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| CATEGORIES ABOUT PSEUDORANDOM NOISE | |
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Although it seems to lack any definite Pattern , pseudorandom noise consists of a deterministic Sequence of Pulses that will repeat itself after its period. Each pulse in this sequence is known as a ''chip'' and the ''inverse'' of its period as ''chip rate''. In Cryptographic Device s, the pseudo-random noise pattern is determined by a Key and the repetition period can be very long, even millions of years. Pseudorandom noise is used in some Electronic Musical Instruments , either by itself or as an input to Subtractive Synthesis , and in many White Noise Machine s. In Spread-spectrum systems, Modulated Carrier transmissions appear as noise to any receiver that is: # not locked on the transmitter Frequencies ; or # incapable of Correlating a locally generated pseudorandom sequence with the received Signal . A pseudonoise code (PN code) is one that has a spectrum similar to a Random sequence of bits but is Deterministically generated. The most commonly used sequences in Direct-sequence Spread Spectrum systems are Maximal Length Sequence s, Gold Code s, Kasami Sequence s, and Barker Code s. [http://www.comblock.com/com1012.htm SEE ALSO
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