Cisco Technology, Inc.

Marcello Caramma

Michael Anthony Ramalho

Paul G Bright-Thomas

Geir Sandbakken

Greg Harald Hakonsen

William Geoffrey Prior

In one embodiment, a device in a network splits each of a plurality of packets of two or more data streams into an equal number of fragments. The number of fragments for packets of a particular one of the streams controls the level of error correction for that stream. The device generates recovery symbols for the fragments for each of the plurality of packets. Each of the plurality of packets has an equal sum of fragments plus recovery symbols. The device multiplexes the fragments and recovery symbols for each of the packets, to form a set of new packets. The device sends the set of new packets to one or more recipients in the network.

Bandwidth efficient FEC scheme supporting uneven levels of protection

A server receives, from each of a plurality of participant devices in a communication session, a respective one of a plurality of audio streams. The server estimates an audio energy of each of the plurality of audio streams and determines whether to perform a transform on at least one of the plurality of audio streams. If so, the server performs the transform on the at least one of the plurality of audio streams and transmits the at least one of the plurality of audio streams to at least one of the plurality of participant devices.

Selectively transforming audio streams based on audio energy estimate

Presented herein are downstream recovery (error correction) techniques for an aggregated/consolidated media stream. In one example, a consolidated media stream that includes source media packets from one or more sources is sent to one or more downstream receiving devices. Based on the source media packets, one or more self-describing recovery packets for downstream error correction of the source media packets are generated. The self-describing recovery packets include a mapping to the source media packets used to generate the self-describing recovery packets, thereby avoiding the addition of error correction information in the consolidated media stream. The one or more self-describing recovery packets are sent to each of the downstream receiving devices as a separate stream.

Self-describing error correction of consolidated media content

In one embodiment, a method includes extracting, by a processor, components from an audio signal to generate a modulating signal. The audio signal is generated by an endpoint operable to capture audio proximate the endpoint. The method also includes filtering, by the processor, the audio signal to generate a band-limited audio signal. The method also includes modulating, by the processor, the band-limited audio signal by the modulating signal to generate an enhancement signal. The method also includes combining, by the processor, the audio signal and the enhancement signal to generate an enhanced audio signal.

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Bracknell, United Kingdom

Marcello Caramma