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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Patent number: 10276174Abstract: 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: April 30, 2019Assignee: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Publication number: 20190122675Abstract: 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: December 17, 2018Publication date: April 25, 2019Applicant: DOLBY INTERNATIONAL ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Patent number: 10038898Abstract: Method, device and computer program product for estimating quality of a video signal, wherein frames of the video signal are received at receiving means of the device, each frame comprising a plurality of blocks of pixels. A section of a first frame of the video signal, which is correctly received, is used to provide a concealed block for use in place of a block of a second frame of the video signal. A difference measure is determined indicative of a difference between at least some of the pixels surrounding the block in the second frame and the corresponding pixels surrounding the section in the first frame. The difference measure is used to estimate the quality of the second frame of the video signal.Type: GrantFiled: December 4, 2015Date of Patent: July 31, 2018Assignee: Microsoft Technology Licensing, LLCInventors: Pontus Carlsson, Andrei Jefremov, Sergey Silkin, David Zhao
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Publication number: 20180144751Abstract: 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: January 17, 2018Publication date: May 24, 2018Applicant: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Kristofer Kjoerling
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Publication number: 20180137867Abstract: 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: December 20, 2017Publication date: May 17, 2018Applicant: DOLBY INTERNATIONAL ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Publication number: 20180137868Abstract: 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: December 20, 2017Publication date: May 17, 2018Applicant: DOLBY INTERNATIONAL ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Publication number: 20180137866Abstract: 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: December 20, 2017Publication date: May 17, 2018Applicant: DOLBY INTERNATIONAL ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Patent number: 9905230Abstract: 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: June 9, 2015Date of Patent: February 27, 2018Assignee: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Kristofer Kjoerling
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Patent number: 9892736Abstract: 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: July 7, 2015Date of Patent: February 13, 2018Assignee: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Publication number: 20170365261Abstract: 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: August 7, 2017Publication date: December 21, 2017Applicant: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Patent number: 9761233Abstract: 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 method comprises applying independent band-width limits for the input channels.Type: GrantFiled: June 1, 2016Date of Patent: September 12, 2017Assignee: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Patent number: 9762799Abstract: Method, device and computer program product for stabilizing a received video signal. A plurality of frames of the video signal is captured using a camera. The video signal is transmitted as an encoded bit stream. Displacement of the camera between successive frames is determined from a motion indication in the bit stream. The determined displacement is used to compensate for motion in the video signal between successive frames caused by the motion of the camera, to thereby stabilize the video signal.Type: GrantFiled: December 29, 2011Date of Patent: September 12, 2017Assignee: SkypeInventors: Pontus Carlsson, Andrei Jefremov, Sergey Sablin, David Zhao
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Patent number: 9635256Abstract: Method, device and computer program product for transmitting a video signal from a user device includes capturing a plurality of frames of the video signal using a camera at the user device, determining a functional state of the device and selectively stabilizing the video signal prior to transmission based on the functional state.Type: GrantFiled: March 31, 2014Date of Patent: April 25, 2017Assignee: SkypeInventors: Christopher Owen, Pontus Carlsson
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Patent number: 9609321Abstract: A receiving apparatus comprises a receiver for receiving a video signal, an output for outputting the video signal to a screen, storage device or further terminal; and a concealment module for applying a concealment algorithm to a lost area of the video signal. The concealment module is configured to determine an estimate of concealment quality selectively directed toward a region of interest within the area in question, and based on this estimate to determine whether or not to apply the concealment algorithm.Type: GrantFiled: March 14, 2013Date of Patent: March 28, 2017Assignee: Microsoft Technology Licensing, LLCInventors: David Yuheng Zhao, Sergei Nikiforov, Konrad Hofbauer, Magnus Hemmendorff, Pontus Carlsson
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Publication number: 20170070738Abstract: 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: ApplicationFiled: September 8, 2015Publication date: March 9, 2017Inventors: 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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Publication number: 20170070739Abstract: 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: ApplicationFiled: September 8, 2015Publication date: March 9, 2017Inventors: 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: 9516325Abstract: An encoder comprising an encoding module and an adaptation module. The encoding module is configured to encode video in at least one region-of-interest and outside the region-of-interest. The encoding comprises quantization, and the encoding module is operable to apply a difference in quantization granularity between the encoding inside and outside the region-of-interest. The adaptation module is configured to determine at least one metric representative of a difference in benefit of the quantization inside and outside the region-of-interest, and to adapt the difference in quantization granularity in dependence on this metric.Type: GrantFiled: October 20, 2015Date of Patent: December 6, 2016Assignee: Microsoft Technology Licensing, LLCInventors: Pontus Carlsson, Magnus Hemmendorff, Konrad Hofbauer, Sergei Nikiforov, David Zhao
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Publication number: 20160329057Abstract: 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 so of the second input channel and a complex prediction coefficient. The method comprises applying independent band-width limits for the input channels.Type: ApplicationFiled: June 1, 2016Publication date: November 10, 2016Applicant: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Patent number: 9378745Abstract: 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 method comprises applying independent bandwidth limits for the input channels.Type: GrantFiled: April 6, 2011Date of Patent: June 28, 2016Assignee: Dolby International ABInventors: Heiko Purnhagen, Pontus Carlsson, Lars Villemoes
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Patent number: 9338473Abstract: A method of performing a rate-distortion optimization process comprising, for each of a plurality of target image portions to be encoded in each of a plurality of frames, selecting a preferred one of a set of encoding modes by optimizing a function comprising an estimate of distortion for the target image portion and a measure of bit rate required to encode the target image portion, wherein the estimate of distortion is based on source coding distortion and an estimate of a distortion that would be experienced due to possible loss over the channel; encoding the target image portion into the encoded video stream using the selected encoding mode; and transmitting the encoded video stream over the channel. The rate-distortion optimization process for a current one of the frames is performed in dependence on feedback received from the receiving terminal based on an earlier one of the frames.Type: GrantFiled: October 17, 2011Date of Patent: May 10, 2016Assignee: SkypeInventors: David Zhao, Mattias Nilsson, Renat Vafin, Andrei Jefremov, Sören Vang Andersen, Pontus Carlsson