Joe's Tech Notes: Adding Sine Waves vs. Random Noise Signals
Автор: RocketRoberts
Загружено: 2024-02-26
Просмотров: 62
In this video we cover the basics of how sine waves (of the same frequency and phase) add, and also how random noise signals add. The goal is to show that when you add coherent signals (the sine waves) they add directly. When noise signals are added, the result DOES go up in value but NOT like it does with coherent signals. Two identical sine waves added will result in a 6 dB gain (relative to any one sine wave), whereas two random (uncorrelated) noise signals will result in a 3dB gain when they are added. If we have 2 sine waves (same frequency, phase and amplitude) and two noise signals (same RMS value is the sine waves, but random with respect to each other) and add them, a 3dB signal to noise ration is realized.
This video assumes the viewer has some experience with math and some electrical engineering topics (time domain, frequency domain, FFT, MATLAB, etc.) The same thing could be done using Excel, I opted for MATLAB for this video.
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