Patents by Inventor Pontus Carlsson
Pontus Carlsson 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: 20200035251Abstract: The invention provides methods and devices for outputting a stereo audio signal having a left channel and a right channel. The apparatus includes a demultiplexer, decoder, and upmixer. The upmixer is configured operate either in a prediction mode or a non-prediction mode based on a parameter encoded in the audio bitstream.Type: ApplicationFiled: October 4, 2019Publication date: January 30, 2020Applicant: DOLBY INTERNATIONAL ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Publication number: 20190392844Abstract: Methods and systems encoding a stereo audio signal having a left channel and a right channel are disclosed. The system includes a downmixer for generating a downmix signal and a residual signal from the stereo audio signal in selected frequency bands representing only part of a used audio frequency range of the stereo audio signal, and a decision module for selecting, in a time variant manner, either left/right perceptual encoding or mid/side perceptual encoding. The system also includes a parameter estimator for estimating stereo parameters for reconstructing a stereo image of a portion of the stereo audio signal, and a perceptual encoder for performing either left/right perceptual encoding or mid/side perceptual encoding based on the selecting to generate an encoded output signal. Finally, the system includes a bitstream generator for creating a bitstream signal comprising the encoded output signal.Type: ApplicationFiled: September 3, 2019Publication date: December 26, 2019Applicant: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Kristofer Kjoerling
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Publication number: 20190378521Abstract: Methods and systems encoding a stereo audio signal having a left channel and a right channel are disclosed. The system includes a downmixer for generating a downmix signal and a residual signal from the stereo audio signal in selected frequency bands representing only part of a used audio frequency range of the stereo audio signal, and a decision module for selecting, in a time variant manner, either left/right perceptual encoding or mid/side perceptual encoding. The system also includes a parameter estimator for estimating stereo parameters for reconstructing a stereo image of a portion of the stereo audio signal, and a perceptual encoder for performing either left/right perceptual encoding or mid/side perceptual encoding based on the selecting to generate an encoded output signal. Finally, the system includes a bitstream generator for creating a bitstream signal comprising the encoded output signal.Type: ApplicationFiled: August 20, 2019Publication date: December 12, 2019Applicant: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Kristofer Kjoerling
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Publication number: 20190364210Abstract: Method, device and computer program product for stabilizing a video signal. In one embodiment, a plurality of frames of a video signal are captured using a camera. A first motion of the camera is determined, with the first motion exclusive of second motion occurring while the shutter is open. Pixel displacement between first and second frames of the video signal is determined based on the determined first motion. An image of at least one of the first and second frames is shifted in accordance with the pixel displacement.Type: ApplicationFiled: August 12, 2019Publication date: November 28, 2019Inventors: Andrei Jefremov, David Yubeng Zhao, Pontus Carlsson
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Patent number: 10475459Abstract: The invention provides methods and devices for outputting a stereo audio signal having a left channel and a right channel. The apparatus includes a demultiplexer, decoder, and upmixer. The upmixer is configured operate either in a prediction mode or a non-prediction mode based on a parameter encoded in the audio bitstream.Type: GrantFiled: May 31, 2019Date of Patent: November 12, 2019Assignee: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Patent number: 10475460Abstract: The invention provides methods and apparatuses for encoding a stereo audio signal having a left channel and a right channel. The apparatus includes a prediction coefficient estimator, downmixer, and multiplexer. The downmixer is configured operate either in a prediction mode or a non-prediction mode.Type: GrantFiled: June 4, 2019Date of Patent: November 12, 2019Assignee: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Publication number: 20190318748Abstract: Methods and systems encoding a stereo audio signal having an original left channel and an original right channel are disclosed. The method includes generating a downmix signal and a residual signal based on the stereo audio signal and determining one or more stereo parameters based on the stereo audio signal. The residual signal covers only a part of an audio frequency range of the stereo signal, and the one or more stereo parameters describing a stereo image of the stereo audio signal. The method further includes analyzing the stereo audio signal and selecting, based on the analyzing, left/right perceptual encoding or mid/side perceptual encoding in a time variant manner.Type: ApplicationFiled: June 28, 2019Publication date: October 17, 2019Applicant: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Kristofer Kjoerling
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Publication number: 20190311725Abstract: The invention provides methods and apparatuses for encoding a stereo audio signal having a left channel and a right channel. The apparatus includes a prediction coefficient estimator, downmixer, and multiplexer. The encoder is configured operate either in a prediction mode or a non-prediction mode.Type: ApplicationFiled: June 24, 2019Publication date: October 10, 2019Applicant: DOLBY INTERNATIONAL ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Publication number: 20190287538Abstract: Methods and systems for advanced stereo processing of an audio signal are disclosed. The methods and systems include selecting a coding mode of either transform coding or linear predictive coding and performing advanced stereo processing when in the selected coding mode. Both encoding and decoding operations are provided.Type: ApplicationFiled: June 6, 2019Publication date: September 19, 2019Applicant: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Kristofer Kjoerling
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Publication number: 20190287539Abstract: The invention provides methods and devices for outputting a stereo audio signal having a left channel and a right channel. The apparatus includes a demultiplexer, decoder, and upmixer. The upmixer is configured operate either in a prediction mode or a non-prediction mode based on a parameter encoded in the audio bitstream.Type: ApplicationFiled: May 31, 2019Publication date: September 19, 2019Applicant: DOLBY INTERNATIONAL ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Publication number: 20190287541Abstract: The invention provides methods and apparatuses for encoding a stereo audio signal having a left channel and a right channel. The apparatus includes a prediction coefficient estimator, downmixer, and multiplexer. The downmixer is configured operate either in a prediction mode or a non-prediction mode.Type: ApplicationFiled: June 4, 2019Publication date: September 19, 2019Applicant: DOLBY INTERNATIONAL ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Publication number: 20190279648Abstract: The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.Type: ApplicationFiled: May 28, 2019Publication date: September 12, 2019Applicant: Dolby International ABInventors: Heiko Purnhagen, Lars Villemoes, Pontus Carlsson
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Patent number: 10412305Abstract: Method, device and computer program product for stabilizing a video signal. A plurality of frames of the video signal are captured using a camera. A motion sensor associated with the camera is used to generate a plurality of samples representing motion of the camera. The samples are used to determine a displacement of the camera between a first time and a second time, wherein the first time corresponds to an exposure time midpoint of a first frame of the video signal and the second time corresponds to an exposure time midpoint of a second frame of the video signal. The determined displacement is used to compensate for motion in the video signal between the first and second frames caused by the motion of the camera, to thereby stabilize the video signal.Type: GrantFiled: April 1, 2014Date of Patent: September 10, 2019Assignee: SKYPEInventors: Andrei Jefremov, David Yuheng Zhao, Pontus Carlsson
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Publication number: 20190228782Abstract: The application relates to audio encoder and decoder systems. An embodiment of the encoder system comprises a downmix stage for generating a downmix signal and a residual signal based on a stereo signal. In addition, the encoder system comprises a parameter determining stage for determining parametric stereo parameters such as an inter-channel intensity difference and an inter-channel cross-correlation. Preferably, the parametric stereo parameters are time- and frequency-variant. Moreover, the encoder system comprises a transform stage. The transform stage generates a pseudo left/right stereo signal by performing a transform based on the downmix signal and the residual signal. The pseudo stereo signal is processed by a perceptual stereo encoder. For stereo encoding, left/right encoding or mid/side encoding is selectable. Preferably, the selection between left/right stereo encoding and mid/side stereo encoding is time- and frequency-variant.Type: ApplicationFiled: March 29, 2019Publication date: July 25, 2019Applicant: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Kristofer Kjoerling
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Patent number: 10360920Abstract: The invention provides methods and devices for outputting a stereo audio signal having a left channel and a right channel. The apparatus includes a demultiplexer, decoder, and upmixer. The upmixer is configured operate either in a prediction mode or a non-prediction mode based on a parameter encoded in the audio bitstream.Type: GrantFiled: December 17, 2018Date of Patent: July 23, 2019Assignee: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Patent number: 10347260Abstract: The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.Type: GrantFiled: August 7, 2017Date of Patent: July 9, 2019Assignee: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Patent number: 10313685Abstract: A transmitting device for generating a plurality of encoded portions of a video to be transmitted to a receiving device over a network configured to: receive an error message over a feedback channel from the receiving device indicating at least one of said plurality of encoded portions that has been lost at the receiving device; encode a recovery portion responsive to said receiving said error message; and transmit said recovery portion to the receiving device over said network; wherein said error message includes information pertaining to a decoded portion successfully decoded at the receiving device and said recovery portion is encoded relative to said decoded portion.Type: GrantFiled: September 8, 2015Date of Patent: June 4, 2019Assignee: Microsoft Technology Licensing, LLCInventors: Ming-Chieh Lee, Amy Lu, Pontus Carlsson, Mattias Dan Nilsson, Sergey Sablin, Sergey Silkin, David Yuheng Zhao, Magnus Hemmendorff, Sergei Nikiforov
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Patent number: 10297259Abstract: The application relates to audio encoder and decoder systems. An embodiment of the encoder system comprises a downmix stage for generating a downmix signal and a residual signal based on a stereo signal. In addition, the encoder system comprises a parameter determining stage for determining parametric stereo parameters such as an inter-channel intensity difference and an inter-channel cross-correlation. Preferably, the parametric stereo parameters are time- and frequency-variant. Moreover, the encoder system comprises a transform stage. The transform stage generates a pseudo left/right stereo signal by performing a transform based on the downmix signal and the residual signal. The pseudo stereo signal is processed by a perceptual stereo encoder. For stereo encoding, left/right encoding or mid/side encoding is selectable. Preferably, the selection between left/right stereo encoding and mid/side stereo encoding is time- and frequency-variant.Type: GrantFiled: January 17, 2018Date of Patent: May 21, 2019Assignee: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Kristofer Kjoerling
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Patent number: 10283127Abstract: The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.Type: GrantFiled: December 20, 2017Date of Patent: May 7, 2019Assignee: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Patent number: 10283126Abstract: The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.Type: GrantFiled: December 20, 2017Date of Patent: May 7, 2019Assignee: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes