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Encyclopedia > Spectrum analyzer

A spectrum analyzer is a device used to examine the spectral composition of some electrical, acoustic, or optical waveform. The article on electrical energy is located elsewhere. ... Acoustics is a branch of physics and is the study of sound, mechanical waves in gases, liquids, and solids. ... See also list of optical topics. ... Waveform quite literally means the shape and form of a signal, such as a wave moving across the surface of water, or the vibration of a plucked string. ...


Often, it measures the power spectrum. The power spectrum is a plot of the portion of a signals power (energy per unit time) falling within given frequency bins. ...


There are analogue and digital spectrum analyzers: For the Analog Science Fiction and Science Fact publication, see Astounding Magazine. ... A digital system is one that uses numbers, especially binary numbers, for input, processing, transmission, storage, or display, rather than a continuous spectrum of values (an analog system) or non-numeric symbols such as letters or icons. ...

  • An analogue spectrum analyzer uses either a variable bandpass filter whose mid-frequency is automatically tuned (shifted, swept) through the range of frequencies of which the spectrum is to be measured or a superheterodyne receiver where the local oscillator is swept through a range of frequencies.
  • A digital spectrum analyzer uses the Fast Fourier Transform (FFT), a mathematical process that transforms a waveform into the components of its frequency spectrum. As a result, computer programs can compute such transforms, and makes audio processing easier. FFTs have applications in much wider fields.

Some spectrum analyzers (such as Tektronix's family of "Real Time spectrum analyzers") use a hybrid technique where the incoming signal is first down-converted to a lower frequency using superheterodyne techniques and then analyzed using FFT techniques. The frequency axis of this symbolic diagram would be logarithmically scaled. ... A tuner is a device to adjust the resonant frequency of an antenna or transmission line to work most efficiently at one frequency or band of frequencies. ... The Super Heterodyne receiver (or to give it its full name, The Supersonic Heterodyne Receiver) was invented by Edwin Armstrong in 1918. ... The Superheterodyne receiver (or to give it its full name, The Supersonic Heterodyne Receiver – usually these days shortened to superhet) was invented by Edwin Armstrong in 1918. ... A fast Fourier transform (FFT) is an efficient algorithm to compute the discrete Fourier transform (DFT) and its inverse. ... In mathematics, physics and signal processing, the frequency spectrum is a representation of a signal or other function in terms of frequency (in the frequency domain). It is the projection of the function onto a set of sinusoidal basis functions. ... Audio signal processing, sometimes referred to as audio processing, is the processing of a representation of auditory signals, or sound. ... Tektronix is a United States corporation that is currently a major presence in the test, measurement, and measuring industry. ...


See also

Legend: γ = Gamma rays HX = Hard X-rays SX = Soft X-Rays EUV = Extreme ultraviolet NUV = Near ultraviolet Visible light NIR = Near infrared MIR = Moderate infrared FIR = Far infrared Radio waves: EHF = Extremely high frequency (Microwaves) SHF = Super high frequency (Microwaves) UHF = Ultrahigh frequency VHF = Very high frequency HF = High frequency... A spectrometer is an optical instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. ... The word spectrum (plural, spectra) has many uses: // Common nouns The Spectrum article explains why so many things are called by this name The spectrum of activity of a drug The political spectrum of opinion The economic spectrum The bipolar spectrum, in psychology The autistic spectrum, in psychology In the... A spectrogram of violin playing with linear frequency on the vertical axis and time on the horizontal axis. ...

External links

Non-electronic spectrum analyzers

Used to measure atomic particles.


  Results from FactBites:
 
Automation of scientific researches. Spectrum Analyzer Real-time FFT. Sound Frequency Sweep Generator. Acoustic audio ... (1125 words)
Spectrum analyzer processes the overlapped time series of samples of input signals for combination of the analysis high resolution both on time and on frequency simultaneously.
Spectrum analyzer has indicators of ADC input overload (clipping).
The OscilloMeter - Spectrum analyzer demo works with ADC of a sound card and is a fully functional copy of the program with one exception that input time is limited to 15 seconds after each "Start" button click.
Spectrum analyzer - Wikipedia, the free encyclopedia (241 words)
A spectrum analyzer is a device used to examine the spectral composition of some electrical, acoustic, or optical waveform.
An analog spectrum analyzer uses either a variable bandpass filter whose mid-frequency is automatically tuned (shifted, swept) through the range of frequencies of which the spectrum is to be measured or a superheterodyne receiver where the local oscillator is swept through a range of frequencies.
Some spectrum analyzers (such as Tektronix's family of "real-time spectrum analyzers") use a hybrid technique where the incoming signal is first down-converted to a lower frequency using superheterodyne techniques and then analyzed using FFT techniques.
  More results at FactBites »

 
 

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