laser communication

The aim of this project is to transmit analog sound from a commercial mp3 player digitally using a store-bought laser pointer as the transmitter. This will be achieved mainly by performing analog-digital conversions, and by using a digitally phase-locked loop (DPLL) to synchronize the clock signals on both the transmitter and the receiver. This pr
laser communication - schematic

oject was carried out in Jan 2012 - April 2012 as a group of 5 team-mates. Since the beginning of civilization, man has sought to communicate with each other over long distances. From the primitive usage of smoke signals to groundbreaking technologies of their time such as the telegraph and telephone, communication technology has seen rapid improvement and development in recent years into today`s 3G/4G cellular data networks and fiber-optic internet linkage which are commonly used by people worldwide. The ability to convert analog signals to digital ones for transmission has revolutionized the communication industry. Out of the various types of analog-digital transmissions, the Pulse Code Modulation (PCM) scheme is one of the most common. Apart from its usage in audio recording and compression, the PCM scheme is also used in Public Switch-Telephone Networks (PSTNs), whose primary objective is to use a modulation scheme to convert analog human voice signals into digital signals for transmission, and also to be able to convert the digital signals back into the original analog signal after reception. In comparison with analog transmissions, digital data transmissions have the significant advantage that discrete and finite levels of digital signals have intervals which cause it to be less vulnerable to distortions caused by ambient noise, which in turn make recovering the signal much easier. One way of transmitting digital data...

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