A sine wave consists of a single frequency only, and its spectrum is a single point . Theoretically, a sine wave exists over infinite time and never changes.
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Frequency spectrum of a signal is the range of frequencies contained by a signal .
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The audio frequency spectrum represents the range of frequencies that the human ear can interpret . Sound frequency is measured in Hertz (Hz) unit. This audible frequency range, in the average person at birth, is from 20Hz to 20000Hz, or 20 kHz. The audio frequency spectrum is also known as sound frequency spectrum.
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A spectrum analyzer reveals all the impurities of the signal as well as its general behavior . There are times, when a signal is mixed with other signals or modulated. Here, the spectrum of the signal readily shows the frequency of the signal of interest, and can help recover it.
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