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The preamble is an introductory statement, a preliminary explanation. The term is particularly applied to the opening paragraph(s) of a statute, which recite historical facts which may be pertinent to the issue being discussed. It is often confused with the long title or the enacting formula of a law.

Contents 1 Legal effect 2 Other meanings 3 References 4 Further reading 5 See also

While preambles of legal texts may seem just like unimportant introductory matter, their words may have effects that may not have been foreseen by their drafters. For instance, it's on the basis of the preamble of the French Constitution, mentioning the solemn regard of the French Republic towards the principles set forth in the 1789 Declaration of the Rights of Man and of the Citizen that the Constitutional Council has declared certain laws to be unconstitutional (the first case being decision 71-44DC). In Canada as well, the preamble to the Constitution Act, 1867 was cited by the Supreme Court of Canada in the Provincial Judges Reference, to increase guarantees to judicial independence. In India, the Supreme Court frequently rules unconstitutional amendments which violate the Basic Structure of the Constitution, especially its Preamble. Furthermore, in the United States, broad constructionist judges have argued that the necessary-and-proper clause allows the U.S. federal government to act freely in any of the areas of the preamble to the United States Constitution, a point challenged repeatedly by their Originalist colleagues.

For this reason, the redaction of the preamble of the proposed European Constitution, in 2002, has caused much controversy because of the possible inclusion of references to the Christian heritage of Europe; could such a sentence be used in the future from a legal point of view? Likewise, in Australia in 1999, a referendum on whether to adopt a new preamble came with a promise that the preamble, if adopted, could not be enforceable by the courts, as some were concerned the preamble would be interpreted and applied by judges questionably.^[1]

In technology (particularly telecommunications), a preamble is the introduction to a message or header. In the case of Specific Area Message Encoding for the Emergency Alert System in the United States, the preamble is used as calibration, for example.

Preambles are used for vertical synchronization and Vertical interval timecode in television, and "sync characters" in Binary Synchronous Communications.

Other ways of calibration (and clock recovery) involve designing self-clocking signals and pilot signals.

See synchronization.

• This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain.

1. ^ Goldsworthy, Jeffrey. "The Preamble, Judicial Independence and Judicial Integrity." FORUM Constitutionnel (2000) 11:2.

• Frédéric Monera, L'idée de République et la jurisprudence du Conseil constitutionnel - Paris : L.G.D.J., 2004[1]-[2];

• Preamble to the United Nations Charter
• Preamble to the United States Constitution
• Preamble to the Canadian Charter of Rights and Freedoms
• Constitution of Fiji: Preamble