Glossary of terms
Below is a brief description of some of the technical terms found throughout this text. Experience has shown that although some of the terms may be familiar to many readers, they have often been misunderstood or misused. This glossary attempts to clarify the definitions of the terms, at least as used in British English.
Acausal filter
A filter applied, usually digitally, which has advanced knowledge of the signal arriving via delaying the main signal on which it is intended to act – effect before cause through prior knowledge of the cause. See Causal filter.
Active systems
Filters or loudspeaker systems, for example, where an external power source needs to be applied as well as the drive signal. A filter based on semiconductors ...
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