ETSI - EG 202 396-2
Speech Processing, Transmission and Quality Aspects (STQ); Speech Quality performance in the presence of background noise; Part 2: Background noise transmission - Network simulation - Subjective test database and results
| Organization: | ETSI |
| Publication Date: | 1 July 2006 |
| Status: | inactive |
| Page Count: | 65 |
scope:
The present document aims at setting up and verifying a transmission network simulation environment using realistic network scenarios for laboratory use in the context of background noise transmission in WideBand (WB) audio conversational applications.
Background noise is a problem in mostly all situations and conditions and needs to be taken into account in both terminals and networks. The document provides information about the transmission network impairments in packet based communication network since these effects tend to aggravate the consequences of background noise and need to be considered carefully. The present document includes:
• Setup of simulation environment (network and signal processing in terminals) providing comparable network characteristics and traffic patterns as found in conditions of the real transmission networks, based on general information on network impairment types and codec features.
• Description of an example of network simulation database containing the results of applying some typical and realistic transmission network scenarios and traffic patterns in a selected variety of environments.
• Description of how to produce a speech sample database using the setup given, and of the appropriate method to collect the corresponding subjective scores, for which an example of results, obtained for the purpose of ETSI STF 294, is given.
The setup and the process mentioned above are meant to be applied on speech samples. Nevertheless, although the resulting speech database is described in the present document (see clause 8), its production is outside the scope of the present document.
The setup, network simulation database and subjective test results as described in the document are applicable for:
• Simulation of network impairments in general (concerns the setup only).
• Evaluation of the contribution of background noise performance of terminals and networks to the perceived overall quality.
• Development of objective method for the quantification of background noise transmission performance (as it is developed in part 3 of the present document).
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