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EE TIPS
What Is Correlation?
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| | A correlation works by progressively shifting the pattern (middle relatively to the signal (top). At each position, the two curves are multiplied term-by-term and summed, giving one point on the resulting correlation (bottom). |
Interested in learning about correlation and how to implement it in a digital signal processing system? In Circuit Cellar 299, Robert Lacoste addresses the subject without going overboard with complicated mathematics. He explains how a simple correlation calculation can drastically improve a system's performance. Lacoste writes:
Imagine a situation in which you have a noisy signal that includes replications of a given pattern. Each replication is more or less accurate, has a varying amplitude, and could be situated anywhere in the signal (see Figure 1). The pattern is known, even if it could have any shape. Also imagine that your boss or client asked you to find an algorithm that will locate each occurrence of the pattern in the signal and give an estimation of its amplitude. Not obvious, right? Well, it's actually quite easy. This is a classic situation for which you can apply a simple mathematical operation: correlation.
Before I define correlation and explain how to implement it in a DSP system, let's cover a few typical applications first. A radar system includes a transmitter and a receiver. The former sends out some pulses. Continue Reading
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ELECTRICAL ENGINEERING CHALLENGE
Sponsored by NetBurner, Administered by Circuit Cellar
Spot the schematic error for a chance to win! Put your technical skills to test. The June Electrical Engineering Challenge (sponsored by NetBurner) is now live.
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| | Find the error in the schematic and submit your answer via the online Submission Form |
THE CHALLENGE
Find the error in the schematic provided on the EE Challenge webpage. Submit your answer via the online submission form by the deadline of June 20, 2015 (2 PM EST).
PRIZES
Circuit Cellar will randomly select 2 prize winners from the pool of respondents who submit the correct answer. One person will receive a NetBurner MOD54415 LC Development Kit ($129 value). A second person will receive a Circuit Cellar Digital Subscription (1 year).
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Circuit Cellar #299
June 2015
Innovative Communications Projects | Net-Connected Automation System | DIY Power Line Interface Controller | RC Clock Tech | Cable Shielding Explained | The ChipWhisperer-Lite | Internet of Things Connectivity | Correlation Techniques & Tips | MCU-Based UV Intensity Tracking | The Future of Virtual Prototyping | And More
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