Dolby Laboratories Licensing Corporation

Dolby International Ab

Craig Johnston

Glenn N Dickins

Heiko Purnhagen

Xuejing Sun

Richard James Cartwright

Dong Shi

Michael Eckert

Gary Spittle

Paul Francis Holmberg

Paul Andrew Boustead

Feng Deng

Vinh Nguyen

A communication system, method, and computer-readable medium therefor comprise a media server configured to receive a plurality of audio streams from a corresponding plurality of client devices, the media server including circuitry configured to rank the plurality of audio streams based on a predetermined metric, group a first portion of the plurality of audio streams into a first set, the first portion of the plurality of audio streams being the N highest-ranked audio streams, group a second portion of the plurality of audio streams into a second set, the second portion of the plurality of audio streams being the M lowest-ranked audio streams, forward respective audio streams of the first set to a receiver device, and discard respective audio streams of the second set, wherein N and M are independent integers.

Scalable voice scene media server

A method () for determining an estimate () of an echo path property of an electronic device (). The electronic device is configured to render a total audio signal using a loudspeaker (), and the electronic device is configured to record an echo of the rendered audio signal using a microphone (), thereby yielding a recorded audio signal (). The method comprises inserting (), in an inaudible manner, an auxiliary audio signal () into the total audio signal to be rendered; wherein the auxiliary audio signal () comprises a tonal audio signal at a first frequency; isolating () the echo of the auxiliary audio signal () from the recorded audio signal (); and determining () the estimate () of the echo path property based on the inserted auxiliary audio signal () and based on the isolated echo of the auxiliary audio signal ().

Echo control through hidden audio signals

A conferencing server () receives incoming bitstreams (I, I, I, I, I) carrying media data from respective conferencing endpoints (); receives a mixing strategy (M) specifying properties of at least one outgoing bitstream (O, O, O, O, O) and requiring at least one additive media mixing step; and supplies at least one outgoing bitstream by executing, in a processor () and a memory () with a plurality of memory spaces, a run list of operations selected from a predefined collection of primitives and realizing the received mixing strategy. A pre-processor () in the server derives said run list repeatedly and dynamically while taking into consideration determined momentary activity in each incoming bitstream. In embodiments, the run list may be derived by (a) pruning of an initial run list, (b) constrained or non-constrained minimization of a cost function, or (c) automatic code generation.

Layered mixing for sound field conferencing system

The present document relates to methods and systems for setting up and managing two-dimensional or three-dimensional scenes for audio conferences. A conference controller () configured to place L upstream audio signals () within a 2D or 3D conference scene to be rendered to a listener () is described. The conference controller () is configured to set up a X-point conference scene; assign L upstream audio signals () to X talker locations (); determine a maximum number N of downstream audio signals () to be transmitted to the listener (); determine N downstream audio signals () from the L assigned upstream audio signals (); determine N updated talker locations for the N downstream audio signals (); and generate metadata identifying the updated talker locations and enabling an audio processing unit () to generate a spatialized audio signal.

Clustering of audio streams in a 2D / 3D conference scene

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Sydney, Australia

Craig Johnston