Design of a Duobinary encoder and decoder circuits for communication systems

This paper presents microcontroller based schematic circuit design of a complete duobinary encoder (duobinary code from binary bit) and duobinary decoder (binary from duobinary code) for data communication system. Binary code having two levels of bit sequence 1 and 0. On the other side Duobinary (DB) is a three-level code having 1, 0 and -1 levels. Using duobinary transmission instead of binary transmission, it can improve the system performance, bandwidth efficiency of output signal.