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In [[telecommunication]], a '''convolutional code''' is a type of [[error]]-correction [[code]] in which (a) each <i>m</i>-[[bit]] [[information]] symbol (each <i>m</i>-[[bit string]]) to be encoded is transformed into an <i>n</i>-bit symbol, where <i>m/n</i> is the code <i>rate</i> (<i>n</i> >= <i>m</i>) and (b) the transformation is a function of the last <i>k</i> information symbols, where <i>k</i> is the constraint length of the code.
Convolutional codes are often used to improve the performance of [[radio]] and [[satellite]] links.
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