Dolby Laboratories Licensing Corporation

Dolby International Ab

Rhonda J Wilson

David Matthew Cooper

Dirk Jeroen Breebaart

Alan Jeffrey Seefeldt

C Phillip Brown

Nicolas R Tsingos

Remi Samuel Audfray

Sunil Bharitkar

Grant Allen Davidson

Zhiwei Shuang

Kuan-Chieh Yen

David S McGrath

Mark Franklin Davis

Joshua Brandon Lando

Heiko Purnhagen

Brett Graham Crockett

Leif Jonas Samuelsson

Jeroen Koppens

Alexander Stahlmann

Kristofer Kjoerling

Ming Wang

Lie Lu

Harald Mundt

Regunathan Radhakrishnan

Michael C Ward

Michael D Ward

Claus Bauer

Mingqing Hu

Poppy Crum

Mark F Davis

David S Mcgrath

Louis Dunn Fielder

Christophe Chabanne

Vinay Melkote

Giulio Cengarle

Matthew Conrad Fellers

Lianwu Chen

Malcolm James Law

Poppy Anne Carrie Crum

Roger Wallace Dressler

Spencer Hooks

Alex Brandmeyer

McGregor Steele Joyner

Andrea Fanelli

Steven Joseph Venezia

David Mcgrath

Andy Jaspar

Mark Tuffy

Douglas Walter Hansen

Simon Plain

Steven Venezia

Phillip C Brown

Mcgregor Steele Joyner

Malcolm J Law

A system and method of modifying a binaural signal using headtracking information. The system calculates a delay, a first filter response, and a second filter response, and applies these to the left and right components of the binaural signal according to the headtracking information. The system may also apply headtracking to parametric binaural signals. In this manner, headtracking may be applied to pre-rendered binaural audio.

Headtracking for pre-rendered binaural audio

Encoding/decoding techniques where multiple transform parameter sets are encoded together with a rendered playback presentation of an input audio content. The multiple transform parameters are used on the decoder side to transform the playback presentation to provide a personalized binaural playback presentation optimized for an individual listener with respect to their hearing profile. This may be achieved by selection or combination of the data present in the metadata streams.

Audio encoding/decoding with transform parameters

A method for encoding an input audio stream including the steps of obtaining a first playback stream presentation of the input audio stream intended for reproduction on a first audio reproduction system, obtaining a second playback stream presentation of the input audio stream intended for reproduction on a second audio reproduction system, determining a set of transform parameters suitable for transforming an intermediate playback stream presentation to an approximation of the second playback stream presentation, wherein the transform parameters are determined by minimization of a measure of a difference between the approximation of the second playback stream presentation and the second playback stream presentation, and encoding the first playback stream presentation and the set of transform parameters for transmission to a decoder.

Audio encoding and decoding using presentation transform parameters

In some embodiments, virtualization methods for generating a binaural signal in response to channels of a multi-channel audio signal, which apply a binaural room impulse response (BRIR) to each channel including by using at least one feedback delay network (FDN) to apply a common late reverberation to a downmix of the channels. In some embodiments, input signal channels are processed in a first processing path to apply to each channel a direct response and early reflection portion of a single-channel BRIR for the channel, and the downmix of the channels is processed in a second processing path including at least one FDN which applies the common late reverberation. Typically, the common late reverberation emulates collective macro attributes of late reverberation portions of at least some of the single-channel BRIRs. Other aspects are headphone virtualizers configured to perform any embodiment of the method.

Generating binaural audio in response to multi-channel audio using at least one feedback delay network

A method for generating mastered audio content, the method comprising obtaining an input audio content comprising a number, M, of audio signals, obtaining rendered presentation of the input audio content, the rendered presentation comprising a number, M, of audio signals, obtaining a mastered presentation generated by mastering the rendered presentation, comparing the mastered presentation with the rendered presentation to determine one or more indications of differences between the mastered presentation and the rendered presentation, modifying one or more of the audio signals of the input audio content based on the indications of differences to generate the mastered audio content. With this approach, conventional, typically stereo, channel-based mastering tools can be used to provide a mastered version of any input audio content, including object-based immersive audio content.

Presentation independent mastering of audio content

Embodiments are described for a method of rendering audio for playback through headphones comprising receiving digital audio content, receiving binaural rendering metadata generated by an authoring tool processing the received digital audio content, receiving playback metadata generated by a playback device, and combining the binaural rendering metadata and playback metadata to optimize playback of the digital audio content through the headphones.

Binaural rendering for headphones using metadata processing

A method for creating an output soundfield signal from an input soundfield signal, the method including the steps of: (a) forming at least one delayed signals from the input soundfield signal, (b) for each of the delayed signals, creating an acoustically transformed delayed signal, by an acoustic transformation process, and (c) combining together the acoustically transformed delayed signals and the input soundfield signal to produce the output soundfield signal.

System and method for spatial processing of soundfield signals

A method of calibrating a feedback-based noise cancellation system of an ear device may involve obtaining a measured plant response of the ear device, obtaining a reference plant response value and determining a plant response variation between the reference plant response value and a value corresponding to the measured plant response. The method may involve obtaining a measured a coupler response of the ear device, obtaining a reference coupler response value and determining a coupler response variation between the reference coupler response value and a value corresponding to the measured coupler response. The method may involve determining, based at least in part on the plant response variation and the coupler response variation, a microphone signal gain correction factor and applying the microphone signal gain correction factor to ear device microphone signals that are input to a feedback loop of the feedback-based noise cancellation system.

Auto calibration of an active noise control system

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San Francisco, CA, United States of America

Rhonda J Wilson