Methods and Apparatuses For DTX Hangover in Audio Coding

摘要

Transmitting node and receiving node for audio coding and methods therein. The nodes being operable to encode/decode speech and to apply a discontinuous transmission (DTX) scheme comprising transmission/reception of Silence Insertion Descriptor (SID) frames during speech inactivity. The method in the transmitting node comprising determining, from amongst a number N of hangover frames, a set Y of frames being representative of background noise, and further transmitting the N hangover frames, comprising at least said set Y of frames, to the receiving node. The method further comprises transmitting a first SID frame to the receiving node in association with the transmission of the N hangover frames, where the SID frame comprises information indicating the determined set Y of hangover frames to the receiving node. The method enables the receiving node to generate comfort noise based on the hangover frames most adequate for the purpose.

主权项

1. A method performed by transmitting node, the node being operable to encode speech and to apply a discontinuous transmission, DTX, scheme comprising transmission of Silence Insertion Descriptor (SID) frames during speech inactivity, the method comprising:
determining, from amongst a number N of DTX hangover frames, a set Y of frames comprising noise being representative of background noise; transmitting the N hangover frames, comprising at least said set Y of frames, to a receiving node; and enabling the receiving node to generate comfort noise based on the set Y of hangover frames, where Y is a set of size variable in the range of 1 to N, wherein the enabling step comprises transmitting a first SID frame to the receiving node in association with the transmission of the N hangover frames, where the SID frame comprises information indicating the determined set Y of hangover frames to the receiving node.