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Figure 1 – uploaded by Bitrus Zirata Kamaunji
Figure 1 Analog Audio Voice Transmission between Voice Source and PC Analog data such as voice and video are often digitized to be able to use digital facilities Once analog data is converted to digital data, it can be transmitted directly using NRZ-L The digital data can be encoded as a digital signals and transmit with other techniques The digital data can be into analog signal using ASK, PSK, QAM etc Device for conversion is codec (coder-decoder). Two digital method of conversion (PCM, and DM), the most common technique for using digital signals to encode analog data is PCM. To transfer analog voice signals off a local loop to digital end office within the phone system, one uses a codec. In today’s busy world, where even every micro second is considered as very significant, almost all existing systems can be considered as rea time systems because time has become a very important factor fo1 execution of any system. The present communication systems such as wimax, Bluetooth are also providing real time communication but it has range problem as well as they are not very secure. The wireless technologies have gained lots of importance because of fast speed security and low cost. While we have attempted real-time audio & videc transmission system based on visible light communication but it has range limitations of just three meters. In this paper, we are trying tc transmit audio to a remote location. This system can be used to transmit recorded audio to remote computer in real time.
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