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.
