Yeni nesil akıllı cep telefonlarının ses kalitesi ve performans yönetimi

In today's global World, voice transmission has become an effective form of the communication. The expectation of the better sound quality is increased with the increasing importance of voice transmission. In order to measure sound quality, there are two basic methods: subjective and objective approach. The system which is introduced in this thesis is used to measure and improve the sound quality of the mobile-based device according to mean opinion score scale . The measurements were made according to audio codec bit rate and signal strength at the audio bandwidths which are narrowband, wideband and super wideband. This study is performed according to ITU-T Recommendation P.863. The results show that eighty percent, ninety percent and seventy seven point seventy seven percent sound quality improvement at downlink; ninety one point sixty six percent, eighty eight point eighty eight percent and eighty percent at uplink signal direction are achieved respectively for 2G, 3G and 4.5G mobile network.