 SIGNAL has been mainly developed in INRIAEspresso team since the 1980s, at the same time as similar programming languages, Esterel and Lustre.The SIGNAL language was first designed for signal processing applications in the beginning of the 1980s.It has been proposed to answer the demand of new domain-specific language for the design of signal processing applications, adopting a dataflow and block-diagram style with array and sliding window operators.