Description

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

HD Telephony by Artificial Bandwidth Extension

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Paperback by Ph.D. Schlien Dr Thomas Matthias

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Short Description:

The audio bandwidth of digital landline and mobile telephone networks is still mostly restricted to 200 Hz to 3.4 kHz.... Read more

    Publisher: Verlag G. Mainz
    Publication Date: 1/30/2021
    ISBN13: 9783958863507, 978-3958863507
    ISBN10: 3958863507

    Non Fiction , Technology, Engineering & Agriculture , Education

    Description

    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

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