SIGNALBEHANDLING MED AVANCERAD BLUETOOTH-TEKNIK OCH OPTIMERADE OPERATIVSYSTEM : Optimera audiosystemet i ett avancerat inbyggt system med en fler-trådad programvara och synkroniserings mekanism

Sammanfattning: This study is about replacing an old bluetooth module with a new variant, namely the BM83 which is an integrated circuit that contains an internal DSP circuit, profiles and important functions such as noise reduction, acoustic echo removal and EQ filtering. The purpose of this study is to replace the old module with the BM83, as well as explore the internal DSP circuit in the BM83. The goal is to develop the audio system with a high performance bluetooth and explore the BM83's built-in DSP functions and its profiles to optimize sound quality. This study takes different methods and performs different experiments to test the ability of BM83 to replace RN52 in a DSP platform. In addition, it was proposed that an audiosystem should be managed in an operating system with the idea of optimizing data transfer by using some of new operating system mechanism methods. In this study, the differences between BM83 and RN52 were discussed in terms of their profiles, built-in CODEC and DSP algorithm.This study provides how SPP, A2DP and HFP can be used together when the BM83 is controlled by a DSP platform. In addition, it was tested how A2DP and HFP have a great importance in providing events that a DSP platform can decide on and how it chooses its source depending on these events. In addition, the data communication between the BM83 and an STM32F7 was tested via the SPP protocol, with the idea that any data would be sent and received via SPP without loss in data transmission. In conclusion, it was discussed what type of data communication is used between BM83 and an MCU in comparison between RN52 and how the built-in DSP circuit and itsprofiles are important for future research. This project was funded by the Hearing Research Foundation in project FA21-0017 and was carried out under the supervision of Amin Saremi.