The array n is the digital equivalent of t (i.e., time) in the typical sin(ωt) expression that we use in the analog domain. You can look in the “Variable Browser” to confirm that n is a one-dimensional array with a length of 100. We just created an array that begins at 0 and ends at 99. We’re going to use Scilab to create one cycle of a sine wave that has 100 samples per cycle.
Let’s explore this issue through an example.
#Scilab comments series#
This can lead to confusion for two reasons: 1) many different sample rates are used, and 2) sample-rate information is not contained within the series of amplitude values. Instead, we have individual amplitude values that must be interpreted according to the sample rate. In the digital domain, frequency loses its reference to an unchanging unit of time. Units of time are the same always and everywhere-e.g., 100 Hz (= 100 cycles per second) means the same thing in every engineering project. In the analog domain, frequency specifies the number of cycles with respect to time. For this article, we don’t need to concern ourselves with phase, and amplitude doesn’t really change when you move from analog to digital frequency, on the other hand, requires some attention. This is as true in the digital realm as it is in the analog realm, and consequently it is important to thoroughly understand the nature of a digitized sinusoid.īoth analog and digital sine waves have amplitude, frequency, and phase. In the world of signal processing, sinusoids are everywhere. Another advantage is that the Scilab interface is similar to the MATLAB interface, so if you have experience with MATLAB (maybe from your days as a student or an employee of a large company), Scilab should feel somewhat familiar. In my experience with Scilab, it is very capable and reasonably user-friendly. It turns out, though, that there is an alternative to MATLAB that is completely free called Scilab.
#Scilab comments software#
However, developing software of this quality is by no means inexpensive, and I wouldn’t be surprised to learn that the cost of a standard MATLAB license doesn’t fit within the budgetary constraints of numerous entrepreneurs, consultants, startups, and small engineering firms. I’ve done quite a bit of work with MATLAB over the years, and it is undoubtedly a powerful tool that can simplify and accelerate a wide variety of engineering tasks. This article discusses basic signal-processing tasks that can be performed using a free and open source alternative to MATLAB.
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