Volcker
Bjorn Volcker, Bromma SE
Patent application number | Description | Published |
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20120281914 | DETECTION AND SUPPRESSION OF FLICKER IN A SEQUENCE OF IMAGES - The invention relates to a method, device and computer-program product for detection of undesired temporal variations (flicker) in a sequence of video frames. In one embodiment, frame-wise luminance means are compared with a reference level and the crossing frequency is compared with expected variation frequencies, such as frequencies associated with an illumination frequency through aliasing. The crossings count can be refined by introducing a latency zone around the reference level. In case of a positive detection of an undesired temporal variation, there is further provided a correction method, device and computer-program product using cumulated distribution functions. The visual detriment of flicker-induced saturation of pixels is alleviated either by brightening non-saturated pixels or by replacing the saturated pixels by randomly sampled values in accordance with a reference cumulated distribution function. The invention provides embodiments suitable for real-time processing of streamed video sequences. | 11-08-2012 |
20130163698 | LOW COMPLEX AND ROBUST DELAY ESTIMATION - A method and apparatus for finding an estimate of the delay of a signal travelling between two points. A quantity is evaluated from the signal at a final number of time instants, at both a reference point and a reception point. The values are quantized by comparison with a threshold adapted to a typical magnitude of the quantity. If the quantized values from the reception point are shifted back by the true delay with respect to the quantized values from the reference point, then certain co-occurrences of quantized values have very low probability. Hence, the best delay estimate is that shift which yields the least number of low-probability co-occurrences. | 06-27-2013 |
Bjorn Volcker, Mountain View, CA US
Patent application number | Description | Published |
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20150199953 | NON-LINEAR POST-PROCESSING CONTROL IN STEREO AEC - Methods, systems, and apparatus are provided for multiple-input multiple-output acoustic echo cancellation. A multiple-input multiple-output acoustic echo canceller (MIMO AEC) is provided as a high quality echo canceller for voice and/or audio communication over a network (e.g., packet switched network). The MIMO AEC is an extension of, as well as an application/usage of a single-input single-output acoustic echo canceller (“mono AEC”). The MIMO AEC is an extension of the mono AEC in that the code/theory underlying the mono AEC is adjusted for use with multiple channels. The manner in which AEC is applied (e.g., on each microphone signal using separate mono-AECs) is an application of mono-AECs. | 07-16-2015 |
20150201087 | PARTICIPANT CONTROLLED SPATIAL AEC - Methods and systems are provided for speaker separated spatial acoustic echo cancellation (AEC). A new approach is provided to combat the non-identifiability issue in multiple loudspeaker arrangements with shared echo cancellation processing. By associating echo channels with actual speakers (e.g., participants, talkers, users, individuals, etc.) rather than loudspeakers, the methods and techniques provided allow for continued use of mono AEC. Also provided is a straightforward speaker detection scheme for identifying different speakers in a stereo loudspeaker environment. | 07-16-2015 |
Björn Volcker, Bromma SE
Patent application number | Description | Published |
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20120294452 | METHOD AND APPARATUS FOR REDUCING NOISE PUMPING DUE TO NOISE SUPPRESSION AND ECHO CONTROL INTERACTION - An input signal is processed through noise suppression (NS) and echo control (EC) via a multipath model that reduces noise pumping effects while maintaining EC performance. A copy of a “noisy” input signal is sent to an EC component before the noisy signal is sent to a NS component, which processes the signal first, when there is a consistent noise level for estimation. The copy of the pre-processing noisy signal is sent to the EC component along with a “clean” or “noise-suppressed” signal output from the NS component. The EC component analyzes the noisy signal as if the EC was the first component in the signal chain to determine what actions to take. The EC component then applies these actions to the clean signal received from the NS component. | 11-22-2012 |
20120294453 | METHOD AND APPARATUS FOR REDUCING NOISE PUMPING DUE TO NOISE SUPPRESSION AND ECHO CONTROL INTERACTION - An input signal is processed through noise suppression (NS) and echo control (EC) via a multipath model that reduces noise pumping effects while maintaining EC performance. A copy of a “noisy” input signal is sent to an EC component before the noisy signal is sent to a NS component, which processes the signal first, when there is a consistent noise level for estimation. The copy of the pre-processing noisy signal is sent to the EC component along with a “clean” or “noise-suppressed” signal output from the NS component. The EC component analyzes the noisy signal as if the EC was the first component in the signal chain to determine what actions to take. The EC component then applies these actions to the clean signal received from the NS component. | 11-22-2012 |
20120296657 | METHOD AND APPARATUS FOR MULTI-CHANNEL AUDIO PROCESSING USING SINGLE-CHANNEL COMPONENTS - Processing multi-channel audio streams using one or more arrangements of single-channel components. Components that only process the near-end, or capture stream, such as noise suppression (NS) components, are limited in how they can be suitably arranged for processing multi-channel streams. However, components that process the near-end stream using one or more inputs from the far-end, or render stream, such as acoustic echo cancellation (AEC) and automatic gain control (AGC) components, are arranged in one or more of the ways suitable for use with multiple channels. | 11-22-2012 |
20130163698 | LOW COMPLEX AND ROBUST DELAY ESTIMATION - A method and apparatus for finding an estimate of the delay of a signal travelling between two points. A quantity is evaluated from the signal at a final number of time instants, at both a reference point and a reception point. The values are quantized by comparison with a threshold adapted to a typical magnitude of the quantity. If the quantized values from the reception point are shifted back by the true delay with respect to the quantized values from the reference point, then certain co-occurrences of quantized values have very low probability. Hence, the best delay estimate is that shift which yields the least number of low-probability co-occurrences. | 06-27-2013 |