Ask Difference

Noise vs. Signal — What's the Difference?

Edited by Tayyaba Rehman — By Maham Liaqat — Updated on May 9, 2024
Noise refers to unwanted or irrelevant information in a dataset, while signal denotes the meaningful and useful data.
Noise vs. Signal — What's the Difference?

Difference Between Noise and Signal

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Key Differences

Noise in data or communication systems represents interference or irrelevant data, complicating the extraction of useful information. On the other hand, signal refers to the actual information that is intended to be conveyed or analyzed.
In statistical analysis, noise can skew results and make data interpretation challenging, whereas signal provides the necessary data points that contribute to meaningful insights.
In electronic communication, noise is typically any unwanted electrical disturbance that affects the clarity of the signal, whereas the signal itself is the transmission of useful information through a medium.
Noise can be random or systematic errors that cloud or distort the message, while signal maintains the integrity of the original data or message intended by the source.
In the context of signal processing, reducing noise is crucial for enhancing the quality of the signal, thus improving the overall effectiveness of communication or data interpretation.
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Comparison Chart

Definition

Unwanted or irrelevant information or errors.
Meaningful or useful information or data.

Impact

Obscures or distorts the relevant data.
Carries essential information or data.

In Communication

Interferes with clear message transmission.
Facilitates accurate message transmission.

Reduction

Focuses on minimizing interference.
Focuses on enhancing clarity and relevance.

Example

Static in radio transmissions.
The voice or music transmitted by radio.

Compare with Definitions

Noise

Irrelevant or superfluous information.
The graph was full of noise, making it hard to identify the trend.

Signal

Information transmitted or conveyed.
The signal was clear and the team proceeded with the plan.

Noise

Statistical fluctuations not explained by the intended model.
The financial model failed to account for economic noise.

Signal

Electrical impulses conveying information.
The phone converts voice into electrical signals.

Noise

Background disturbances in experimental measurements.
The lab results had noise due to equipment malfunctions.

Signal

A detectable transmission or message.
The satellite received a signal from the spacecraft.

Noise

Unwanted disturbances within a signal pathway.
The recording had a lot of noise due to poor microphone quality.

Signal

An indicator or a sign used to convey information.
The firefighter used a signal to coordinate the rescue.

Noise

General cacophony in a busy environment.
The noise in the cafeteria made conversation difficult.

Signal

The data actually intended to be analyzed in a dataset.
Researchers focused on extracting signal from the noisy data.

Noise

Noise is unwanted sound considered unpleasant, loud or disruptive to hearing. From a physics standpoint, noise is indistinguishable from desired sound, as both are vibrations through a medium, such as air or water.

Signal

In signal processing, a signal is a function that conveys information about a phenomenon. In electronics and telecommunications, it refers to any time varying voltage, current, or electromagnetic wave that carries information.

Noise

A sound, especially one that is loud or unpleasant or that causes disturbance
Making a noise like a pig
What's that rustling noise outside the door?

Signal

An indicator, such as a gesture or colored light, that serves as a means of communication.

Noise

Irregular fluctuations that accompany a transmitted electrical signal but are not part of it and tend to obscure it
The enhancer can improve the video signal quality, reducing noise and increasing image sharpness

Signal

A message communicated by such means.

Noise

Talk about or make known publicly
You've discovered something that should not be noised about

Signal

Something that incites action
The peace treaty was the signal for celebration.

Noise

Make much noise
Rook, crow and jackdaw—noising loud

Signal

(Biology) A physical entity, such as a chemical or an electromagnetic wave, that activates a cell receptor and elicits a specific response.

Noise

Sound or a sound that is loud, unpleasant, unexpected, or undesired.

Signal

(Electronics) An impulse or fluctuating quantity, as of electrical voltage or light intensity, whose variations represent coded information.

Noise

Sound or a sound of any kind
The only noise was the wind in the pines.

Signal

(Computers) A sequence of digital values whose variations represent coded information.

Noise

A loud outcry or commotion
The noise of the mob.
A lot of noise over the new law.

Signal

The sound, image, or message transmitted or received by means of telecommunications.

Noise

(Physics) A disturbance, especially a random and persistent disturbance, that obscures or reduces the clarity of a signal.

Signal

Notably out of the ordinary
A signal feat.
A signal event.

Noise

(Computers) Irrelevant or meaningless data.

Signal

To make a signal to
I signaled the driver to proceed.

Noise

A complaint or protest.

Signal

To relate or make known by signals
They have signaled their willingness to negotiate.

Noise

Rumor; talk.

Signal

To cause an effect in (a cell) by the activation of a receptor, as by a neurotransmitter or hormone.

Noise

Noises Remarks or actions intended to convey a specific impression or to attract attention
"The U.S. is making appropriately friendly noises to the new Socialist Government" (Flora Lewis).

Signal

To make a signal or signals.

Noise

To spread the rumor or report of.

Signal

A sequence of states representing an encoded message in a communication channel.

Noise

(uncountable) Various sounds, usually unwanted or unpleasant.
He knew that it was trash day, when the garbage collectors made all the noise.

Signal

Any variation of a quantity or change in an entity over time that conveys information upon detection.

Noise

Any sound.
The sudden noise made everyone jump.
She crept up behind him not making a noise.

Signal

A sign made to give notice of some occurrence, command, or danger, or to indicate the start of a concerted action.

Noise

Sound or signal generated by random fluctuations.

Signal

An on-off light, semaphore, or other device used to give an indication to another person.

Noise

(technology) Any part of a signal or data that reduces the clarity, precision, or quality of the desired output.
Signal-to-noise ratio

Signal

(of a radio, TV, telephone, internet, etc.) An electromagnetic action, normally a voltage that is a function of time, that conveys the information of the radio or TV program or of communication with another party.
My mobile phone can't get a signal in the railway station.

Noise

Unwanted fuss or bustle; useless activity.

Signal

An action, change or process done to convey information and thus reduce uncertainty.

Noise

(genetics) The measured level of variation in gene expression among cells, regardless of source, within a supposedly identical population.

Signal

A token; an indication; a foreshadowing; a sign.

Noise

Rumour or complaint.
The problems with the new computer system are causing a lot of noise at Head Office.

Signal

Useful information, as opposed to noise.

Noise

(informal) Speech that is suggestive of an attitude or opinion.

Signal

A simple interprocess communication used to notify a process or thread of an occurrence.

Noise

(obsolete) Music, in general; a concert; also, a company of musicians; a band.

Signal

(biochemistry) A signalling interaction between cells

Noise

(music) A genre of rock music that uses static and other non-musical sounds, also influenced by art rock.

Signal

(ambitransitive) To indicate; to convey or communicate by a signal.
I signalled my acquiescence with a nod.
He whistled to signal that we should stop.

Noise

(intransitive) To make a noise; to sound.

Signal

(transitive) To communicate with (a person or system) by a signal.
Seeing the flames, he ran to the control room and signalled headquarters.

Noise

(transitive) To spread news of; to spread as rumor or gossip.

Signal

Standing above others in rank, importance, or achievement.
A signal exploit; a signal success; a signal act of benevolence

Noise

Sound of any kind.
The heavens turn about in a most rapid motion without noiseto us perceived.

Signal

A sign made for the purpose of giving notice to a person of some occurence, command, or danger; also, a sign, event, or watchword, which has been agreed upon as the occasion of concerted action.
All obeyedThe wonted signal and superior voiceOf this great potentate.

Noise

Especially, loud, confused, or senseless sound; clamor; din.

Signal

A token; an indication; a foreshadowing; a sign.
The weary sun . . . Gives signal of a goodly day to-morrow.
There was not the least signal of the calamity to be seen.

Noise

Loud or continuous talk; general talk or discussion; rumor; report.
What noise have we had about transplantation of diseases and transfusion of blood!
Socrates lived in Athens during the great plague which has made so much noise in all ages.

Signal

Noticeable; distinguished from what is ordinary; eminent; remarkable; memorable; as, a signal exploit; a signal service; a signal act of benevolence.
As signal now in low, dejected stateAs erst in highest, behold him where he lies.

Noise

Music, in general; a concert; also, a company of musicians; a band.
The king has his noise of gypsies.

Signal

Of or pertaining to signals, or the use of signals in conveying information; as, a signal flag or officer.

Noise

To sound; to make a noise.

Signal

To communicate by signals; as, to signal orders.

Noise

To spread by rumor or report.
All these sayings were noised abroad.

Signal

To notify by a signals; to make a signal or signals to; as, to signal a fleet to anchor.

Noise

To disturb with noise.

Signal

Any communication that encodes a message;
Signals from the boat suddenly stopped

Noise

Sound of any kind (especially unintelligible or dissonant sound);
He enjoyed the street noises
They heard indistinct noises of people talking
During the firework display that ended the gala the noise reached 98 decibels

Signal

Any incitement to action;
He awaited the signal to start
The victory was a signal for wild celebration

Noise

The auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience;
Modern music is just noise to me

Signal

An electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes

Noise

Electrical or acoustic activity that can disturb communication

Signal

Communicate silently and non-verbally by signals or signs;
He signed his disapproval with a dismissive hand gesture
The diner signaled the waiters to bring the menu

Noise

A loud outcry of protest or complaint;
The announcement of the election recount caused a lot of noise
Whatever it was he didn't like it and he was going to let them know by making as loud a noise as he could

Signal

Be a signal for or a symptom of;
These symptoms indicate a serious illness
Her behavior points to a severe neurosis
The economic indicators signal that the euro is undervalued

Noise

Incomprehensibility resulting from irrelevant information or meaningless facts or remarks;
All the noise in his speech concealed the fact that he didn't have anything to say

Signal

Notably out of the ordinary;
The year saw one signal triumph for the Labour party

Noise

The quality of lacking any predictable order or plan

Noise

Emit a noise

Common Curiosities

What is the primary goal when filtering noise in a dataset?

The primary goal is to enhance the clarity and relevance of the signal.

How can noise affect communication?

Noise can distort or obscure the clarity of a signal, making it difficult to understand the intended message.

How is signal different from noise in electronics?

Signal represents the actual data or information, whereas noise is the unwanted interference.

Can noise ever be completely eliminated in communication?

Complete elimination of noise is challenging, but it can be significantly reduced.

What is noise in data analysis?

Noise refers to random or irrelevant data points that do not contribute meaningful information to analysis.

Why is signal processing important?

It helps in the accurate transmission and reception of information by enhancing the signal.

What are common sources of noise in electronic devices?

Common sources include electromagnetic interference and component malfunctions.

What role does signal-to-noise ratio play?

It measures the level of desired signal compared to the level of background noise.

What techniques are used to reduce noise?

Techniques include signal processing filters, noise-cancelling algorithms, and improved hardware designs.

How does noise impact statistical analysis?

It can lead to inaccuracies in data interpretation and skew results.

What is an example of noise in a physical setting?

Background chatter in a crowded place can be considered noise.

How do you identify a signal in a noisy dataset?

Techniques like smoothing, averaging, and statistical modeling help identify the signal.

Can noise be useful in any scenario?

Sometimes, noise can be used to enhance security in data transmission or to mask sensitive signals.

What is an example of signal in a physical setting?

An alarm sounding in an emergency acts as a signal.

How does digital technology help in separating noise from signal?

Digital technology uses algorithms and digital filtering to isolate and enhance the signal.

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Author Spotlight

Written by
Maham Liaqat
Tayyaba Rehman is a distinguished writer, currently serving as a primary contributor to askdifference.com. As a researcher in semantics and etymology, Tayyaba's passion for the complexity of languages and their distinctions has found a perfect home on the platform. Tayyaba delves into the intricacies of language, distinguishing between commonly confused words and phrases, thereby providing clarity for readers worldwide.

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