This paper deals with the problem of modeling of phase noise in OFDM systems and the impact it may have on the bit error rate performance of such systems subject to a number of system variables and to a number of channel conditions which may be encountered when such systems are deployed for certain applications such as high speed wireless LANs and Digital Television Terrestrial Broadcasting (DT...

Prosodic patterns provide important cues for resolving syntactic ambiguity, and might be used to improve the accuracy of automatic speech understanding. With this goal, we propose a method of scoring syntactic parses in terms of observed prosodic cues, which can be used in ranking sentence hypotheses and associated parses. Speciically, the score is the probability of acoustic features of a hypo...

Previous attempts to automatically determine multi-words as the basic unit for language modeling have been successful for extending bigram models 10, 9, 2, 8] to improve the per-plexity of the language model and/or the word accuracy of the speech decoder. However, none of these techniques gave improvements over the trigram model so far, except for the rather controlled ATIS task 8]. We therefor...

Since February 91, the ATIS database has been updated and, in an effort to quickly collect a larger amount of training and test data, a concerted effort has taken place in collecting data at five different sites (AT&T, BBN, CMU, MIT, and SRI). (See [1] for details.) About 10,000 spontaneous utterances were collected, of which about half were annotated (text transcriptions, reference answers, et...

This paper describes a recently collected spoken language corpus for the ATIS (Air Travel Information System) domain. This data collection effort has been co-ordinated by MADCOW (Multi-site ATIS Data COllection Working group). We summarize the motivation for this effort, the goals, the implementation of a multi-site data collection paradigm, and the accomplishments of MADCOW in monitoring the c...

In this paper, we address semantic parsing in a multilingual context. We train one multilingual model that is capable of parsing natural language sentences from multiple different languages into their corresponding formal semantic representations. We extend an existing sequence-to-tree model to a multi-task learning framework which shares the decoder for generating semantic representations. We ...

Nowadays, the industrial and technological context is characterised by the uncertainty and the complexity of its evolutions. In this boarder, companies, particularly in the manufacturing and product design fields, need flexible and adaptable Information Systems (IS) to support their business strategies as well as to facilitate their adaptation to the evolutions of the external environment. In t...

SRI International participated in the June 1990 Air Travel Information System (ATIS) natural-language evaluation. This report briefly describes the system that SRI used in the evaluation, analyzes SRI's results, and makes some recommendations for changes in the database structure and data collection system to be used for future ATIS evaluations.

Genesis and ATIS are being developed under the umbrella of the Intelligent Transportation Systems to facilitate various kinds of travel, including daily commuting to work via private/public transportation and visiting new places and points of attraction. Travelers are naturally mobile, and the most eeective way to disseminate information to travelers is with wireless communications, which is be...