68 relations: AC power, Accelerometer, Acoustics, Analog-to-digital converter, Audio frequency, Band-pass filter, Band-stop filter, Bandwidth (signal processing), Battery pack, Central processing unit, Computer, Digital filter, Distortion, Duty cycle, Electric power, Electrical measurements, Electricity, Electromagnetic compatibility, Electromagnetic spectrum, Envelope detector, Fabry–Pérot interferometer, Fast Fourier transform, Feedback, Frequency, Frequency mixer, Frequency response, GSM frequency bands, Harmonic, Hearing range, Intermediate frequency, Intermodulation, Local oscillator, Low-pass filter, Measuring receiver, Monochromator, Noise (electronics), Noise floor, Nyquist rate, Optics, Oscilloscope, Periodogram, Photodiode, Preamplifier, Proximity sensor, Radio frequency, Radio spectrum scope, Radio-frequency sweep, Root mean square, Sampling (signal processing), Sine wave, ..., Sound card, Spectral density, Spectral leakage, Spectral music, Spectrogram, Spectrometer, Stationary-wave integrated Fourier transform spectrometry, Superheterodyne receiver, Telecommunication, Time domain, Total harmonic distortion, Total harmonic distortion analyzer, Transducer, UMTS frequency bands, Vector signal analyzer, Voltage-controlled oscillator, Waveform, Wireless. Expand index (18 more) »

## AC power

Power in an electric circuit is the rate of flow of energy past a given point of the circuit.

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## Accelerometer

An accelerometer is a device that measures proper acceleration.

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## Acoustics

Acoustics is the branch of physics that deals with the study of all mechanical waves in gases, liquids, and solids including topics such as vibration, sound, ultrasound and infrasound.

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## Analog-to-digital converter

In electronics, an analog-to-digital converter (ADC, A/D, or A-to-D) is a system that converts an analog signal, such as a sound picked up by a microphone or light entering a digital camera, into a digital signal.

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## Audio frequency

An audio frequency (abbreviation: AF) or audible frequency is characterized as a periodic vibration whose frequency is audible to the average human.

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## Band-pass filter

A band-pass filter, also bandpass filter or BPF, is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range.

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## Band-stop filter

In signal processing, a band-stop filter or band-rejection filter is a filter that passes most frequencies unaltered, but attenuates those in a specific range to very low levels.

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## Bandwidth (signal processing)

Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies.

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## Battery pack

A battery pack is a set of any number of (preferably) identical batteries or individual battery cells.

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## Central processing unit

A central processing unit (CPU) is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logical, control and input/output (I/O) operations specified by the instructions.

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## Computer

A computer is a device that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming.

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## Digital filter

In signal processing, a digital filter is a system that performs mathematical operations on a sampled, discrete-time signal to reduce or enhance certain aspects of that signal.

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## Distortion

Distortion is the alteration of the original shape (or other characteristic) of something.

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## Duty cycle

A duty cycle is the fraction of one period in which a signal or system is active.

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## Electric power

Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit.

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## Electrical measurements

Electrical measurements are the methods, devices and calculations used to measure electrical quantities.

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## Electricity

Electricity is the set of physical phenomena associated with the presence and motion of electric charge.

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## Electromagnetic compatibility

Electromagnetic compatibility (EMC) is the branch of electrical engineering concerned with the unintentional generation, propagation and reception of electromagnetic energy which may cause unwanted effects such as electromagnetic interference (EMI) or even physical damage in operational equipment.

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## Electromagnetic spectrum

The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.

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## Envelope detector

An envelope detector is an electronic circuit that takes a high-frequency signal as input and provides an output which is the envelope of the original signal.

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## Fabry–Pérot interferometer

In optics, a Fabry–Pérot interferometer (FPI) or etalon is typically made of a transparent plate with two reflecting surfaces, or two parallel highly reflecting mirrors.

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## Fast Fourier transform

A fast Fourier transform (FFT) is an algorithm that samples a signal over a period of time (or space) and divides it into its frequency components.

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## Feedback

Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop.

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## Frequency

Frequency is the number of occurrences of a repeating event per unit of time.

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## Frequency mixer

In electronics, a mixer, or frequency mixer, is a nonlinear electrical circuit that creates new frequencies from two signals applied to it.

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## Frequency response

Frequency response is the quantitative measure of the output spectrum of a system or device in response to a stimulus, and is used to characterize the dynamics of the system.

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## GSM frequency bands

GSM frequency bands or frequency ranges are the cellular frequencies designated by the ITU for the operation of GSM mobile phones and other mobile devices.

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## Harmonic

A harmonic is any member of the harmonic series, a divergent infinite series.

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## Hearing range

Hearing range describes the range of frequencies that can be heard by humans or other animals, though it can also refer to the range of levels.

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## Intermediate frequency

In communications and electronic engineering, an intermediate frequency (IF) is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception.

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## Intermodulation

Intermodulation (IM) or intermodulation distortion (IMD) is the amplitude modulation of signals containing two or more different frequencies, caused by nonlinearities in a system.

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## Local oscillator

In electronics, a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal.

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## Low-pass filter

A low-pass filter (LPF) is a filter that passes signals with a frequency lower than a certain cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency.

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## Measuring receiver

In telecommunication, a measuring receiver or measurement receiver is a calibrated laboratory-grade radio receiver designed to measure the characteristics of radio signals.

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## Monochromator

A monochromator is an optical device that transmits a mechanically selectable narrow band of wavelengths of light or other radiation chosen from a wider range of wavelengths available at the input.

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## Noise (electronics)

In electronics, noise is an unwanted disturbance in an electrical signal.

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## Noise floor

In signal theory, the noise floor is the measure of the signal created from the sum of all the noise sources and unwanted signals within a measurement system, where noise is defined as any signal other than the one being monitored.

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## Nyquist rate

In signal processing, the Nyquist rate, named after Harry Nyquist, is twice the bandwidth of a bandlimited function or a bandlimited channel.

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## Optics

Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it.

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## Oscilloscope

An oscilloscope, previously called an oscillograph, and informally known as a scope or o-scope, CRO (for cathode-ray oscilloscope), or DSO (for the more modern digital storage oscilloscope), is a type of electronic test instrument that allows observation of varying signal voltages, usually as a two-dimensional plot of one or more signals as a function of time.

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## Periodogram

In signal processing, a periodogram is an estimate of the spectral density of a signal. The term was coined by Arthur Schuster in 1898.

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## Photodiode

A photodiode is a semiconductor device that converts light into an electrical current.

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## Preamplifier

A preamplifier (preamp or "pre") is an electronic amplifier that converts a weak electrical signal into an output signal strong enough to be noise-tolerant and strong enough for further processing, or for sending to a power amplifier and a loudspeaker.

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## Proximity sensor

A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact.

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## Radio frequency

Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.

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## Radio spectrum scope

The radio spectrum scope (also radio panoramic receiver, panoramic adapter, pan receiver, pan adapter, panadapter, panoramic radio spectroscope, panoramoscope, panalyzor and band scope) was invented by Marcel Wallace and measures the magnitude of an input signal versus frequency within one or more radio bands - e.g. shortwave bands.

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## Radio-frequency sweep

Radio frequency sweep or "frequency sweep" or "RF sweep" refer to scanning a radio frequency band for detecting signals being transmitted there.

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## Root mean square

In statistics and its applications, the root mean square (abbreviated RMS or rms) is defined as the square root of the mean square (the arithmetic mean of the squares of a set of numbers).

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## Sampling (signal processing)

In signal processing, sampling is the reduction of a continuous-time signal to a discrete-time signal.

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## Sine wave

A sine wave or sinusoid is a mathematical curve that describes a smooth periodic oscillation.

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## Sound card

A sound card (also known as an audio card) is an internal expansion card that provides input and output of audio signals to and from a computer under control of computer programs.

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## Spectral density

The power spectrum S_(f) of a time series x(t) describes the distribution of power into frequency components composing that signal.

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## Spectral leakage

The Fourier transform of a function of time, s(t), is a complex-valued function of frequency, S(f), often referred to as a frequency spectrum.

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## Spectral music

Spectral music (or spectralism) is a compositional technique developed in the 1970s, using computer analysis of the quality of timbre in acoustic music or artificial timbres derived from synthesis.

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## Spectrogram

A spectrogram is a visual representation of the spectrum of frequencies of sound or other signal as they vary with time.

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## Spectrometer

A spectrometer is a scientific instrument used to separate and measure spectral components of a physical phenomenon.

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## Stationary-wave integrated Fourier transform spectrometry

Stationary-wave integrated Fourier transform spectrometry (SWIFTS) is an analytical technique used for measuring the distribution of light across an optical spectrum.

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## Superheterodyne receiver

A superheterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency.

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## Telecommunication

Telecommunication is the transmission of signs, signals, messages, words, writings, images and sounds or information of any nature by wire, radio, optical or other electromagnetic systems.

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## Time domain

Time domain is the analysis of mathematical functions, physical signals or time series of economic or environmental data, with respect to time.

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## Total harmonic distortion

The total harmonic distortion (THD) is a measurement of the harmonic distortion present in a signal and is defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency.

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## Total harmonic distortion analyzer

A total harmonic distortion analyzer calculates the total harmonic content of a sinewave with some distortion, expressed as total harmonic distortion (THD).

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## Transducer

A transducer is a device that converts energy from one form to another.

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## UMTS frequency bands

The UMTS frequency bands are radio frequencies used by third generation (3G) wireless Universal Mobile Telecommunications System networks.

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## Vector signal analyzer

A vector signal analyzer is an instrument that measures the magnitude and phase of the input signal at a single frequency within the IF bandwidth of the instrument.

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## Voltage-controlled oscillator

A microwave (12–18nbspGHz) voltage-controlled oscillator A voltage-controlled oscillator (VCO) is an electronic oscillator whose oscillation frequency is controlled by a voltage input.

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## Waveform

A waveform is the shape and form of a signal such as a wave moving in a physical medium or an abstract representation.

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## Wireless

Wireless communication, or sometimes simply wireless, is the transfer of information or power between two or more points that are not connected by an electrical conductor.

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## Redirects here:

DANL, Displayed average noise level, Spectral analyzer, Spectrum analyser, Video bandwidth (spectrum analysis).

## References

[1] https://en.wikipedia.org/wiki/Spectrum_analyzer