What is A-weighted decibels (dBA, or dBa, or dB(a))? - Definition from WhatIs.com

Definition

A-weighted decibels (dBA, or dBa, or dB(a))

Part of the Computing fundamentals glossary:

A-weighted decibels, abbreviated dBA, or dBa, or dB(a), are an expression of the relative loudness of sounds in air as perceived by the human ear. In the A-weighted system, the decibel values of sounds at low frequencies are reduced, compared with unweighted decibels, in which no correction is made for audio frequency. This correction is made because the human ear is less sensitive at low audio frequencies, especially below 1000 Hz, than at high audio frequencies.

In computer systems, dBA is often used to specify the loudness of the fan used to cool the microprocessor and associated components. Typical dBA ratings are in the neighborhood of 25 dBA, representing 25 A-weighted decibels above the threshold of hearing. This is approximately the loudness of a person whispering in a quiet room.

This was last updated in March 2011
Contributor(s): Christoffer Holmstedt
Posted by: Margaret Rouse

Related Terms

Definitions

  • lossless and lossy compression

    - Lossless and lossy compression are terms that describe whether or not, in the compression of a file, all original data can be recovered when the file is uncompressed. (WhatIs.com)

  • integration

    - Integration is the act of bringing together smaller components into a single system that functions as one. (SearchCRM.com)

  • middleware

    - Middleware is a general term for software that connects separate, often complex, applications together. (SearchSOA.com)

Glossaries

  • Computing fundamentals

    - Terms related to computer fundamentals, including computer hardware definitions and words and phrases about software, operating systems, peripherals and troubleshooting.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question. Find an Answer.Powered by ITKnowledgeExchange.com

Ask An IT Question

Get answers from your peers on your most technical challenges

Ask Question

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.