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Title: | Estudo da qualidade da voz em sistemas de comunicação móvel através do CODEC EVS utilizando as métricas de qualidade P.862 e e-model |
Other Titles: | Voice quality assessment for communication systems with EVS CODEC using P.862 and e-model algorithms |
Authors: | Zegarra Rodríguez, Demóstenes Zegarra Rodríguez, Demóstenes Rosa, Renata Lopes Begazo, Dante Coaquira |
Keywords: | VoIP VoLTE MOS 3GPP Métricas de avaliação Qualidade de voz Codificadores de voz Qualidade de Experiência (QoE) EVS Redes móveis Voz sobre IP Voz sobre LTE Qualidade de Serviço (QoS) Protocolo RTP Protocolo SIP Protocolo H.323 Telefonia móvel Comunicação móvel Internet das coisas Voice over Internet Protocol (VoIP) Voice over LTE Long-Term Evolution (LTE) Mean Opinion Score (MOS) 3rd Generation Partnership Project (3GPP) Evaluation metrics Voice quality Voice coders Quality of Experience (QoE) Codec EVS Enhanced Voice Services (EVS) Mobile networks Quality of Service (QoS) Real-Time Transport Protocol Session Initiation Protocol H.323 Protocol Mobile telephony 5G Internet of things |
Issue Date: | 6-Sep-2023 |
Publisher: | Universidade Federal de Lavras |
Citation: | TORRES, A. Estudo da qualidade da voz em sistemas de comunicação móvel através do CODEC EVS utilizando as métricas de qualidade P.862 e e-model. 2023. 105 p. Dissertação (Mestrado em Ciência da Computação)–Universidade Federal de Lavras, Lavras, 2023. |
Abstract: | The evaluation of voice quality in telecommunications systems is of utmost importance to ensure effective and satisfactory communication for users. In this research, the algorithms of ITU-T Recommendation P.862 and ITU-T G.107 E-Model were used as standard references to analyze voice quality in communication systems. The methodology used aimed to ensure the accuracy and relevance of the results. Objective tests were conducted in mobile communication scenarios using the EVS (Enhanced Voice Services) and AMR-WB (Adaptive Multi-RateWideband) codecs. The objective of this study was to examine and suggest alternatives that assess user perception and control degradation through unbiased methods for perceptual analysis of audio signals’ quality. Prioritizing Quality of Experience (QoE), the results obtained were of great importance in improving the quality of voice communications in mobile communication systems. During the tests, voice signal encodings and decodings were performed using the EVS codec, both in interoperable mode with AMR-WB and in native EVS mode, using parameters such as DTX (Discontinuous Transmission) and -q. The results showed that voice transmission performance benefited from higher bit rates and the activation of specific transmission condition parameters. The use of parameters such as DTX and -q proved effective in improving voice transmission performance using the EVS codec. DTX is a feature that saves bandwidth by temporarily interrupting voice transmission when no speech is detected. The -q parameter refers to the use of a noise cancellation or silence suppression algorithm during voice quality measurement. The E-Model evaluates voice quality, considering factors such as available bandwidth, bit rate, packet loss, and network latency, also playing a fundamental role in determining the perceived quality by users. In conclusion, the research demonstrated the importance of evaluating voice quality in telecommunications systems and proposed solutions to enhance this quality in real-time communications using EVS and AMR-WB codecs. The results obtained are valuable for improving the quality of voice communications in mobile communication systems, ensuring a better experience for users. |
URI: | http://repositorio.ufla.br/jspui/handle/1/58325 |
Appears in Collections: | Ciência da Computação - Mestrado (Dissertações) |
Files in This Item:
File | Description | Size | Format | |
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DISSERTAÇÃO_Estudo da qualidade da voz em sistemas de comunicação móvel através do CODEC EVS utilizando as métricas de qualidade P.862 e e-mod.pdf | 2,1 MB | Adobe PDF | View/Open |
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