Amplitude spectrum vs frequency spectrum

In summary, a frequency spectrum is a plot of frequency versus power (usually in decibels) and can be split into an amplitude spectrum and a phase spectrum. Amplitude spectrum displays amplitude versus frequency, while power spectrum displays power versus frequency. Both terms are commonly used in engineering, although technically, "frequency spectrum" may be considered redundant. Additionally, there is still room for discussion and interpretation of these terms.
  • #1
whatphysics
29
2
What is the difference between amplitude spectrum and frequency spectrum? In signals and systems.
 
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  • #2
I THINK, not super sure, that frequency spectrum can be split up as an amplitude spectrum and a phase spectrum.
A frequency spectrum is a spectrum of complex numbers containing both amplitude (magnitude) and phase.
 
  • #3
whatphysics said:
What is the difference between amplitude spectrum and frequency spectrum? In signals and systems.
I think a frequency spectrum is a plot of frequency versus power (usually in decibels, in engineering). The power will be measured in a narrow passband which is swept across the spectrum,.
An amplitude spectrum is perhaps the same thing where amplitude, not power, is displayed.
Amplitude is proportional to the square root of power.
 
  • #4
Spectrum is something that can vary across a continuous range, or continuim.
See: https://en.wikipedia.org/wiki/Spectrum
A strict interpretation of the WIKI article would imply that "Frequency Spectrum" is a redundant phrase. Frequency Spectrum is, however, a commonly used engineering term for power versus frequency.

Following along with the above, is a WIKI article on Spectral Density: https://en.wikipedia.org/wiki/Spectral_density

Combining the concepts in the above article seems to lead to an "Amplitude Spectrum" being an 'amplitude versus time' relationship.

(Since the terms you asked about are rather ill-defined in general usage, there is still plenty of room for discussion/opinion/arguement!)
 

What is an amplitude spectrum?

An amplitude spectrum is a representation of the amplitudes of different frequencies present in a signal. It is a plot of the amplitude values against the corresponding frequencies.

What is a frequency spectrum?

A frequency spectrum is a representation of the frequencies present in a signal. It is a plot of the frequency values against the corresponding amplitudes.

What is the difference between amplitude spectrum and frequency spectrum?

The main difference between amplitude spectrum and frequency spectrum is the type of information they provide. While the amplitude spectrum shows the amplitudes of different frequencies, the frequency spectrum shows the frequencies present in a signal. Additionally, the amplitude spectrum is a plot of amplitude values against frequencies, whereas the frequency spectrum is a plot of frequency values against amplitudes.

How are amplitude and frequency related in a spectrum?

In a spectrum, the amplitude and frequency are inversely related. This means that as the frequency increases, the amplitude decreases and vice versa. This relationship is known as the amplitude-frequency relationship or the amplitude modulation.

What is the importance of amplitude and frequency spectra in signal processing?

The amplitude and frequency spectra are important in signal processing as they provide valuable information about the characteristics of a signal. They can help in identifying the different components present in a signal, detecting any anomalies or disturbances, and analyzing the overall quality of a signal. They are also used in various applications such as audio and image processing, communication systems, and medical diagnostics.

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