It was determined that an increase in intelligence amplitude resulted in an AM signal with larger maximums and smaller minimums. It is helpful to have a mathematical relationship between the relative amplitude of the carrier and intelligence signals. The percentage modulation provides this, and it is a measure of the extent to which a carrier voltage is varied by intelligence. The percentage modulation is also referred to as modulation index or modulation factor, and they are symbolized by m. Figure 1 illustrates the two most common methods for determining percentage…
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