Multi-flow block interleaving applied to distributed speech recognition over IP networks

Abstract Interleaving has shown to be a useful technique to provide robustdistributed speech recognition over IP networks. This is due toits ability to disperse consecutive losses. However, this ability isrelated to the delay introduced by the interleaver. In this work,we propose a novel multi-flow block interleaver which exploitsthe presence of several streams and allows to reduce the involveddelay. Experimental results have shown that this interleaver ap-proximates the performance of end-to-end interleavers but with afraction of their delay. As disadvantage, this interleaver must beplaced in a common node where more than one flow are available. Index Terms : distributed speech recognition, IP networks, inter-leaving, active networks. 1. Introduction Since its beginning, Internet has been growing in size, incorporat-ing many new networks, as well as in functionality, adding newservices. As many other features have been integrated into In-ternet, such as mailing, instant messaging, telephony and so on,speech enabled services (SES) are also being incorporated. Theseservices provide ubiquitous speech recognition, allowing multipleusers to remotely access and share high performance recognitionengines.A very attractive approach to speech recognition over IP net-works is the distributed speech recognition (DSR) solution [1]. Asmany other services over Internet, it is based on a client-serverarchitecture. On one hand, a simple and low power client (