By Sebastian Möller
The caliber of a telecommunication voice provider is basically inftuenced via the standard of the transmission method. however, the research, synthesis and prediction of caliber should still keep in mind its multidimensional features. caliber should be considered as some degree the place the perceived features and the specified or anticipated ones meet. A schematic is gifted which classifies varied entities which give a contribution to the standard of a provider, considering conversational, person as weIl as carrier comparable contributions. ranging from this idea, perceptively correct parts of speech communique caliber are pointed out. The perceptive components consequence from ele ments of the transmission configuration. A simulation version is built and carried out which permits the main proper parameters of conventional trans project configurations to be manipulated, in actual time and for the dialog scenario. Inputs into the simulation are instrumentally measurable caliber components ordinary in transmission making plans of phone networks. a discounted set of those caliber parts kinds a foundation for versions which target at predicting mouth-to-ear caliber because it will be perceived by means of a consumer of the sys tem. those types are a massive software for the planner of telecommunication networks, as they enable the anticipated caliber to be anticipated upfront, even ahead of the community has been arrange. famous 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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Extra info for Assessment and Prediction of Speech Quality in Telecommunications
Microphone and loudspeaker signals are directly connected to the simulator, so that the sidetone path can be controlled. For experiments with mobile telephones, a mobile handset (type 'Sinus 43') was fit with an electret microphone (type 'Sennheiser KE 4') and a typicalloudspeaker. In this case as weIl, microphone and loudspeaker signals are directly coupled to the simulator, using a thin cable connection which avoids degradations inherent in wireless transmission. The usage of a wired handset has to be taken into account for the assessment results.
600-800 Hz. In the higher frequency region, the electrical sidetone path is important for preserving good conversational conditions in high ambient noise conditions (ITU-T Rec. 76, 1989). Therefore, more emphasis is put on the high frequency areas of the electrical sidetone path than this is done for SLR, RLR and OLR. 1 a comparison is made between the weighting factors for 0 LR, for ST M Rand for the echo loss, Le. 18 is expressed by N K i . 27) It can be seen that for both sidetone and echo paths lower frequency components are neglected.
This is the major issue of the proposed classification. In a first place, the entities allow to analyze which quality dimensions are inftuenced by the physical transmission characteristics and service parameters. ) which have different impact to various quality dimensions, cf. Chapter 3. Then, quality assessment methods are presented which scope at different quality dimensions. It is shown that the differences according to the QoS concept have major consequences for choosing appropriate methodologies in order to obtain valid quality judgments (see Chapter 4).