The tangent line to a circle at a given point is the straight line that "just touches" the curve at that point.
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Tell a friend about us, add a link to this page, or visit the webmaster's page for free fun content. In an analog telephone conversation, the voice waves on both sides are modulating the voltage of the direct current loop connected to them by the telephone company.Modulate a Carrier Amplitude modulation (AM) is also widely used to alter a carrier wave to transmit data.

For example, in AM radio, the voltage (amplitude) of a carrier with a fixed center frequency (the station's channel) is varied (modulated) by the analog audio signal.AM is also used for digital data. In quadrature amplitude modulation (QAM), both amplitude and phase modulation are used to create different binary states for transmission (see QAM).
See modulation and carrier.Vary the AmplitudeIn AM modulation, the voltage (amplitude) of the carrier is varied by the incoming signal.
In this example, the modulating wave implies an analog signal.Digital Amplitude Shift Keying (ASK)For digital signals, amplitude shift keying (ASK) uses two voltage levels for 0 and 1 as in this example.

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