Qualcomm Incorporated

Nils Günther Peters

Dipanjan Sen

Moo Young Kim

Martin James Morrell

Siddhartha Goutham Swaminathan

S M Akramus Salehin

Isaac Garcia Munoz

Ferdinando Olivieri

Shankar Thagadur Shivappa

Taher Shahbazi Mirzahasanloo

Thomas Stockhammer

Pei Xiang

Richard Paul Walters

Imed Bouazizi

Ricardo De Jesus Bernal Castillo

Eric Stephen Mattis

Andre Gustavo P Schevciw

Jason Filos

Mark Adam Cherry

Jeongook Song

Daniel Weber

In general, techniques are described by which to synchronize enhanced audio transports with backward compatible audio transports. A device comprising a memory and one or more processors may be configured to perform the techniques. The memory may store a backward compatible bitstream conforming to a legacy transport format. The processor may obtain, from the backward compatible bitstream, a first audio transport stream, and obtain, from the backward compatible bitstream, a second audio transport stream. The processor(s) may also obtain, from the backward compatible bitstream, indications representative of synchronization information for the first audio transport stream and the second audio transport stream. The processor(s) may synchronize, based on the indications, the first audio transport stream and the second audio transport to obtain synchronized audio data stream. The processor(s) may obtain, based the synchronized audio data, enhanced audio data, and output the enhanced audio data to one or more speakers.

Synchronizing enhanced audio transports with backward compatible audio transports

A device comprising a memory and one or more processors may be configured to perform the techniques described in this disclosure. The memory may be configured to store the encoded scene-based audio data. The one or more processors may be configured to obtain an operating condition of the device for decoding the encoded scene-based audio data and perform, based on the operating condition, psychoacoustic audio decoding with respect to the encoded scene-based audio data to obtain ambisonic transport format audio data. The one or more processors may also be configured to perform spatial audio decoding with respect to the ambisonic transport format audio data to obtain scene-based audio data.

Performing psychoacoustic audio coding based on operating conditions

In general, techniques are described for quantizing spatial components based on bit allocations determined for psychoacoustic audio coding. A device comprising a memory and one or more processors may perform the techniques. The memory may store a bitstream including an encoded foreground audio signal and a corresponding quantized spatial component. The one or more processors may perform psychoacoustic audio decoding with respect to the encoded foreground audio signal to obtain a foreground audio signal, and determine, when performing the psychoacoustic audio decoding, a first bit allocation for the encoded foreground audio signal. The one or more processors may also determine, based on the first bit allocation, a second bit allocation, and dequantize, based on the second bit allocation, the quantized spatial component to obtain a spatial component. The one or more processors may reconstruct, based on the foreground audio signal and the spatial component, scene-based audio data.

Quantizing spatial components based on bit allocations determined for psychoacoustic audio coding

In general, techniques are described for psychoacoustic audio coding of ambisonic audio data. A device comprising a memory and one or more processors may be configured to perform the techniques. The memory may store the bitstream that includes an encoded audio object and a corresponding spatial component that defines spatial characteristics of the encoded foreground audio signal. The encoded foreground audio signal may include a coded gain and a coded shape. The one or more processors may perform a gain and shape synthesis with respect to the coded gain and the coded shape to obtain a foreground audio signal, and reconstruct, based on the foreground audio signal and the spatial component, the ambisonic audio data.

Psychoacoustic audio coding of ambisonic audio data

An example device includes a memory configured to store a plurality of representations of a soundfield, each representation of the soundfield comprising a different set of ambisonic coefficients representative of the same soundfield at concurrent periods of time. The device also includes a processor, coupled to the memory, and the processor is configured to perform audio playback based on a field of view and on a particular representation of the soundfield from the plurality of representations.

Mixed-order ambisonics (MOA) audio data for computer-mediated reality systems

An example audio decoding device includes a memory configured to store at least a portion of a coded audio bitstream; and one or more processors configured to: decode, based on the coded audio bitstream, a representation of a soundfield; decode, based on the coded audio bitstream, a syntax element indicating a selection of either a head-related transfer function (HRTF) or a binaural room impulse response (BRIR); and render, using the selected HRTF or BRIR, speaker feeds from the soundfield.

Signaling for rendering tools

Systems and methods for determining parameter adjustments for a capture of audio are disclosed. The systems and methods includes processing circuitry configured to access at least one energy map that corresponds to one or more audio streams. The processing circuitry may then determine, from the at least one energy map, a parameter adjustment with respect to at least one audio element. The parameter adjustment may be configured to adjust the capture of audio by the at least one audio element. In addition, the process circuitry may be configured to output an indication indicating the parameter adjustment with respect to the at least one audio element.

Adjustment of parameter settings for extended reality experiences

A device and method for backward compatibility for virtual reality (VR), mixed reality (MR), augmented reality (AR), computer vision, and graphics systems. The device and method enable rendering audio data with more degrees of freedom on devices that support fewer degrees of freedom. The device includes memory configured to store audio data representative of a soundfield captured at a plurality of capture locations, metadata that enables the audio data to be rendered to support N degrees of freedom, and adaptation metadata that enables the audio data to be rendered to support M degrees of freedom. The device also includes one or more processors coupled to the memory, and configured to adapt, based on the adaptation metadata, the audio data to provide the M degrees of freedom, and generate speaker feeds based on the adapted audio data.

Six degrees of freedom and three degrees of freedom backward compatibility

A device may be configured to play one or more of a plurality of audio streams. The device may include a memory configured to store the plurality of audio streams, each of the audio streams representative of a soundfield. The device also may include one or more processors coupled to the memory, and configured to present a user interface to a user, obtain an indication from the user via the user interface representing a desired listening position, select, based on the indication, at least one audio stream of the plurality of audio streams, and output, for a display and in response to obtaining the indication representing the desired listening position, a graphical user interface element suggesting an alternative listening position.

User interface feedback for controlling audio rendering for extended reality experiences

In general, techniques are described for obtaining audio rendering information from a bitstream. A method of rendering audio data includes receiving, at an interface of a device, an encoded audio bitstream, storing, to a memory of the device, encoded audio data of the encoded audio bitstream, parsing, by one or more processors of the device, a portion of the encoded audio data stored to the memory to select a renderer for the encoded audio data, the selected renderer comprising one of an object-based renderer or an ambisonic renderer, rendering, by the one or more processors of the device, the encoded audio data using the selected renderer to generate one or more rendered speaker feeds, and outputting, by one or more loudspeakers of the device, the one or more rendered speaker feeds.

Flexible rendering of audio data

An example device includes a memory configured to store audio data and location data associated with a plurality of audio streams and one or more processors coupled to the memory. The one or more processors are configured to obtain a first location of a first audio stream that includes an audio source and obtain a second location of a second audio stream that includes the audio source. The one or more processors are configured to generate direction vectors originating at the first location and the second location, based on a location of the audio source and the first location, and the location of the audio source and the second location, respectively. The one or more processors are also configured to determine parameters that describe a vector field based on the first direction vector and the second direction vector.

Correlation-based rendering with multiple distributed streams accounting for an occlusion for six degree of freedom applications

A device configured to decode a bitstream, where the device includes a memory configured to store a temporally encoded representation of spatial audio signals. The device is also configured to receive the bitstream that includes an indication of a spatial transformation, and includes a temporal decoding unit, coupled to the memory, configured to decode one or more spatial audio signals represented in a spatial domain, where the one or more spatial audio signals are associated with different angles in the spatial domain. In addition, the device includes an inverse spatial transformation unit, coupled to the temporal decoding unit, is configured to convert the one or more spatial audio signals represented in the spatial domain into at least three ambisonic coefficients that, in part, represent a soundfield in an ambisonics domain, and perform a spatial transformation of the soundfield based on the indication of the spatial transformation received in the bitstream.

Spatial transformation of ambisonic audio data

An example device for processing one or more audio streams includes a memory configured to store the one or more audio streams and one or more processors implemented in circuitry coupled to the memory. The one or more processors are configured to determine a listener position. The one or more processors are also configured to determine one or more clusters of the one or more audio streams. The one or more processors are also configured to determine a rendering mode based on the listener position and the one or more clusters. The device also includes a renderer configured to render at least one of the one or more clusters of audio streams based on the rendering mode.

Smart hybrid rendering for augmented reality/virtual reality audio

In general, techniques are described by which to correlate scene-based audio data for psychoacoustic audio coding. A device comprising a memory and one or more processors may be configured to perform the techniques. The memory may store a bitstream including a plurality of encoded correlated components of a soundfield represented by scene-based audio data. The one or more processors may perform psychoacoustic audio decoding with respect to one or more of the plurality of encoded correlated components to obtain a plurality of correlated components, and obtain, from the bitstream, an indication representative of how the one or more of the plurality of correlated components were reordered in the bitstream. The one or more processors may reorder, based on the indication, the plurality of correlated components to obtain a plurality of reordered components, and reconstruct, based on the plurality of reordered components, the scene-based audio data.

Correlating scene-based audio data for psychoacoustic audio coding

In some examples, a content consumer device configured to play one or more of a plurality of audio streams includes a memory configured to store the plurality of audio streams and audio location information associated with the plurality of audio streams and representative of audio stream coordinates in an acoustical space where an audio stream was captured or synthesized or both. Each of the audio streams is representative of a soundfield. The content consumer device also includes one or more processors coupled to the memory, and configured to determine device location information representative of device coordinates of the content consumer device in the acoustical space. The one or more processors are configured to select, based on the device location information and the audio location information, a subset of the plurality of audio streams, and output, based on the subset of the plurality of audio streams, one or more speaker feeds.

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San Diego, CA, United States of America

Nils Günther Peters