Assessment and Prediction of Speech Quality in by Sebastian Möller

By Sebastian Möller

The caliber of a telecommunication voice provider is essentially inftuenced by means of the standard of the transmission approach. however, the research, synthesis and prediction of caliber may still bear in mind its multidimensional points. caliber will be considered as some degree the place the perceived features and the specified or anticipated ones meet. A schematic is gifted which classifies diversified entities which give a contribution to the standard of a carrier, considering conversational, consumer as weIl as provider similar contributions. ranging from this idea, perceptively suitable components of speech verbal exchange caliber are pointed out. The perceptive elements end result from ele­ ments of the transmission configuration. A simulation version is built and applied which permits the main proper parameters of conventional trans­ venture configurations to be manipulated, in genuine time and for the dialog state of affairs. Inputs into the simulation are instrumentally measurable caliber components primary in transmission making plans of cellphone networks. a discounted set of those caliber parts types a foundation for types which goal at predicting mouth-to-ear caliber because it will be perceived by way of a person of the sys­ tem. those versions are a huge device for the planner of telecommunication networks, as they enable the predicted caliber to be expected upfront, even ahead of the community has been arrange. recognized versions (the SUBMOD and the E-model) are analyzed in additional element, with an emphasis at the psy­ choacoustic and psychophysical backgrounds.

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Assessment and Prediction of Speech Quality in Telecommunications

The standard of a telecommunication voice carrier is essentially inftuenced through the standard of the transmission process. however, the research, synthesis and prediction of caliber should still take into consideration its multidimensional features. caliber should be considered as some degree the place the perceived features and the specified or anticipated ones meet.

Extra resources for Assessment and Prediction of Speech Quality in Telecommunications

Example text

The MNRU and its related effects will be discussed later in Section 2 of Chapter 6. As a general rule, the perceptive effect of noise depends on the power, on the frequency distribution and on the amplitude distribution of the noise. The loudness of wideband circuit noise is generally characterized by the level measured using a s

The system should, if necessary, be flexible enough to include future impairments or equipment with special transmission characteristics as easily as possible. Factors Influencing the Quality 0/ Service 39 • The simulation should work in listening-only and conversation scenarios, using the same transmission characteristics. • It is important that the terminal which is provided for the assessing person matches the one which is encountered in areal application. , for the test subject as weIl as for a potential conversation partner normal standard handsets or, if desired, headsets or hands-free terminals should be provided.

5) should be adjustable within reasonable limits. The manipulation should be fast and easy to use, in order to simulate connections with different transmission characteristics within one auditory test session. • In order to be able to carry out conversation experiments (see Section 3 of Chapter 4), the transmission should work in real time and should respect the delays encountered in networks. • The system should, if necessary, be flexible enough to include future impairments or equipment with special transmission characteristics as easily as possible.

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