What is an annotation?
Informally, an annotation is a note about some feature of a signal. On this web site, an annotation is a tag (label) that “points” to a specific sample of a digitized recording. Most PhysioBank databases include annotations for each record. In some cases, these may be reference annotations that have been independently reviewed by one or more (usually, two) human experts; in others, they may be machine annotations generated by automated signal-processing and analysis software. The documentation for each database indicates what types of annotations are available. Usually, annotations mark events that are localized in time (such as individual heart beats); sometimes, they are used to indicate persistent attributes (such as the beginning of a period of sleep). In recordings that contain two or more simultaneously recorded signals, an annotation can “point” to all signals at once, or to a specific signal.
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