Nyquist's Law
Also called Nyquist's Theorem. Before sound as acoustic energy can be manipulated on a computer, it must first be converted to electrical energy (using a transducer such as a microphone) and then transformed through an analog-to-digital converter into a digital representation. This is all accomplished by sampling the continuous input waveform a certain number of times per second. The more often a wave is sampled the more accurate the digital representation. Nyquist's Law, named in 1933 after scientist Harry Nyquist, states that a sound must be sampled at least twice its highest analog frequency in order to extract all of the information from the bandwidth and accurately represent the original acoustic energy. Sampling at slightly more than twice the frequency will make up for imprecisions in filters and other components used for the conversion.
For example, human hearing ranges from 20Hz to 20,000Hz, so to imprint sound to a CD, the frequency must be sampled at a rate of 40,000Hz to reproduce the 20,000Hz signal. The CD standard is to sample 44,100 times per second, or 44.1 kHz.
-
1
private cloud project
Companies initiate private cloud projects to enable their IT infrastructure to become more capable of quickly adapting to continually evolving...
-
2
cloud backup
A cloud backup (cloud computer backup) refers to backing up data to a remote, cloud-based server. As a form of cloud storage, cloud backup data is...
-
-
3
mobile operating system
The mobile operating system is the software platform on top of which other programs, called application programs, can run on mobile devices.
-
4
big data
A catch-phrase, used to describe a massive volume of both structured and unstructured data that is so large that it's difficult to process with...
-
5
enterprise application
An enterprise application is the term used to describe applications -- or software -- that a business would use to assist the organization in...
-
6
private cloud
The phrase used to describe a cloud computing platform that is implemented within the corporate firewall, under the control of the IT department....
-
7
BYOD - bring your own device
A phrase that has become widely adopted to refer to mobile workers bringing their own mobile devices, such as smartphones, laptops and PDAs, into...
-
8
consumerization of IT
Consumerization of IT is a phrase used to describe the cycle of information technology (IT) emerging in the consumer market then spreading to...
-
9
CRM - Customer Relationship Management
Short for customer relationship management, CRM entails all aspects of interaction a company has with its customer, whether it be sales or service...
-
10
ERP - Enterprise Resource Planning
Short for enterprise resource planning, ERP is business management software that allows an organization to use a system of integrated applications...
Connect with Webopedia
-
-
Android Apps for Remote Computer Access
Remote access is useful when you need to collaborate with co-workers, help a friend with PC problems or grab files from your desktop.
