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biphase mark code (BMC)

The biphase mark code (BMC) is a line code used in transmission technology. It is similar to the differential Manchester coding

, from which it differs only slightly. In the two-phase mark code, the encoding of a digital "1" is accomplished by the state level changing in the middle of the bit time. If the level was "High" up to this time, then it changes to "Low"; if it was "Low", then it changes to "High". The coding of a digital "0" is different. In 0 encoding, the level of the transmitted bit does not remain unchanged until the end of the bit. The decisive factor is the time between the transitions from Hi to Lo or from Lo to Hi. In the case of the BMC code, if the logical state is, for example, a "1", the encoded signal level will jump from "1" to "0" with the clock

signal, whereas for a "0" it will not jump from "1" to "0" until after the clock signal. Thus, the state level remains constant for the total duration of the clock signal.

Biphase Mark Code (BMC)

Biphase Mark Code (BMC)

All line codes, including the biphase mark code, are optimized for specific signals and transmission media. For example, the biphase mark code is used for audio signals in the AES/EBU interface and in the S/PDIF interface used in home networks. In addition, the BMC code is used for encoding the magnetic stripes ofmagnetic cards.

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Englisch: biphase mark code - BMC
Updated at: 29.06.2019
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