The following is one of a series of papers developed or produced by the Economic Analysis Division of the John A. Volpe National Transportation Systems Center as part of its research project looking into issues surrounding user response and market development for selected Intelligent Vehicle-Highway Systems (IVHS) products or services. The project, sponsored by the Federal Highway Administratio...

In this paper, we describe tile results of using this semi-automatic tool to port the (',e, udli i NL system to the ATIS domahi , a (lomltin tha t ( ienl ini had ah'eady been ported to, arid for which it ]lad achiew~,d high perl'orluance ~ttld gi'al ' li l l iatical coverage using hand-wri t ten sortal constraints. Chossing a known domain, rather than a new one, allowed us to compare tile perfo...

In this paper we present a new automatic male/female classi cation method based on the location in the frequency domain of the rst 2 formants. This classi cation is based on a new automatic formant extraction which is faster than a peak picking technique. Gender-dependent acoustic-phonetic models stemming from this classi cation are used in the INRS Continuous speech recognition system with ATI...

Modern digital communication systems utilize OFDM and DS-CDMA signals because of their superior spectral efficiency and multiple access properties respectively. Examples of such systems include digital television (DVB-T), digital radio (DAB) and 3 Generation mobile (WCDMA). A downside to using these signals however is the need to accommodate their very high Crest Factor, also known as Peak-to-A...

We are currently developing the advanced broadcasting system for next generation of digital terrestrial television (DTTB). Its physical layer, Advanced Integrated Services Digital Broadcasting-Terrestrial (Advanced ISDB-T), is based on frequency division multiplexing, and large-scale field tests have been conducted at experimental transmitter stations. transport MPEG Media Transport (MMT), Inte...

Signal optimization is affected during radio links between a transmitter and a receiver located in adjacent material media with differing optical densities. The optimization is carried out via the automated control theory method. The radio signal obtained after the optimization is coordinated with the two media's electrical characteristics simultaneously; and this enables low power and small an...

The demand of bandwidth has increased in recent years with the advent of new technologies in wireless communication systems along with the rise of traffic flow. This has resulted the radio spectrum into a scarce entity. However, recent measurements suggest that some part of the licensed spectrum is not efficiently utilized due to static spectrum allocation. TV broadcast systems operating in lic...