In modern world, communication service providers are continuously met with the challenge of accommodating more users with in a limited allocated bandwidth. Due to this motivation service providers and manufactures are continuously in search of low bit rate speech coders that deliver high quality speech. The main objective of speech compression is to reduce the bits rate of speech for communicat...

Over the last decade major advances have been made in speech coding technology which is now widely used in international, digital mobile and satellite networks. The most recent techniques permit telephone network quality speech transmission at 8 kbit/s, but there are still demands for even lower rates and more flexible, good quality coding techniques for various network applications. This paper...

This paper examines a method for formant parameter extraction from a labeled single speaker database for use in a formantparameter diphone-concatenation speech synthesis system. This procedure commences with an initial formant analysis of the labelled database, which is then used to obtain formant (F1-F5) probability spaces for each phoneme. These probability spaces guide a more careful speaker...

Speech recognition over different transmission channels will set demands to the parametric encoded/decoded speech. The effects of different types of noise have been studied a lot and the effects of the parameterization process in speech has been known to cause degradation in decoded speech when compared to the original speech. But does the encoding/decoding process modify the speech so much tha...

Speech is one of the most complex signals an engineer has to handle. It is thus not surprising that its automatic processing has only recently found a wide market. In this paper we analyze the latest developments in speech coding, synthesis and recognition, and show why they were necessary for commercial maturity. Synthesis based on automatic unit selection, robust recognition systems, and mixe...

The method of speech coding CELP is extensively used in much voice communication-, multimedia-, video conference and other systems. There are a lot of papers related to CELP coding characteristics improvement for a better speech quality after decoding. Most of the papers are dedicated to lower the rate of CELP coded speech transmission. One problem related to low rate CELP speech transmission w...

We propose a variety of Hollywood’s film screenings as a productive tool for phonetic and prosodic research through analysis-by-synthesis. An initial study where the method is used to allow a potential target audience, rather than trained experts, to point out oddities in an extended stretch of connected synthesised speech is presented as proofof-concept.

Voice production models are used for speech compression thus reducing the encoding data rates and storage space for speech signaling processing. The legacy voice production model consists of a vocal source model and a vocal tract model. This paper presents a simpler voice production model adapted to waveform coding of speech: the Mathieu Waveform Coder (MWC) model. The MWC model yields weighted...