Communications signals can be sent either by analog signals or digital signals . There are analog communication systems and digital communication systems. For an analog signal, the signal is varied continuously with respect to the information. In a digital signal, the information is encoded as a set of discrete values (for example, a set of ones and zeros). During the propagation and reception, the information contained in analog signals will inevitably be degraded by undesirable physical noise . (The output of a transmitter is noise-free for all practical purposes.) Commonly, the noise in a communication system can be expressed as adding or subtracting from the desirable signal in a completely random way . This form of noise is called additive noise , with the understanding that the noise can be negative or positive at different instants of time. Noise that is not additive noise is a much more difficult situation to describe or analyze, and these other kinds of noise will be omitted here.
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Several fundamental objectives of the Nigerian Education Policy are directly threatened by the incidence of lateness to school. The goal of the education policy to inculcate the right type of values and attitudes for the survival of the individual and Nigerian society will not be attained if lateness to school is not curbed. This study will go a long way to illuminate this phenomenon and provide policy makers with facts that can be used to provide solutions.
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