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1. (WO2018054448) COMPRESSING AND DECOMPRESSING HAPTIC DATA FOR A PLURALITY OF CHANNELS

Pub. No.:    WO/2018/054448    International Application No.:    PCT/EP2016/072263
Publication Date: Fri Mar 30 01:59:59 CEST 2018 International Filing Date: Wed Sep 21 01:59:59 CEST 2016
IPC: H03M 7/30
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Inventors: GRANCHAROV, Volodya
ARAÚJO, José
ANDERSSON, Lars
Title: COMPRESSING AND DECOMPRESSING HAPTIC DATA FOR A PLURALITY OF CHANNELS
Abstract:
It is presented a method for compressing haptic data for a plurality of channels. The method is performed by an encoder and comprises the steps of: receiving respective samples, representing haptic data, in parallel from a plurality of channels; performing a lossy encoding, wherein, for each channel, compression of data is achieved at least partly by encoding differences between samples which are lower than a perceptual threshold as a no change codeword, the lossy encoding yielding respective codewords for each channel; grouping the codewords in groups; wherein each group contains codewords from a plurality of channels; generating a group index indicating whether each group contains only no change codewords or at least one codeword indicating a change; and outputting the group index along with codewords only for groups where at least one codeword indicates a change.