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  • Electronic devices designed to amplify electrical signals. These amplifiers are typically an electronic unit with appropriate circuits intended to amplify the signals (either analog or digital) according their technical characteristics (e.g., intensity, bandwidth, input/output impedance); the amplifiers usually must perform their intended functions according to particular standards. Dedicated electric signal amplifiers are available for a variety of signals, including audio, radiofrequency, and video; some multichannel amplifiers are capable of simultaneous amplification of signals of different characteristics (e.g., audio and video).
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