May 2010
Beginner to intermediate
264 pages
7h 26m
English
Content preview from Digital Signal Processing 101Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CHAPTER 4Frequency Response
When we have a sampled digital signal, we are ready to perform digital signal processing on this signal. In the preceding chapter, we briefly touched on representing the signal in the frequency domain. Usually, our goal is to modify the signal’s frequency representation. This is normally performed using a filtering function. This is probably the most fundamental of DSP functions. In the previous example of the telephone system, we talked about sampling the voice signal at 8 kHz. Let’s say we want to build an automated system to detect touch tones (on a touch-tone phone, whenever you press a number key, the phone creates two specific tones or frequencies in the audio signal band; i.e., what you hear when pressing the ...
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