Encoder: Difference between revisions

Revision as of 19:18, 7 October 2006

Revision as of 21:03, 7 October 2006

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{|align="right"

|[[Image:Encoder diagram.svg|thumb|240px212px|Circuit diagram of a single bit 4-to-2 line encoder]]

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|align="center"|

{|<div class="wikitablethumb"><div>

{| class="wikitable" style="margin:0;"

!colspan="6"|Truth table

!style="border-bottom:2px solid #000;"|A₃

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!style="border-bottom:2px solid #000;"|A₃₂

!style="border-bottom:2px solid #000;"|A₂₁

!style="border-bottom:2px solid #000;"|A₁₀

!style="border-bottom:2px solid #000; border-left:2px solid #000;"| F₁

!A₀

!style="border-leftbottom:2px solid #000;"| F₁₀

!F₀

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| 0 || 0 || 0 || 1 ||style="border-left:2px solid #000;"| 0 || 0

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| 1 || 0 || 0 || 0 ||style="border-left:2px solid #000;"| 1 || 1

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!colspan="6"{{caption|Truth table}}

</div></div>

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An '''encoder''' is a [[device]] used to change a [[Signalling (telecommunication)|signal]] (such as a [[bitstream]]) or [[data]] into a [[code]]. The code may serve any of a number of purposes such as compressing information for [[transmission (telecommunications)|transmission]] or [[Computer storage|storage]], [[encrypting]] or adding [[Redundancy (information theory)|redundancies]] to the input code, or translating from one code to another. This is usually done by means of a programmed [[algorithm]], especially if any part is [[digital]], while most [[analog (signal)|analog]] encoding is done with [[analog circuit|analog circuitry]].