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Noise reduction
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<p>Noise reduction is the process of removing <a href="/facts/Noise_(signal_processing)/JT3lGj8v">noise</a> from a <a href="/facts/Signal/41YqUJ8c">signal</a>. Noise reduction techniques exist for audio and images. Noise reduction <a href="/facts/Algorithm/fnl5NmRt">algorithms</a> may <a href="/facts/Distort/z8RJcwNy">distort</a> the signal to some degree. Noise rejection is the ability of a circuit to isolate an undesired signal component from the desired signal component, as with <a href="/facts/Common-mode_rejection_ratio/Q8NB2Be3">common-mode rejection ratio</a>. </p><p>All <a href="/facts/Signal_processing/Npaja6zb">signal processing</a> devices, both <a href="/facts/Analog_electronics/Bnlnfwwv">analog</a> and <a href="/facts/Digital_data/JChckAvr">digital</a>, have traits that make them susceptible to noise. Noise can be random with an even frequency distribution (<a href="/facts/White_noise/wJ0SR21n">white noise</a>), or frequency-dependent noise introduced by a device's mechanism or signal processing algorithms. </p><p>In <a href="/facts/Electronic_system/E4JhgISq">electronic systems</a>, a major type of noise is <i>hiss</i> created by random electron motion due to thermal agitation. These agitated electrons rapidly add and subtract from the output signal and thus create detectable <a href="/facts/Noise_(electronics)/Izbv38Rr">noise</a>. </p><p>In the case of <a href="/facts/Photographic_film/37aFq6ls">photographic film</a> and <a href="/facts/Magnetic_tape/wj6IDTR1">magnetic tape</a>, noise (both visible and audible) is introduced due to the grain structure of the medium. In photographic film, the size of the grains in the film determines the film's sensitivity, more sensitive film having larger-sized grains. In magnetic tape, the larger the grains of the magnetic particles (usually <a href="/facts/Ferric_oxide/vam0XoC5">ferric oxide</a> or <a href="/facts/Magnetite/SVxoGUs2">magnetite</a>), the more prone the medium is to noise. To compensate for this, larger areas of film or magnetic tape may be used to lower the noise to an acceptable level. </p>