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  2. Riedel Communications - Wikipedia

    en.wikipedia.org/wiki/Riedel_Communications

    The products are used worldwide for broadcast, [14] [15] professional audio, event, [16] [17] [18] sports, [19] [20] theatre, universities [21] and security applications. • Rental service: Riedel provides radio and intercom services, event IT as well as fibre-based and wireless audio and video transmission systems.

  3. List of telephone switches - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone_switches

    The NX-1E was not a SPC switch, rather it was a conventional path controlled switching matrix with electronic processors (computers) replacing the control, route selection and translation (directory number to line ID) functions. NX2 (Family Small 90–1800 line CDO Xbar) NX2 (Original design 1959–1960) NX2A (Improved cabinets ~1962)

  4. DTMF - Wikipedia

    en.wikipedia.org/wiki/DTMF

    Autovon keypads were one of the few production units to include all 16 DTMF signals. The red keys in the fourth column produce the A, B, C, and D DTMF events. Before the development of DTMF, telephone numbers were dialed by users with a loop-disconnect (LD) signaling, more commonly known as pulse dialing (dial pulse, DP) in the United States.

  5. Orthogonal frequency-division multiplexing - Wikipedia

    en.wikipedia.org/wiki/Orthogonal_frequency...

    Then, the right hand side DFT/IDFT matrix and the th diagonal phase shift matrix in the diagonalization can be thought of the precoding to the input information symbol vector in the th sub vector channel, and all the vectorized subchannels become diagonal channels of discrete frequency components from the -point DFT of the original ISI channel ...

  6. MessageBird launches an 'omni-channel' Intercom competitor - AOL

    www.aol.com/news/messagebird-launches-omni...

    Following the launch of Inbox.ai in March -- its “Slack for external communications" -- Amsterdam-headquartered MessageBird is continuing to place big bets on a messaging-first future. Not ...

  7. Intercom - Wikipedia

    en.wikipedia.org/wiki/Intercom

    A butler uses an intercom on behalf of a lady. An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network. [1]

  8. Cooperative MIMO - Wikipedia

    en.wikipedia.org/wiki/Cooperative_MIMO

    The channel model from the BSs to the k th user is represented by an N k ×M channel matrix H k. Let s k denote the k th user transmit symbol vector. For user k, a linear transmit precoding matrix, W k, which transforms the data vector s k to the M ×1 transmitted vector W k × s k, is employed by the BSs.

  9. Matrix (protocol) - Wikipedia

    en.wikipedia.org/wiki/Matrix_(protocol)

    Matrix (sometimes stylized as [matrix]) is an open standard and communication protocol for real-time communication. [2] It aims to make real-time communication work seamlessly between different service providers, in the way that standard Simple Mail Transfer Protocol email currently does for store-and-forward email service, by allowing users with accounts at one communications service provider ...

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