Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/58325
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)



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