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A modulator is a device or circuit that performs modulation. A demodulator (sometimes detector) is a circuit that performs demodulation, the inverse of modulation. A modem (from modulator–demodulator), used in bidirectional communication, can perform both operations.
The demodulator, which is designed specifically for the symbol-set used by the modulator, determines the phase of the received signal and maps it back to the symbol it represents, thus recovering the original data. This requires the receiver to be able to compare the phase of the received signal to a reference signal – such a system is termed ...
Demodulation is the process of extracting the original information-bearing signal from a carrier wave. A demodulator is an electronic circuit (or computer program in a software-defined radio) that is used to recover the information content from the modulated carrier wave. [1] There are many types of modulation, and
By introducing a frequency offset between the carrier frequencies in the magnitude of at least the sum of the highest modulation frequencies employed by both transmitter, will eliminate generation of beat frequencies, e.g. highest modulation frequency is 2.4 kHz therefore the min. frequency offset between both carrier is 4.8 kHz (=2 x 2.4 kHz).
In the DSB-SC modulation, unlike in AM, the wave carrier is not transmitted; thus, much of the power is distributed between the side bands, which implies an increase of the cover in DSB-SC, compared to AM, for the same power use. DSB-SC transmission is a special case of double-sideband reduced carrier transmission. It is used for radio data systems
The phase modulation (φ(t), not shown) is a non-linearly increasing function from 0 to π /2 over the interval 0 < t < 16. The two amplitude-modulated components are known as the in-phase component (I, thin blue, decreasing) and the quadrature component (Q, thin red, increasing).
Delta-sigma modulation is related to delta modulation by the following steps (Figure 7): [11] §6. Start with a block diagram of a delta modulator/demodulator. The linearity property of integration, + = (+), makes it possible to move the integrator from the demodulator to be before the summation.
where is the energy per symbol in joules and ρ is the nominal spectral efficiency in (bits/s)/Hz. [2] / is also commonly used in the analysis of digital modulation schemes. The two quotients are related to each other according to the following: