A garage sale for your mind

Sign in Subscribe

Topic

tech

A collection of 171 posts

Spectrum Analyzer [005]

I spent the better part of a week working on demodulation - but I haven't produced any sound yet. It's difficult to get straight, concise and understandable information on exactly how to filter and demodulate. So, I went back to working on the UI. You can

Spectrum Analyzer [004]

I put AM demodulation on hold for a moment and moved some code around so that I can better support demodulation later. In the new system (there's no point in dwelling on the particulars of the old system), the device read thread passes a newly received block of

Spectrum Analyzer [003]

My original, ill-conceived notion for drawing a waterfall display was to do a bunch of CGContextFillRect() each drawing a 1x1 rectangle. 1024 pixels wide * 250 pixels tall * redraw-rate = millions of 1x1 rectangles per second. Yeah, that didn't work at all. So, I made a second internal representation of

Spectrum Analyzer [002]

I've had current (red line), average (green fill) and max (blue fill) correctly drawing for a while, but it's taken some time to get the scale (in dBm) right. And I'm still not accounting for gain associated with the window function and the fft.

Operator -->

#include <stdlib.h> int main (int argc, char **argv) { int x = 10; while (x --> 0) printf("%d\n", x); return 0; }

The Spectral Man-a-lizer

I was asked what I am currently working on. "A spectrum analyzer," I replied. Blank stare. That's not uncommon though so I didn't think anything of it. Then there was a follow-up question: "A spectral man-a-lizer??" It was my turn for the

Imeem

Not that there is a want of reasons to dislike MySpace, but now they've gone and bought Imeem and promptly shut it down. Thanks for that. When will MySpace die? -- I had to share the gym today with like three other people. I know, you're

Maze Solver [3]

I got the C port of the core maze solver code done, tested, working and integrated with the OS X app. And the solution line is so much cleaner now.

Maze Solver [2]

I got ported the core maze solver code (everything except the gui code) to C. I haven't tested it yet; just got it compiling a few minutes ago. Anyway, it should run quite a bit faster since I can use fancy pre-allocated memory pools instead of sluggishly allocating

Maze Solver

UPDATE: Years ago, when I wrote this, I don't know why it didn't occur to me to link to the code. Here it is. My mind, for whatever it's worth, was being under-used, so I applied it to solving mazes. Check this action out.

Web Analytics