internal input signal

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• Input enhancement — is a concept in second language acquisition, coined by Michael Sharwood Smith, that is commonly used to signal methods that an instructor uses to make selected features of a second language more salient for learners in such a way as to facilitate …   Wikipedia

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• Loudspeaker — For other uses, see Loudspeaker (disambiguation). An inexpensive, low fidelity 3½ inch speaker, typically found in small radios …   Wikipedia

• Virtual ground — In the theory of electrical networks, a virtual ground ( or virtual earth) is a node of the circuit that is maintained at a steady reference potential, without being connected directly to the reference potential. In some cases the reference… …   Wikipedia