![]() | The topic of this article may not meet Wikipedia's
general notability guideline. (July 2016) |
Harvard biphase is a magnetic run length code for encoding magnetic tape. [1] It is one of the formats employed in forming the digital bits of logic one and logic zero, along with non-return-to-zero (NRZ) and bipolar-return-to-zero (RZ) formats. [2] Each bit in the Harvard biphase format undergoes change at its trailing edge and this transpires either from high to zero or zero to high independently of its value. [2]
Harvard biphase has previously been used for digital flight data recorder (FDR) where 12-bit words per second are recorded onto magnetic tape using Harvard biphase code. [3] The data are encoded in frames and each of these contains a snapshot of the avionics system in the aircraft. [4] For Harvard biphase, a phase transition in the middle of the bit cell indicates that the bit is 1. No transaction indicates that the bit is 0. There is also a phase transition at the start of each bit cell. [5] The ARINC 573 serves as a standard for FDRs that feature continuous data stream encoded in Harvard biphase. [6]
![]() | The topic of this article may not meet Wikipedia's
general notability guideline. (July 2016) |
Harvard biphase is a magnetic run length code for encoding magnetic tape. [1] It is one of the formats employed in forming the digital bits of logic one and logic zero, along with non-return-to-zero (NRZ) and bipolar-return-to-zero (RZ) formats. [2] Each bit in the Harvard biphase format undergoes change at its trailing edge and this transpires either from high to zero or zero to high independently of its value. [2]
Harvard biphase has previously been used for digital flight data recorder (FDR) where 12-bit words per second are recorded onto magnetic tape using Harvard biphase code. [3] The data are encoded in frames and each of these contains a snapshot of the avionics system in the aircraft. [4] For Harvard biphase, a phase transition in the middle of the bit cell indicates that the bit is 1. No transaction indicates that the bit is 0. There is also a phase transition at the start of each bit cell. [5] The ARINC 573 serves as a standard for FDRs that feature continuous data stream encoded in Harvard biphase. [6]