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Sound acoustics |
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Ingenieurbüro für Nachrichtentechnik und Akustik |
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Quality enhancement of Standardized CODECs |
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Up to now the quality of the standardized TETRA Codec is limited. Especially frequently appearing background noise introduces remarkable quality degradation, leading to unacceptable intelligibility. The objective quality measure amounts less than 3 on the MOS scale for about 50 % of all applications in natural environment . |
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The new parameterization is also suitable for quality enhancement of current products.
Optional extensions as the quality optimization of stolen frames and a method for bandwidth extension of the speech signal at a standard corresponding bit rate are available for TETRA-C.
Please contact us if you need more information about this topic.
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TETRA-C is a new standard conform SW library in C++.
A remarkable quality enhancement could be achieved with the aid of hearing adequate parameterisation of 25 parameters.
In spite of this changing the parameter transfer is standard compatible.
TETRA-C requires only 1% of the computational power of a simple PC. |
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Objective quality evaluation at different test scenarios. |