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In telecommunications, a carrier signal, carrier wave, or just carrier, is a waveform (usually sinusoidal) that is modulated (modified) with an input signal for the purpose of conveying information.This carrier wave is usually a much higher frequency than the input signal.n the case of single-sideband modulation (SSB), the carrier is suppressed (and in some forms of SSB, eliminated). The carrier must be reintroduced at the receiver by a beat frequency oscillator (BFO).
Frequency modulation uses the instantaneous frequency of a modulating signal (voice, music, data, etc.) to directly vary the frequency of a carrier signal. Modulation index, Î², is used to describe the ratio of maximum frequency deviation of the carrier to the maximum frequency deviation of the modulating signal.The concept was pioneered by Edwin H. Armstrong in the late 1920s and patented in the early 1930s.ere, the maximum frequency (f max) causes a maximum deviation of 5*f max in the carrier. From the modulation index formula: Modulation Index (Î²) = 25. Here, the maximum frequency (f max) causes a maximum deviation of 25*f max in the carrier.