Не е налична версия с по-висока разделителна способност.
Phase-modulation.gif (600 × 600 пиксела, големина на файла: 806 КБ, MIME-тип: image/gif, зациклен, 59 кадъра, 3,5 сек)
Този файл е от Общомедия и може да се използва от други проекти.
Следва информация за файла, достъпна през оригиналната му описателна страница.
Резюме
ОписаниеPhase-modulation.gif
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 ))
Аз, носителят на авторските права над тази творба, я публикувам като обществено достояние. Това разрешение е в сила за целия свят. В някои държави това може да не е възможно от законодателна гледна точка; затова: Давам на всекиго правото да използва тази творба за всякакви цели, без никакви условия, освен ако такива условия съществуват по закон.
All amplitudes are at π/2 for the sake of aesthetics. The carrier signal usually has amplitude from [-1; 1].
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.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
Описания
Add a one-line explanation of what this file represents
Inverted modulation wave (was incorrect). Amplitude annotation (for scale). Time markers, horizontal axes. Reduced from 72 frames to 59 frames. File size down to 806KB.