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  2. Differential coding - Wikipedia

    en.wikipedia.org/wiki/Differential_coding

    A block diagram representation of a differential encoder. Note that the output is dependent on both the current and previous register state. Another type of differential decoder. A method illustrated above can deal with a data stream inversion (it is called 180° ambiguity).

  3. Armstrong phase modulator - Wikipedia

    en.wikipedia.org/wiki/Armstrong_phase_modulator

    In the Armstrong method, the audio signal and the radio frequency carrier signal are applied to the balanced modulator to generate a double sideband suppressed carrier signal. The phase of this output signal is then shifted 90 degrees with respect to the original carrier. The balanced modulator output can either lead or lag the carrier's phase.

  4. NE612 - Wikipedia

    en.wikipedia.org/wiki/NE612

    Block diagram. The NE612 is an integrated circuit for processing of signals, such as in the transmission of radio signals. It consists of a oscillator and a mixer. [1] It can handle signal frequencies of up to 500 MHz and local oscillator frequencies of up to 200 MHz.

  5. Direct-conversion receiver - Wikipedia

    en.wikipedia.org/wiki/Direct-conversion_receiver

    A block diagram of the direct conversion receiver. The conversion of the modulated signal to baseband is done in a single frequency conversion. This avoids the complexity of the superheterodyne's two (or more) frequency conversions, IF stage(s), and image rejection issues.

  6. Phase detector - Wikipedia

    en.wikipedia.org/wiki/Phase_detector

    An example CMOS digital phase frequency detector. Inputs are R and V while the outputs U p and D n feed to a charge pump. A phase detector suitable for square wave signals can be made from an exclusive-OR (XOR) logic gate. When the two signals being compared are completely in-phase, the XOR gate's output will have a constant level of zero.

  7. In-phase and quadrature components - Wikipedia

    en.wikipedia.org/wiki/In-phase_and_quadrature...

    The phase modulation (φ(t), not shown) is a non-linearly increasing function from 0 to π /2 over the interval 0 < t < 16. The two amplitude-modulated components are known as the in-phase component (I, thin blue, decreasing) and the quadrature component (Q, thin red, increasing).

  8. Eye pattern - Wikipedia

    en.wikipedia.org/wiki/Eye_pattern

    In telecommunications, an eye pattern, also known as an eye diagram, is an oscilloscope display in which a digital signal from a receiver is repetitively sampled and applied to the vertical input (y-axis), while the data rate is used to trigger the horizontal sweep (x-axis). It is so called because, for several types of coding, the pattern ...

  9. Model-based design - Wikipedia

    en.wikipedia.org/wiki/Model-based_design

    First-principles based modeling is based on creating a block diagram model that implements known differential-algebraic equations governing plant dynamics. A type of first-principles based modeling is physical modeling, where a model consists in connected blocks that represent the physical elements of the actual plant.

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