Phase-modulation

Autor/Urheber:

Potasmic

Shortlink:

https://dewiki.de/b/306c53

Quelle:

Wikimedia Commons

Größe:

600 x 600 Pixel (825557 Bytes)

Beschreibung:

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 ))

Kommentar zur Lizenz:

Public domainPublic domainfalsefalse

Ich, der Urheberrechtsinhaber dieses Werkes, veröffentliche es als gemeinfrei. Dies gilt weltweit. In manchen Staaten könnte dies rechtlich nicht möglich sein. Sofern dies der Fall ist: Ich gewähre jedem das bedingungslose Recht, dieses Werk für jedweden Zweck zu nutzen, es sei denn, Bedingungen sind gesetzlich erforderlich.

Lizenz:

Public domain

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