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  2. Communication channel - Wikipedia

    en.wikipedia.org/wiki/Communication_channel

    In spread-spectrum systems like 3G, interference also occurs inside the cell if non-orthogonal codes are used. A unicast channel is a channel that provides a unicast service, i.e. that sends data addressed to one specific user. An established phone call is an example.

  3. Tin can telephone - Wikipedia

    en.wikipedia.org/wiki/Tin_can_telephone

    A tin can phone is a type of acoustic (non-electrical) speech-transmitting device made up of two tin cans, paper cups or similarly shaped items attached to either end of a taut string or wire. It is a particular case of mechanical telephony , where sound (i.e., vibrations in the air) is converted into vibrations along a liquid or solid medium .

  4. Near-field communication - Wikipedia

    en.wikipedia.org/wiki/Near-field_communication

    Enables NFC-enabled devices to read information stored on inexpensive NFC tags embedded in labels or smart posters. NFC peer-to-peer Enables two NFC-enabled devices to communicate with each other to exchange information in an ad hoc fashion. NFC tags are passive data stores which can be read, and under some circumstances written to, by an NFC ...

  5. Telephone - Wikipedia

    en.wikipedia.org/wiki/Telephone

    A mobile phone or cellphone or hand phone is a handheld telephone which connects via radio transmissions to a cellular telephone network. The cellular network consists of a network of ground based transmitter/receiver stations with antennas – which are usually located on towers or on buildings – and infrastructure connecting to the global ...

  6. Bubble memory - Wikipedia

    en.wikipedia.org/wiki/Bubble_memory

    The next problem was to make them move to the proper location where they could be read back out: twistor was a wire and there was only one place to go, but in a 2D sheet things would not be so easy. Unlike the original experiments, the garnet did not constrain the bubbles to move only in one direction, but its bubble properties were too ...

  7. Wireless power transfer - Wikipedia

    en.wikipedia.org/wiki/Wireless_power_transfer

    When the phone is set on the pad, a coil in the pad creates a magnetic field [1] which induces a current in another coil, in the phone, charging its battery. Generic block diagram of a wireless power system. Wireless power transfer (WPT; also wireless energy transmission or WET) is the transmission of electrical energy without wires as a ...

  8. [467] [468] Mirror writing and reading letters or words backwards are behaviors seen in many children (dyslexic or not) as they learn to read and write. [ 467 ] [ 468 ] Dyslexia is a neurodevelopmental disorder of people who have at least average intelligence and who have difficulty in reading and writing that is not otherwise explained by low ...

  9. Cellular automaton - Wikipedia

    en.wikipedia.org/wiki/Cellular_automaton

    A cellular automaton consists of a regular grid of cells, each in one of a finite number of states, such as on and off (in contrast to a coupled map lattice). The grid can be in any finite number of dimensions. For each cell, a set of cells called its neighborhood is defined relative to the specified cell.

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