On the cost of backward compatibility for communication codecs
نویسندگان
چکیده
Super wideband (SWB) communication calls more and more attention as can be seen by the standardization activities of SWB extensions for well-established wideband codecs, e.g. G.722 or G.711.1. This paper presents a technical solution for extending the G.722 codec and compares the new technology to other standardized SWB codecs. Hereby, a closer look is given on the concept of extending technologies to more capabilities in contrast to non-backwards compatible solutions.
منابع مشابه
Robust Video Transmission over a Lossy Network Using a Distributed Source Coded Auxiliary Channel
Predictive video codecs such as MPEG and H.26x are very susceptible to prediction mismatch between encoder and decoder or “drift” when there are packet losses, leading to a significant reduction in the decoded quality. Targeting backward compatibility with standard predictive video codecs, we propose a method that is conceptually different from conventional error protection schemes and inspired...
متن کاملEnhancing privacy of recent authentication schemes for low-cost RFID systems
Nowadays Radio Frequency Identification (RFID) systems have appeared in lots of identification and authentication applications. In some sensitive applications, providing secure and confidential communication is very important for end-users. To this aim, different RFID authentication protocols have been proposed, which have tried to provide security and privacy of RFID users. In this paper, we a...
متن کاملSymmetric Encryption Algorithm in Speech Coding for Defence Communications
In battlefield, messages must be encrypted to provide protection from enemy interception. Several speech coding algorithms have been developed to provide secure communications. FS1015 LPC in 1984, FS1016 CELP in 1991and FS MELP in 1997 became official federal standards. In 2002, the US DoD adopted enhanced MELP (MELPe). Later on in 2007, US Naval Research Laboratories have designed Variable Dat...
متن کاملSecure and Efficient Distributed Relay-Based Rekeying Algorithm for Group Communication in Mobile Multihop Relay Network
In mobile multihop relay (MMR) networks, Relay multicast rekeying algorithm (RMRA) is meant to ensure secure multicast communication and selective updating of keys in MMR networks. However, in RMRA, the rekeying is carried out after a specific interval of time, which cannot ensure the security for multicast communication on joining the member. Secondly, the rekeying scheme generates a huge comm...
متن کاملMPEG: A Video Compression Standard for Multimedia Applications
Published in Communication of the ACM – Special Issue on Digital Multimedia Systems back in April 1991, “MPEG: A Video Compression Standard for Multimedia Applications” presents an overview of MPEGVideo which has become an international standard for video compression techniques. The development of video technology in the 1980s enabled the use of digital video for telecommunication, digital broa...
متن کامل