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Frequency domain
A way of representing a signal where the horizontal deflection is the frequency variable and the vertical deflection is the signals amplitude at that frequency.
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Method of representing a signal where the vertical deflection is the signals amplitude, and the horizontal deflection is the time variable.
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A modulation technique in which the carrier frequency is shifted by an amount proportional to the value of the modulating signal. The amplitude of the carrier signal remains constant. The information signal causes the carrier signal to increase or decrease its frequency based on the waveform of the information signal.
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The technique of varying the amplitude or wavelength of a carrier wave in direct proportion to the strength of the input signal while maintaining a constant frequency and phase.
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The most common and most important method that a telephone system in North America can use to sample a voice signal and convert that sample into an equivalent digital code. PCM is a digital modulation method that encodes a pulse amplitude modulated signal into a PCM signal.
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The decrease in power of a signal, light beam, or light wave, either absolutely or as a fraction of a reference value. The decrease usually occurs as a result of absorption, reflection, diffusion, scattering, deflection, or dispersion from an original level and usually not as a result of geometric spreading. The loss of signal strength and integrity on a cable because of the length of the cable.
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