### John Ehlers (@JohnEhlers)

Here is a super simple way to get the smoothing you want. Just smooth the pixels from left to right with an EMA. Then take that result and smooth it from right...

You may want to consider using an IIR filter. Adaptive smoothing filters are used by technical analysis traders in Futures and Stocks. You can Google such filter...

Marcin:I can only tell you my story, and that may help. I went back for my PhD after working in industry because I was gravitating toward management, and I really...

Chuck:t[0] is the current sample. t[1] is the last sample. So, in terms of samples, the difference is unity. Of course, time scales according to the sample...

Analog FM precedes DSP by years, and so does the math. I cannot find a reference, but I dubbed this process a Homodyne discriminator in my book. A Google search...

Sara: You already have plenty of inputs, and here is my take to "vulgarize" the topic.Electricity involves the relationship of charge and magnetism. These are...

I am concerned with stock market data. It is described as nonstationary pink noise. It can be reasonably represented as an exponential moving average of white...

Gardner's book costs over $1000 and is unavailable through my library. Do you have a more reasonable reference on the subject?

If you are only interested in an amplitude approximation, why not just use an equivalent IIR filter?

You may be getting some rounding errors that keep you from getting the brick wall response you are seeking. Try adding a simple two sample average that will absolutely...

Let's keep it simple and first assume your sample rate is unity (1 sample per second, for example). Frequency scales according to sample rate. The correct transfer...

Rick:I actually just found the answer to my problem. It turns out that micromodeler.com/dsp/# shows both the theoretical group delay as the rate change of angle...

Thanks Javier!I use a method similar to that of Castor-Perry, but is superior because it doesn't have the amplitude problems in the transfer response. In my method...

I was pushing poles and zeros around on micromodeler.com/dsp/# and found an interesting effect. First, I established a simple two pole lowpass filter. It's lag...

A little off topic, but here is a way to increase the resolution of your spectrum display: Steven Kay and Cedric Demeure, “The High-Resolution Spectrum Estimator...

The problem seems simple if only the sample rate is unknown. The ratio of the two tones is constant regardless of the error induced by the sample rate. So go...

I doubt if knowing the frequency difference would help you unless you have a priori knowledge of one of the tone frequencies.The highest resolution spectrum estimation...

Sorry to disagree, but you are off by at least an order of magnitude when the junction is conducting. Although the B+ voltage may be 5V, voltage across the junction...

I found an easy solution for SNR for my particular problem. In my case the noise tends to be broadband, and could have a pink noise spectrum. My solution is...

You have received a lot of similar inputs. Here is one that has a slightly different take that may be helpful in your thought process:Consider the real part as...

Spectrum inversion means converting a low frequency component to a high frequency component and vice-versa. You do this by multiplying your signal by a CW "carrier"...

Can't remember PI? Write out the first three odd digits twice, as: 113355 Now, divide the first three digits into the last three digits like you did in grade...

The Burg algorithm creates a poles-only transfer response that is optimally matched to the data presented. In essence, windowing has "no" meaning. The output...

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