non-return-to-zero [NRZ]

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(adj., n.) Describes a recording process that encodes ones and zeros as a fluctuation between two values. Each time a one occurs in a stream of digits, the value changes. The value does not change when a zero occurs. The value representing zero is not equal to the reference value, it is simply a different value than is used to represent a one. In the top example in the figure, the magnetized value changes only on ones. In the bottom example, both ones and zeros are represented by a change in the value.

non-return-to-zero recording