Re: Interesting reading about spread-spectrum, also for on-board designs

I've wondered that. And when they use a picture, it tends to be some ancient crufty Dip-package board.

I have rarely used wiggle traces to add delay, but the fake board images are full of them. And glowing traces. And vias without holes.

Hey, the electronic designers here could post pics of our prettiest real circuit boards.

The jitter pattern needs to create spectral spreading at high frequencies but not change averages at low frequencies. There might be some math involved.

Given the speed of measurable electrical nerve impulses, most sports should be impossible. Recognizing an image, one of millions, in milliseconds is even more improbable.

Something else is going on.

Standard issue in radar systems.

Take the FFT of the ss modulation and develop a pseudo-random sequence generator which shows no structure in the spectrum.

Joe Gwinn

In massive parallel: Fit, extrapolate, intercept.

Joe Gwinn

Even massive parallel has layers of logic, and chemistry is slow.

I suspect that the nerve impulses that we can detect electrically are not the real story. It is assumed that the pulse timing conveys the data, which makes no sense.

And has minimal low-frequency content.

Typically, yes.

Joe Gwinn

True, but it doesn't work like a digital computer.

Yes and no.

In the visual system, the key is a bunch of 2D "images" or maps, where items of interest and their location are coded as activity peaks. There are related maps where things like audio spectra are spread out into a 2D may that is not an image. Neurocomputing is a very large area, and filled with known-incomplete models that we don't yet know how to improve.

Pulse timing matters in some places, but not in others (where pulse rate is what matters. This for longer nerves; within much of the brain, it's action potentials that are communicated without pulses. And then there are various kinds of chemical messenger, some fast, some very slow ...

Joe Gwinn