by Barry Van Veen I am often asked, "What do careers in signal processing involve?" My answer is, "Almost anything." Signal processing has invaded every aspect of our daily lives. Medical diagnostics and treatment, transportation, weather forecasting, environmental monitoring, and personal electronics, e.g., cell phones, are a few of the everyday places we use signal processing. The […]
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Aliasing in Movies: Levitating Helicopters and Wheels Rotating Contrary to Motion
by Barry Van Veen Movies consist of individual images that are recorded or played back at a certain rate. Thus each pixel in the movie is sampled. A common frame rate for movies is 30 frames per second, which means that each pixel is sampled at 30 Hz. This is sufficiently fast that humans do […]
Learn Better: Science Shows You How to Succeed
Barry Van Veen The fields of neuroscience and cognitive psychology have now established very clear understandings of effective study habits. It turns out that widely used, passive techniques like highlighting and rereading a text (or re-watching a lecture video) are actually counterproductive. They may increase your familiarity, but do not improve your ability to apply […]
Concussion and AllSignalProcessing
This post is not about the recent movie on brain damage discovered in (American) football players by Dr. Bennet Omalu. It is about my own recent journey. I rarely share personal information over the internet. However, I want to give those of you who follow AllSignalProcessing.com some context for my reduced level of activity on the site over the past […]
Aliasing of Signals - Identity Theft in the Frequency Domain
by Barry Van Veen Earlier this year someone filed an income tax return using my identity. The topic of this blog post is aliasing, not tax fraud, although the concepts are similar. Aliasing in signal processing is when a sinusoid of one frequency takes on the appearance or identity of a different frequency sinusoid. […]
Estimation of the Amplitude and Phase of Sinusoids in Noise
by Barry Van Veen In the previous post we developed a method for estimating the amplitude and phase of sinusoids from data samples assuming the frequencies are known. This method applies to sinusoids with arbitrary frequencies. The approach we used to develop the estimator was to convert the amplitude and phase of each sinusoid into […]
