Practical applications for MLS include measuring impulse responses (e.g., of room reverberation or arrival times from towed sources in the ocean ). These sequences may be represented as coefficients of irreducible polynomials in a polynomial ring over Z/2Z. MLSs are spectrally flat, with the exception of a near-zero DC term. An MLS is also sometimes called an n-sequence or an m-sequence. They are bit sequences generated using maximal linear-feedback shift registers and are so called because they are periodic and reproduce every binary sequence (except the zero vector) that can be represented by the shift registers (i.e., for length- m registers they produce a sequence of length 2 m − 1). A maximum length sequence ( MLS) is a type of pseudorandom binary sequence.
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