Imagination Technologies Limited

Prasad Puram

Senthil Kumar Mani

Voice data transmission with adaptive redundancy creates a voice data packet by packetizing the voice data payload and a number of redundant payloads selected from a set of previous voice data payloads. The voice data from the voice data payload is analysed to determine whether it is a critical or non-critical payload by classifying the received voice data as voiced or unvoiced. If at least a portion of the voice data is classified as unvoiced, the voice data payload is determined to be a critical payload. If it is a critical payload, then the voice data payload is added to the set of previous voice data payloads for inclusion as a redundant payload in subsequent voice data packets. The voice data packet is then forwarded for transmission over the network.

Voice data transmission with adaptive redundancy

A sequence number is used to indicate where a payload of a voice data packet should fit in a data stream and a technique is described for retrieving the sequence number for redundant payloads. A receiver maintains a history of previously received timestamps and sequence numbers for previous payloads. A received packet is unpacked to obtain a primary payload and its associated sequence number and timestamp, and a redundant payload and its associated timestamp offset. The primary payload sequence number and timestamp are stored in the history. A time-span of the data stream covered by the packet is found using the timestamp offset, and a portion of the history selected based on the time-span. A timestamp parameter for the redundant payload is calculated using the primary payload timestamp and the timestamp offset, and is compared to timestamps in the selected portion of the history to derive the redundant payload sequence number. The history is updated to include the timestamp parameter and sequence number of the redundant payload.

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Hyderabad Telangana, India

Prasad Puram