Browse Definitions :
Definition

pulse amplitude modulation (PAM)

Pulse amplitude modulation (PAM) is the transmission of data by varying the amplitude s ( voltage or power levels) of the individual pulses in a regularly timed sequence of electrical or electromagnetic pulses. The number of possible pulse amplitudes can be infinite (in the case of analog PAM), but it is usually some power of two so that the resulting output signal can be digital . For example, in 4-level PAM there are 2^2  possible discrete pulse amplitudes; in 8-level PAM there are 2^3 possible discrete pulse amplitudes; and in 16-level PAM there are 2^4 possible discrete pulse amplitudes.

In some PAM systems, the amplitude of each pulse is directly proportional to the instantaneous modulating-signal amplitude at the time the pulse occurs. In other PAM systems, the amplitude of each pulse is inversely proportional to the instantaneous modulating-signal amplitude at the time the pulse occurs. In still other systems, the intensity of each pulse depends on some characteristic of the modulating signal other than its strength, such as its instantaneous frequency or phase .

PAM is only one of several forms of pulse modulation. Other methods include varying the durations (or widths), the frequencies, the positions, or the intervals of the individual pulses in a sequence.

This was last updated in March 2011

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • risk management

    Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings.

  • compliance as a service (CaaS)

    Compliance as a Service (CaaS) is a cloud service service level agreement (SLA) that specified how a managed service provider (...

  • data protection impact assessment (DPIA)

    A data protection impact assessment (DPIA) is a process designed to help organizations determine how data processing systems, ...

SearchSecurity

  • identity provider

    An identity provider is a system component that is able to provide an end user or internet-connected device with a single set of ...

  • firewall

    A firewall is software or firmware that enforces a set of rules about what data packets will be allowed to enter or leave a ...

  • encryption

    Encryption is the method by which information is converted into secret code that hides the information's true meaning. The ...

SearchHealthIT

SearchDisasterRecovery

  • business continuity plan (BCP)

    A business continuity plan (BCP) is a document that consists of the critical information an organization needs to continue ...

  • disaster recovery team

    A disaster recovery team is a group of individuals focused on planning, implementing, maintaining, auditing and testing an ...

  • cloud insurance

    Cloud insurance is any type of financial or data protection obtained by a cloud service provider. 

SearchStorage

Close