Browse Definitions:
Definition

slow-scan television (SSTV)

Slow-scan television (SSTV) is a mode of video communications in which a sequence of fixed images is sent and received at intervals of several seconds. SSTV is practical for transmission of images over plain old telephone service ( POTS ) lines and in other applications where the available bandwidth is severely limited. The bandwidth of an SSTV signal is comparable to that of a voice signal in analog telephone or wireless communications (3 KHz or less).

SSTV was used to send the first video images back to earth from the Apollo 11 moon mission. SSTV is sometimes used in medical imaging, security systems, and in the remote monitoring of hazardous equipment or natural phenomena. Amateur radio operators occasionally use SSTV in their communications. Most SSTV communication is done in grayscale . However, color images can be sent and received in SSTV mode with some sacrifice in resolution , or a longer interval between images, or both.

An SSTV signal consists of a rapid sequence of audio tones having variable pitch. When heard directly, it has a characteristic warbling sound. An SSTV communications station consists of a telephone connection or radio transceiver, a personal computer, a program called a scan converter , and a video camera. The scan converter employs two data converters, one for receiving (by means of the microphone or line input port) and the other for transmitting (by means of the speaker or line output port). The scan converter changes incoming SSTV tones into images suitable for viewing on the computer. These images can be viewed in real time , stored individually, or stored as a sequence of video files. The scan converter also changes video data from the camera to audio tones that are fed to the telephone set or the microphone input of the radio transceiver.

>> Stay up to date by receiving the latest IT term daily. Simply check "Word of the Day" to register.

This was last updated in March 2011

Continue Reading About slow-scan television (SSTV)

Join the conversation

1 comment

Send me notifications when other members comment.

By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Please create a username to comment.

Why no word about the Inventors of SSTV? This was done by radioamateurs in the 1958 ( Copthorne Macdonald 1958 - USA). Using a Radar tube.
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • smart contract

    A smart contract, also known as a cryptocontract, is a computer program that directly controls the transfer of digital currencies...

  • risk map (risk heat map)

    A risk map, also known as a risk heat map, is a data visualization tool for communicating specific risks an organization faces. A...

  • internal audit (IA)

    An internal audit (IA) is an organizational initiative to monitor and analyze its own business operations in order to determine ...

SearchSecurity

  • evil maid attack

    An evil maid attack is a security exploit that targets a computing device that has been shut down and left unattended.  An evil ...

  • Common Body of Knowledge (CBK)

    In security, Common Body of Knowledge (CBK) is a comprehensive framework of all the relevant subjects a security professional ...

  • rootkit

    A rootkit is a program or, more often, a collection of software tools that gives a threat actor remote access to and control over...

SearchHealthIT

  • value-based healthcare

    Value-based healthcare, also known as value-based care, is a payment model that rewards healthcare providers for providing ...

  • health informatics

    Health informatics is the practice of acquiring, studying and managing health data and applying medical concepts in conjunction ...

  • clinical trial

    A clinical trial, also known as a clinical research study, is a protocol to evaluate the effects and efficacy of experimental ...

SearchDisasterRecovery

  • crisis communication

    Crisis communication is a method of corresponding with people and organizations during a disruptive event to provide them with ...

  • Zerto

    Zerto is a storage software vendor that specializes in enterprise-class business continuity and disaster recovery in virtual and ...

  • crisis management plan (CMP)

    A crisis management plan (CMP) is a document that outlines the processes an organization will use to respond to a critical ...

SearchStorage

  • cache memory

    Cache memory, also called CPU memory, is high-speed static random access memory (SRAM) that a computer microprocessor can access ...

  • RAID 10 (RAID 1+0)

    RAID 10, also known as RAID 1+0, is a RAID configuration that combines disk mirroring and disk striping to protect data.

  • Red Hat OpenStack Platform

    Red Hat OpenStack Platform is a commercially supported distribution of open source OpenStack software designed to build and ...

SearchSolidStateStorage

  • hybrid hard disk drive (HDD)

    A hybrid hard disk drive is an electromechanical spinning hard disk that contains some amount of NAND Flash memory.

Close