File:Phase-modulation.gif
Summary
| Description |
English: This visualization describes phase modulation.
The wave displayed in red is the carrier signal, a sinusoidal wave with its frequency doubled base frequency. The wave displayed in blue is the modulating signal, also a sinusoidal wave, with its frequency tripled the base frequency. This modulating signal is positioned perpendicular to the carrier signal for the purpose of visualizing this type of modulation. The modulating signal (blue) determines the instantaneous phase of the carrier signal (red) of which current value will be the resulting signal. --- To generate this visualization, we first draw the carrier [t-2π; t+2π] and modulating signal [t; t+4π] perpendicular to each other; the modulating signal x-axis is aligned with the carrier's y-axis. We then draw a line from the modulating signal's value at time t and extend it until it intersects with the carrier signal. We then draw a line from that intersection until we intersect the reflector (45-degree backslash line) and extend it horizontally until we reach the output signal's buffer. The equation is g(x) = π/2 * sin( 2 * 2π * t + π/2 * sin( 3 * 2π * t )) |
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| Date | |||
| Source | Own work | ||
| Author | Potasmic | ||
| Permission (Reusing this file) |
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All amplitudes are at π/2 for the sake of aesthetics. The carrier signal usually has amplitude from [-1; 1].
This visualization's source code is available in Javascript at: https://github.com/khoin/PM-visualization.
Licensing
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
| The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
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