A framework for joint source/channel coding of speech is presented. It is based on a harmonic representation of the speech signal and facilitates efficient quantization of harmonic amplitudes and phases both in a single description and a multiple description setting. Furthermore, it combines high-quality packet loss concealment with efficient source coding and multiple description coding. Two p...

Until very recently, joint source channel techniques mostly focused on systems using fixed-length coding, eventhough variable-length coding (VLC) is widely used, particularly in video coding. Typically, VLC bit streams are made channel-robust through packetization and standard forward-error correction (FEC). However, when the channel conditions are fairly mild, FEC can reveal itself bandwidth-i...

We introduce a new scheme to realize suspended, multiterminal graphene structures that can be current annealed successfully to obtain uniform, very high quality devices. A key aspect is that the bulky metallic contacts are not connected directly to the part of graphene probed by transport measurements, but only through etched constriction, which prevents the contacts from acting invasively. The...

A robust and an efficient source and channel coding algorithms is proposed in this paper for the purpose of progressive transmission of images over wireless communication systems. This paper presents a modified orthogonal frequency division multiplexing system for robust progressive image transmission. A joint source channel coder is employed in the modified OFDM system. The set Partioning hier...