Dolby Laboratories Licensing Corporation

Dolby International Ab

Dobly International Ab

Alan Jeffrey Seefeldt

Brett Graham Crockett

C Phillip Brown

Joshua Brandon Lando

Lie Lu

Sripal S Mehta

Michael John Smithers

Rhonda J Wilson

Ming Wang

Vincent Voron

Daniel Arteaga

Kristofer Kjoerling

Nicolas R Tsingos

Peter Michaelian

Jeffrey Charles Riedmiller

Holger Hoerich

Jeroen Koppens

Dirk Jeroen Breebaart

Remi Samuel Audfray

Grayson H Byrd

Sunil Bharitkar

Cody Michael Proksa

Stewart Murrie

John Carson Stewart

Drew Alexander Walcott

Brian Edward Renz

Glenn N Dickins

Chen Zhang

Christophe Chabanne

Alexander Stahlmann

Mark R P Thomas

Spencer Hooks

Mark Stuart Vinton

David Gunawan

Lucas E Saule

Freddie Sanchez

Brad Basler

Christopher Graham Hines

Chunjian Li

Mark Franklin Davis

Richard James Cartwright

David Matthew Cooper

Alexander Groeschel

Mark A Alexander

Davide Scaini

Warren Mansfield

Antonio Mateos Sole

Giulio Cengarle

Kenneth James Gundry

Mingqing Hu

David Matthew Fischer

S Spencer Hooks

Charles Phillip Brown

Mark Tuffy

Peter Michael Razukas

Arun Sambandam

Per Ekstrand

Xin Peng Liu

Charles Quito Robinson

Grant Allen Davidson

Louis Dunn Fielder

Timothy Alan Port

Matthew Conrad Fellers

Lianwu Chen

Nicholas Luke Appleton

Aaron Steven Master

Vince Voron

Benjamin John Southwell

Brian David Link

Carlos Eduardo Medaglia Dyonisio

Avery Bruni

Olha Michelle Townsend

Jared Smith

Nicholas L Engel

Eugene Edward Radzik

Matthew Chang

Nicholas Laurence Engel

Mark Alexander

Mark Richard Paul Thomas

Carlos Medaglia Dyonisio

François G Germain

Yu Cecilia Hou

Patrick Turnmire

Mohammad N Ahmad

Bruce R Jackson

John D Couling

Richard J Cartwright

Phillip C Brown

Mark RP Thomas

Spencer S Hooks

Some methods involve receiving, by a control system configured for implementing a plurality of Tenderers, audio data and listening configuration data for a plurality of listening configurations, each listening configuration of the plurality of listening configurations corresponding to a listening position and a listening orientation in an audio environment, and rendering, by each Tenderer and according to the listening configuration data, the received audio data to obtain a set of Tenderer-specific loudspeaker feed signals for a corresponding listening configuration. Each Tenderer may be configured to render the audio data for a different listening configuration. Some such methods may involve decomposing each set of renderer-specific loudspeaker feed signals into a Tenderer-specific set of frequency bands and combining the renderer-specific frequency bands of each Tenderer to produce an output set of loudspeaker feed signals. Some such methods may involve outputting the output set of loudspeaker feed signals to a plurality of loudspeakers.

Frequency domain multiplexing of spatial audio for multiple listener sweet spots

Rendering audio signals may involve a mapping for each audio signal to the loudspeaker signals computed as a function of an audio signal's intended perceived spatial position, physical positions associated with the loudspeakers and a time- and frequency-varying representation of loudspeaker signal level relative to a maximum playback limit of each loudspeaker. Each mapping may be computed to approximately achieve the intended perceived spatial position of an associated audio signal when the loudspeaker signals are played back. A representation of loudspeaker signal level relative to a maximum playback limit may be computed for each audio signal. The mapping of an audio signal into a particular loudspeaker signal may be reduced as loudspeaker signal level relative to a maximum playback limit increases above a threshold, while the mapping may be increased into one or more other loudspeakers for which the maximum playback limits are less than a threshold.

Spatial audio rendering adaptive to signal level and loudspeaker playback limit thresholds

Some methods may involve receiving a first content stream that includes first audio signals, rendering the first audio signals to produce first audio playback signals, generating first calibration signals, generating first modified audio playback signals by inserting the first calibration signals into the first audio playback signals, and causing a loudspeaker system to play back the first modified audio playback signals, to generate first audio device playback sound. The method(s) may involve receiving microphone signals corresponding to at least the first audio device playback sound and to second through Nth audio device playback sound corresponding to second through Nth modified audio playback signals (including second through Nth calibration signals) played back by second through Nth audio devices, extracting second through Nth calibration signals from the microphone signals and estimating at least one acoustic scene metric based, at least partly, on the second through Nth calibration signals.

Pervasive acoustic mapping

An audio session management method for an audio environment having multiple audio devices may involve receiving, from a first device implementing a first application and by a device implementing an audio session manager, a first route initiation request to initiate a first route for a first audio session. The first route initiation request may indicate a first audio source and a first audio environment destination. The first audio environment destination may correspond with at least a first person in the audio environment, but in some instances will not indicate an audio device. The method may involve establishing a first route corresponding to the first route initiation request. Establishing the first route may involve determining a first location of at least the first person in the audio environment, determining at least one audio device for a first stage of the first audio session and initiating or scheduling the first audio session.

Coordination of audio devices

A method for estimating an audio device location in an environment may involve obtaining direction of arrival (DOA) data for each audio device of a plurality of audio devices in the environment and determining interior angles for each of a plurality of triangles based on the DOA data. Each triangle may have vertices that correspond with audio device locations. The method may involve determining a side length for each side of each of the triangles, performing a forward alignment process of aligning each of the plurality of triangles produce a forward alignment matrix and performing a reverse alignment process of aligning each of the plurality of triangles in a reverse sequence to produce a reverse alignment matrix. A final estimate of each audio device location may be based, at least in part, on values of the forward alignment matrix and values of the reverse alignment matrix.

Audio device auto-location

An audio processing system and method which calculates, based on spatial metadata of the audio object, a panning coefficient for each of the audio objects in relation to each of a plurality of predefined channel coverage zones. Converts the audio signal into submixes in relation to the predefined channel coverage zones based on the calculated panning coefficients and the audio objects. Each of the submixes indicating a sum of components of the plurality of the audio objects in relation to one of the predefined channel coverage zones. Generating a submix gain by applying an audio processing to each of the submix and controls an object gain applied to each of the audio objects. The object gain being as a function of the panning coefficients for each of the audio objects and the submix gains in relation to each of the predefined channel coverage zones.

Processing object-based audio signals

In some embodiments, a method for processing an audio signal in an audio processing apparatus is disclosed. The method includes receiving an audio signal and a parameter, the parameter indicating a location of an auditory event boundary. An audio portion between consecutive auditory event boundaries constitutes an auditory event. The method further includes applying a modification to the audio signal based in part on an occurrence of the auditory event. The parameter may be generated by monitoring a characteristic of the audio signal and identifying a change in the characteristic.

Audio control using auditory event detection

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

In an audio encoder, for audio content received in a source audio format, default gains are generated based on a default dynamic range compression (DRC) curve, and non-default gains are generated for a non-default gain profile. Based on the default gains and non-default gains, differential gains are generated. An audio signal comprising the audio content, the default DRC curve, and differential gains is generated. In an audio decoder, the default DRC curve and the differential gains are identified from the audio signal. Default gains are re-generated based on the default DRC curve. Based on the combination of the re-generated default gains and the differential gains, operations are performed on the audio content extracted from the audio signal.

Dynamic range control for a wide variety of playback environments

A multi-stream rendering system and method may render and play simultaneously a plurality of audio program streams over a plurality of arbitrarily placed loudspeakers. At least one of the program streams may be a spatial mix. The rendering of said spatial mix may be dynamically modified as a function of the simultaneous rendering of one or more additional program streams. The rendering of one or more additional program streams may be dynamically modified as a function of the simultaneous rendering of the spatial mix.

Managing playback of multiple streams of audio over multiple speakers

Media input audio data corresponding to a media stream and microphone input audio data from at least one microphone may be received. A first level of at least one of a plurality of frequency bands of the media input audio data, as well as a second level of at least one of a plurality of frequency bands of the microphone input audio data, may be determined. Media output audio data and microphone output audio data may be produced by adjusting levels of one or more of the first and second plurality of frequency bands based on the perceived loudness of the microphone input audio data, of the microphone output audio data, of the media output audio data and the media input audio data. One or more processes may be modified upon receipt of a mode-switching indication.

Media-compensated pass-through and mode-switching

Volume leveler controller and controlling method are disclosed. In one embodiment, A volume leveler controller includes an audio content classifier for identifying the content type of an audio signal in real time; and an adjusting unit for adjusting a volume leveler in a continuous manner based on the content type as identified. The adjusting unit may configured to positively correlate the dynamic gain of the volume leveler with informative content types of the audio signal, and negatively correlate the dynamic gain of the volume leveler with interfering content types of the audio signal.

Volume leveler controller and controlling method

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

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Alameda, CA, United States of America

Alan Jeffrey Seefeldt