gain representation based on the determined gain correction.Type: GrantFiled: May 27, 2021Date of Patent: December 3, 2024Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Erik Norvell, Volodya Grancharov
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Patent number: 12159634Abstract: An improved gain-shape vector quantization is achieved by determining a number of bits to be allocated to a gain adjustment- and shape-quantizer for a plurality of combinations of a current bit rate and a first signal property. The bit allocation is derived by using an average of optimal bit allocations for a training data set. A number of bits to the gain adjustment and the shape quantizers for a plurality of combinations of the bit rate and a first signal are pre-calculated, and a table indicating the number of bits to be allocated to the gain adjustment- and the shape-quantizers for a plurality of combinations of the bit rate and a first signal property is created. In this way, the table can be used for achieving an improved bit allocation.Type: GrantFiled: August 3, 2020Date of Patent: December 3, 2024Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventor: Erik Norvell
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Publication number: 20240347066Abstract: A method, system, and computer program to encode and decode a channel coherence parameter applied on a frequency band basis, where the coherence parameters of each frequency band form a coherence vector. The coherence vector is encoded and decoded using a predictive scheme followed by a variable bit rate entropy coding.Type: ApplicationFiled: April 23, 2024Publication date: October 17, 2024Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Erik NORVELL, Fredrik JANSSON
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Publication number: 20240296853Abstract: A method in an encoder to determine which of two encoding modes or groups of encoding modes to use is provided. The method includes deriving a frequency spectrum of an input audio signal. The method includes obtaining a magnitude of a critical frequency region of the frequency spectrum. The method includes obtaining a peakyness measure of the frame. The method includes obtaining a noise band detection measure. The method includes determining which one of the two encoding modes or groups of encoding modes to use based on at least the peakyness measure and the noise band detection measure. The method includes encoding the input audio signal based on the encoding mode determined to use.Type: ApplicationFiled: June 29, 2021Publication date: September 5, 2024Inventors: Charles KINUTHIA, Erik NORVELL
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Publication number: 20240282319Abstract: A method and apparatus to identify coincident microphone configurations, CC, and adapt an inter-channel time difference, ITD, search, in an encoder or a decoder is provided. The method includes for each frame m of a multi-channel audio signal: generating a cross-correlation of a channel pair of the multi-channel audio signal; determining a first ITD estimate based on the cross-correlation; determining if the multi-channel audio signal is a CC signal; and responsive to determining that the multi-channel audio signal is a CC signal, biasing the ITD search to favor ITDs close to zero to obtain a final ITD.Type: ApplicationFiled: June 15, 2021Publication date: August 22, 2024Inventors: Erik NORVELL, Tomas Jansson TOFTGÅRD
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Publication number: 20240274135Abstract: A method of approximating a lost or corrupted multichannel audio frame of a multichannel audio signal in a decoding device is provided. The device may generate a down-mix error concealment frame and transform the frame into a frequency domain to generate a transformed down-mix error concealment frame. The device may decorrelate the transformed frame to generate a decorrelated concealment frame. The device may obtain a residual signal spectrum of a stored residual signal of a previously received multichannel audio signal frame and generate an energy adjusted decorrelated residual signal concealment frame using the residual signal spectrum. The device may obtain a set of multi-channel audio substitution parameters and provide the frames and substitution parameters to an audio synthesis component to generate a synthesized multichannel audio frame. The device performs an inverse frequency domain transformation of the audio frame to generate a substitution frame for the lost or corrupted audio frame.Type: ApplicationFiled: April 17, 2024Publication date: August 15, 2024Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Erik NORVELL, Chamran MORADI ASHOUR
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Publication number: 20240221760Abstract: A method and a decoder device of generating a concealment audio subframe of an audio signal are provided. The method comprises generating frequency spectra on a subframe basis where consecutive subframes of the audio signal have a property that an applied window shape of first subframe of the consecutive subframes is a mirrored version or a time reversed version of a second subframe of the consecutive subframes. Peaks of a signal spectrum of a previously received audio signal are detected for a concealment subframe, and a phase of each of the peaks is estimated. A time reversed phase adjustment is derived based on the estimated phase and applied to the peaks of the signal spectrum to form time reversed phase adjusted peaks.Type: ApplicationFiled: March 18, 2024Publication date: July 4, 2024Inventors: Erik NORVELL, Chamran MORADI ASHOUR
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Publication number: 20240177719Abstract: A method for increasing stability of an inter-channel time difference (ICTD) parameter in parametric audio coding, wherein a multi-channel audio input signal comprising at least two channels is received. The method comprises obtaining an ICTD estimate, ICT Dest(m), for an audio frame m and a stability estimate of said ICTD estimate, and determining whether the obtained ICTD estimate, ICT Dest(m), is valid. If the ICTDest(m) is not found valid, and a determined sufficient number of valid ICTD estimates have been found in preceding frames, a hang-over time is determined using the stability estimate and a previously obtained valid ICTD parameter, ICTD(m?1), is selected as an output parameter, ICTD(m), during the hang-over time. The output parameter, ICTD(m), is set to zero if valid ICT Dest(m) is not found during the hang-over time.Type: ApplicationFiled: December 4, 2023Publication date: May 30, 2024Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Erik NORVELL, Tomas JANSSON TOFTGÅRD
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Patent number: 11990141Abstract: A method of approximating a lost or corrupted multichannel audio frame of a multichannel audio signal in a decoding device is provided. The device may generate a down-mix error concealment frame and transform the frame into a frequency domain to generate a transformed down-mix error concealment frame. The device may decorrelate the transformed frame to generate a decorrelated concealment frame. The device may obtain a residual signal spectrum of a stored residual signal of a previously received multichannel audio signal frame and generate an energy adjusted decorrelated residual signal concealment frame using the residual signal spectrum. The device may obtain a set of multi-channel audio substitution parameters and provide the frames and substitution parameters to an audio synthesis component to generate a synthesized multichannel audio frame. The device performs an inverse frequency domain transformation of the audio frame to generate a substitution frame for the lost or corrupted audio frame.Type: GrantFiled: May 16, 2019Date of Patent: May 21, 2024Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Erik Norvell, Chamran Moradi Ashour
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Publication number: 20240161758Abstract: A method for generation of comfort noise for at least two audio channels. The method comprises determining a spatial coherence between audio signals on the respective audio channels, wherein at least one spatial coherence value per frame and frequency band is determined to form a vector of spatial coherence values. A vector of predicted spatial coherence values is formed by a weighted combination of a first coherence prediction and a second coherence prediction that are combined using a weight factor ?. The method comprises signaling information about the weight factor ? to the receiving node, for enabling the generation of the comfort noise for the at least two audio channels at the receiving node.Type: ApplicationFiled: November 21, 2023Publication date: May 16, 2024Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Erik NORVELL, Fredrik JANSSON
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Patent number: 11978460Abstract: A method, system, and computer program to encode and decode a channel coherence parameter applied on a frequency band basis, where the coherence parameters of each frequency band form a coherence vector. The coherence vector is encoded and decoded using a predictive scheme followed by a variable bit rate entropy coding.Type: GrantFiled: August 3, 2022Date of Patent: May 7, 2024Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Erik Norvell, Fredrik Jansson
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Patent number: 11967327Abstract: A method and a decoder device of generating a concealment audio subframe of an audio signal are provided. The method comprises generating frequency spectra on a subframe basis where consecutive subframes of the audio signal have a property that an applied window shape of first subframe of the consecutive subframes is a mirrored version or a time reversed version of a second subframe of the consecutive subframes. Peaks of a signal spectrum of a previously received audio signal are detected for a concealment subframe, and a phase of each of the peaks is estimated. A time reversed phase adjustment is derived based on the estimated phase and applied to the peaks of the signal spectrum to form time reversed phase adjusted peaks.Type: GrantFiled: June 4, 2020Date of Patent: April 23, 2024Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Erik Norvell, Chamran Moradi Ashour
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Publication number: 20240055008Abstract: A method and a transmitting node for supporting generation of comfort noise for at least two audio channels at a receiving node. The method is performed by a transmitting node. The method comprises determining spectral characteristics of audio signals on at least two input audio channels and determining a spatial coherence between the audio signals. The spatial coherence is associated with perceptual importance measures. A compressed representation of the spatial coherence is determined per frequency band by weighting the spatial coherence within each frequency band according to the perceptual importance measures. Information about the spectral characteristics and the compressed representation of the spatial coherence per frequency band is signaled to the receiving node for enabling the generation of the comfort noise at the receiving node.Type: ApplicationFiled: October 26, 2023Publication date: February 15, 2024Inventors: Fredrik Jansson, Erik Norvell, Tomas Jansson Toftgård
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Patent number: 11869518Abstract: A method for increasing stability of an inter-channel time difference (ICTD) parameter in parametric audio coding, wherein a multi-channel audio input signal comprising at least two channels is received. The method comprises obtaining an ICTD estimate, ICTDest(m), for an audio frame m and a stability estimate of said ICTD estimate, and determining whether the obtained ICTD estimate, ICTDest(m), is valid. If the ICTDest(m) is not found valid, and a determined sufficient number of valid ICTD estimates have been found in preceding frames, a hang-over time is determined using the stability estimate and a previously obtained valid ICTD parameter, ICTD(m?1), is selected as an output parameter, ICTD(m), during the hang-over time. The output parameter, ICTD(m), is set to zero if valid ICTDest(m) is not found during the hang-over time.Type: GrantFiled: June 16, 2022Date of Patent: January 9, 2024Assignee: TELEFONAKTIEBOLAGET LM ERICSSONInventors: Erik Norvell, Tomas Jansson Toftgård
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Patent number: 11862181Abstract: A method for generation of comfort noise for at least two audio channels. The method comprises determining a spatial coherence between audio signals on the respective audio channels, wherein at least one spatial coherence value per frame and frequency band is determined to form a vector of spatial coherence values. A vector of predicted spatial coherence values is formed by a weighted combination of a first coherence prediction and a second coherence prediction that are combined using a weight factor ?. The method comprises signaling information about the weight factor ? to the receiving node, for enabling the generation of the comfort noise for the at least two audio channels at the receiving node.Type: GrantFiled: November 3, 2022Date of Patent: January 2, 2024Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Erik Norvell, Fredrik Jansson
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Publication number: 20230402043Abstract: A method and a decoder for generating concealment audio frame of an audio signal. The method includes performing a frequency domain analysis of a sequence of previously decoded audio signal to obtain a frequency spectrum and identifying peaks in the spectrum. The method further includes estimating a relative energy between the noise spectrum and the complete spectrum, determining an attenuation of the noise spectrum based on the relative energy, and applying the attenuation to the noise spectrum. The method includes applying an inverse transform to time domain on an error concealment spectrum, that includes the peaks and the attenuated noise spectrum.Type: ApplicationFiled: November 24, 2021Publication date: December 14, 2023Inventors: Chamran MORADI ASHOUR, Erik NORVELL, Martin SEHLSTEDT
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Patent number: 11837242Abstract: A method and a transmitting node for supporting generation of comfort noise for at least two audio channels at a receiving node. The method is performed by a transmitting node. The method comprises determining spectral characteristics of audio signals on at least two input audio channels and determining a spatial coherence between the audio signals. The spatial coherence is associated with perceptual importance measures. A compressed representation of the spatial coherence is determined per frequency band by weighting the spatial coherence within each frequency band according to the perceptual importance measures. Information about the spectral characteristics and the compressed representation of the spatial coherence per frequency band is signaled to the receiving node for enabling the generation of the comfort noise at the receiving node.Type: GrantFiled: June 21, 2022Date of Patent: December 5, 2023Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Fredrik Jansson, Erik Norvell, Tomas Jansson Toftgård
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Publication number: 20230230603Abstract: A method of operating an encoder or a decoder. The method comprises receiving an analysis signal of an audio signal and a filtered analysis signal, combining the filtered signal with the analysis signal to generate a combined signal using a maximum function that provides at least one of a maximum positive value at each index i of the combined signal and a maximum negative value at each index i of the combined signal. The method comprises identifying broad peaks and narrow peaks of the combined signal.Type: ApplicationFiled: June 23, 2021Publication date: July 20, 2023Inventor: Erik Norvell
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Publication number: 20230154479Abstract: A method and a decoder for audio decoding, where an encoded primary signal is decoded to form a decoded primary signal, followed by a post-filtering of the decoded primary signal to form a post-filtered signal, where an output signal of the decoder is one of the decoded primary signal and the post-filtered signal. An energy estimation of at least a part of a frequency spectrum of the primary signal being reconstructed by the decoder and an analysis of discontinuities in time domain that is caused by the post-filtering of the decoded primary signal are obtained. A decision variable is generated based on the energy estimation and the analysis of discontinuities obtained. The decision variable is compared to a threshold and the output signal is set to be the decoded primary signal or the post-filtered signal based on the comparing of the decision variable to the threshold.Type: ApplicationFiled: April 23, 2021Publication date: May 18, 2023Inventors: Chamran MORADI ASHOUR, Erik Norvell