HD Telephony by Artificial Bandwidth Extension

Idioma: inglés

Editorial: Verlag G. Mainz, DE, 2021

3958863507 / 9783958863507

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Librería: Rarewaves.com UK, London, Reino UnidoRarewaves.com UK

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The audio bandwidth of digital landline and mobile telephone networks is still mostly restricted to 200 Hz to 3.4 kHz. This is due to compatibility requirements during the transition phase from analogue to digital transmission technology. The resulting characteristic "telephone speech" is widely accepted, but the intelligibility of syllables is only 91%.Meanwhile, improved coding standards for so-called "HD voice" or "Wideband Speech" have been developed which are gradually being introduced into the networks. They support an audio frequency bandwidth of 50 Hz to 7.0 kHz with significantly increased audio quality and speech intelligibility. For a very long time however, new HD-telephones and old narrowband telephones have to co-exist. If an HD-terminal is connected over a narrowband link to an old telephone, the improved coding scheme cannot be used.In this thesis, signal processing concepts are developed for improving audio quality and intelligibility of narrowband speech by artificial bandwidth extension (ABWE). These algorithms can be applied in the HD terminals or in the network, to transform narrowband speech to HD voice. Based on the source-filter model of speech production and a priori knowledge of the characteristics of speech signals, the missing frequency components between 3.4 kHz and 7 kHz are reconstructed. In comparison to the state-of-the-art ABWE approaches, the main contributions are. new concepts of estimating the wideband spectral envelope, e.g., in terms of the model filter by interpolation in the acoustic tube domain. algorithms for spectral extension of the excitation signal. new insights concerning the relative importance of the excitation, the temporal envelope and the spectral envelope. remarkable improvements of the audio quality . significant low computational complexity. efficient and effective training and estimation algorithms The improvements are verified by objective evaluation and subjective listening tests.…

N° de ref. del artículo LU-9783958863507

Título
HD Telephony by Artificial Bandwidth Extension
Autor
Thomas Matthias Schlien
Editorial
Verlag G. Mainz, DE
Año de publicación
2021
Estado
New
Encuadernación
Paperback
Idioma
inglés
ISBN 10
3958863507
ISBN 13
9783958863507
Peso del artículo
178 gramos

Rarewaves.com UK

London, Reino Unido

Vendedor de 5 estrellas

Vendedor de IberLibro desde 11 de junio de 2025

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ArtículoDe 60 a 60 días hábilesDe 60 a 60 días hábiles
Primer artículoEUR 77,88EUR 119,81
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