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  2. Augmentative and alternative communication - Wikipedia

    en.wikipedia.org/wiki/Augmentative_and...

    Aided communication methods can range from paper and pencil to communication books or boards to speech generating devices (SGDs) or devices producing written output. The elements of communication used in AAC include gestures, photographs, pictures, line drawings, letters and words, which can be used alone or in combination.

  3. Speech-generating device - Wikipedia

    en.wikipedia.org/wiki/Speech-generating_device

    Stephen Hawking (1942–2018), astrophysicist and prominent SGD user. Speech-generating devices (SGDs), also known as voice output communication aids, are electronic augmentative and alternative communication (AAC) systems used to supplement or replace speech or writing for individuals with severe speech impairments, enabling them to verbally communicate. [1]

  4. Bell Laboratories Layered Space-Time - Wikipedia

    en.wikipedia.org/wiki/Bell_Laboratories_Layered...

    Bell Laboratories Layer Space-Time (BLAST) is a transceiver architecture for offering spatial multiplexing over multiple-antenna wireless communication systems. Such systems have multiple antennas at both the transmitter and the receiver in an effort to exploit the many different paths between the two in a highly-scattering wireless environment.

  5. Duplex (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Duplex_(telecommunications)

    A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow for simultaneous communication in both directions between two connected parties or to provide a reverse path for the monitoring and remote adjustment ...

  6. Orthomode transducer - Wikipedia

    en.wikipedia.org/wiki/Orthomode_transducer

    Orthomode transducer, VSAT K u band Outdoor unit, includes feed horn, OMT, LNB and BUC Orthomode transducer (Portenseigne, France) Orthomode transducer, vertical and horizontal polarity Antenna side of OMT. An orthomode transducer (OMT) is a waveguide component that is commonly referred to as a polarisation duplexer.

  7. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    Public address systems consist of input sources (microphones, sound playback devices, etc.), amplifiers, control and monitoring equipment (e.g., LED indicator lights, VU meters, headphones), and loudspeakers. Usual input include microphones for speech or singing, direct inputs from musical instruments, and a recorded sound playback device. In ...

  8. Communications system - Wikipedia

    en.wikipedia.org/wiki/Communications_system

    A duplex communication system is a system composed of two connected parties or devices which can communicate with one another in both directions. The term duplex is used when describing communication between two parties or devices. Duplex systems are employed in nearly all communications networks, either to allow for a communication "two-way ...

  9. Telecommunications equipment - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_equipment

    Telecommunications equipment (also telecoms equipment or communications equipment) is a type of hardware which is used for the purposes of telecommunications.Since the 1990s the boundary between telecoms equipment and IT hardware has become blurred as a result of the growth of the internet and its increasing role in the transfer of telecoms data.