By A. Nejat Ince (auth.), A. Nejat Ince (eds.)

ISBN-10: 1441951288

ISBN-13: 9781441951281

ISBN-10: 147572148X

ISBN-13: 9781475721485

After alm ost 3 ratings of years of simple and utilized learn, the sphere of speech processing is, at the moment, present process a quick progress when it comes to either functionality and purposes and this can be fueHed by way of the advances being made within the components of microelectronics, computation and set of rules design.Speech processing pertains to 3 elements of voice communications: -Speech Coding and transmission that is typically keen on man-to­ guy voice communique. -Speech Synthesis which offers with machine-to-man conversation. -Speech reputation that's regarding man-to-machine communique. frequent software and use of low-bit price voice codec.>, synthesizers and recognizers that are all speech processing items calls for ideaHy the world over authorized caliber evaluation and assessment equipment as weH as speech processing criteria so they will be interconnected and used independently in their designers and brands with out expensive interfaces. This publication offers, in an educational demeanour, either basic and utilized elements of the above themes that have been ready through weH-known experts of their respective components. The e-book relies on lectures which have been backed by means of AGARD/NATO and added via the authors, in different NATO international locations, to audiences consisting in general of educational and commercial R&D engineers and physicists as weH as civil and armed forces C3I platforms planners and designers.

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Extra info for Digital Speech Processing: Speech Coding, Synthesis and Recognition

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There are two basic types of speech sound which can be produced, namely voiced and unvoiced sounds. Voiced sounds occur when the vocal chords are tightened in scuh a way that the subglottal air pressure forces them to open and close quasi-periodically, thereby generating "puffs" of air which acoustically excite the vocal cavities. The pitch of voiced sounds is simply the frequency at which the vocal chords vibrate. On the other hand, unvoiced sounds are produced by forced air turbulence at a point of constriction in the vocal tract, giving rise to a noise-like excitation, or "hiss".

Especially during those phases with a high pilot workload, the mission and aircraft data must be formatted and displayed in such a way that the quality and rate of information to be extracted by the pilot is sufficient to arrive at major complex decisions within 2 to 5 seconds without exceeding the pilot's peak workload capacity. In some cases this also implies that the pilot must delegate some of the lower priority (but still important) decisions to an automated device without risk of conflict.

The methods are divided into three groups: - Subjective and objective assessment for speech coding and transmission systems. - Subjective and objective quality measures for speech output systems (synthesisers). - Assessment methods for automatie speech recognition systems. Mr Steeneken discusses in Chapter 6 assessment methods for these three groups of speech processing systems. The first two systems require an evaluation in terms of intelligibility measures while the evaluation of speech recognisers requires a different approach as the recognition rate normally depends on recogniser-specifIc parameters and external factors.

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Digital Speech Processing: Speech Coding, Synthesis and Recognition by A. Nejat Ince (auth.), A. Nejat Ince (eds.)


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