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sampling.rst: replace "then" with a comma #119

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Expand Up @@ -10,7 +10,7 @@ In this chapter we introduce a concept called IQ sampling, a.k.a. complex sampli
Sampling Basics
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Before jumping into IQ sampling, let's discuss what sampling actually means. You may have encountered sampling without realizing it by recording audio with a microphone. The microphone is a transducer that converts sound waves into an electric signal (a voltage level). That electric signal is transformed by an analog-to-digital converter (ADC), producing a digital representation of the sound wave. To simplify, the microphone captures sound waves that are converted into electricity, and that electricity in turn is converted into numbers. The ADC acts as the bridge between the analog and digital domains. SDRs are surprisingly similar. Instead of a microphone, however, they utilize an antenna, although they also use ADCs. In both cases, the voltage level is sampled with an ADC. For SDRs, think radio waves in then numbers out.
Before jumping into IQ sampling, let's discuss what sampling actually means. You may have encountered sampling without realizing it by recording audio with a microphone. The microphone is a transducer that converts sound waves into an electric signal (a voltage level). That electric signal is transformed by an analog-to-digital converter (ADC), producing a digital representation of the sound wave. To simplify, the microphone captures sound waves that are converted into electricity, and that electricity in turn is converted into numbers. The ADC acts as the bridge between the analog and digital domains. SDRs are surprisingly similar. Instead of a microphone, however, they utilize an antenna, although they also use ADCs. In both cases, the voltage level is sampled with an ADC. For SDRs, think radio waves in, numbers out.

Whether we are dealing with audio or radio frequencies, we must sample if we want to capture, process, or save a signal digitally. Sampling might seem straightforward, but there is a lot to it. A more technical way to think of sampling a signal is grabbing values at moments in time and saving them digitally. Let's say we have some random function, :math:`S(t)`, which could represent anything, and it's a continuous function that we want to sample:

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