Definition
Manchester encoding (biphase encoding) is a data encoding technique for transmitting data over a communication channel. Since this is a linear coding scheme, it ensures accurate and reliable data transfer between devices. Technically, Manchester code is a self-clocking binary code.
It merges binary and clock code into one stream, making synchronization between the sender and receiver seamless. Encoding involves transitions with each bit period. For instance, the ‘0’ bit means a high-low transition, meaning (1-0) is in the middle of the period.
On the other hand, the ‘1’ bit shows a low-high transition (0-1) within the middle of the bit period. Simply put, Manchester code generates a regular and consistent waveform that identifies errors as they occur. While it’s not a security tool, it helps to improve data integrity and reliability within communication systems.
Manchester Encoding Applications
- Magnetic cards: Old versions of magnetic stripe cards to encode data. The card reader scans the stripe-encoded data and forwards the payment request for processing.
- Fibre optic communication: Manchester encoding is used in some fibre optic communication systems or mechanisms for data transmission.
- Digital audio: Manchester encoding was widespread in traditional digital audio formats. However, as technology progressed, more efficient encoding methods replaced it.