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When Higher Order Ambisonics (HOA) is used to represent a sound field, the channels might contain a lot of redundancy in some cases. This redundancy can be exploited in order to provide more efficient network transmission and storage. In this work the amount of inter-channel redundancy for Higher Order Ambisonics is investigated. Furthermore, lossless compression techniques that build on this redundancy...
A system for streaming lossless audio with low delay over IP networks is presented. To achieve error robustness, the signal is divided into a base and an enhancement layer when the network is approaching congestion. The base layer is perceptually encoded using a time-varying pre- and postfilter, and this layer is transported using a high priority traffic class in a Differentiated Services (DiffServ)...
This work investigates the effects of packet loss on perceived audio quality using an acceptability test, seeking to identify the maximum amount of packet loss that can be tolerated before the quality becomes unacceptable. An acceptability test is faster and easier for the subjects than traditional tests such as ITU-R BS.1116 or MUSHRA. It is seen that the acceptability decreases quickly as the packet...
This paper presents an unequal error protection (UEP) scheme for audio streaming over IP networks. The sender simulates packet loss by employing the same error concealment scheme as the receiver for each audio frame. The perceived quality of such an estimated frame is compared to that of a lower bit rate version. Whenever the quality of the estimated frame is below a given threshold relative to a...
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