- For a differential device such as an amplifier, a signal applied equally to both inputs. Also called common mode signal (1).
- The algebraic average of two signals applied to both ends of a balanced circuit, such as that of a differential amplifier. Also called common mode signal (2).
- synonym I signal
- Abbreviation of in-phase signal. In the NTSC system, one of the two color-difference signals. The other is the Q signal.
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