Wireless Transmission Of Audio Via Bluetooh

Abstract

Aim of the project is transmission of high quality audio using Bluetooth. The current wireless systems employ microwave system for transmission of audio. In these systems the voice quality suffers a great deal. We experience glitches and loss of data due to problems like interference and limited availability of spectrum. Interference can be caused by nearby electronic devices or someone else using the same frequency. Another drawback of the current systems is the absence of adequate security measures for transmission and reception of audio signals. Employing a security system is a difficult and costly measure. This project is based upon the transmission of high quality stereo audio which is achieved using Bluetooth technology. We can transfer simplex high quality stereo audio as well as duplex audio. The advantages of using Bluetooth instead of microwave systems are quite evident. Bluetooth operates in a dedicated frequency spectrum which eliminates the problems due to interference. It uses frequency hopping for security purposes and also for limiting the interference. High quality stereo audio is transferred from any device capable of Bluetooth to our Bluetooth module via the A2DP (Advanced Audio Distribution Profile) profile. It can also be used as a Bluetooth headset by using the HFP (Hands Free Profile) for two way communication. A mobile phone was used to pair with this device, the device switches between profiles depending upon the need of the mobile phone. If music was played on the phone, the device switched to A2DP but if a call was being received, it automatically switched to HFP.