Quote:
Originally Posted by geekmaster
This realtime FFT stuff is cool, but even back in the early apple-2 days, I did realtime spectrum plots (i.e. "waterfall display") by just measuring the zero-cross times to decide which bucket to increment and plot. The end result was much the same. We used it to analyze telephone signalling tones. No sines or cosines. No complex numbers. No bit reversals. But with no interrupts, every path through the code had to be padded to the same execution time for a constant time predictable run loop. 
So, depending on your application, you may be able to "cheat" like I did and still have an interesting frequency spectrum visual effect. Of course, we relied on analyzing simple waveforms with a mixture of only a few pure tones. But interestingly, it did show voice plots that looked a lot like those published in the books at the time. |
Yes indeed estimation can transcend crunching everytime, given the right lateral.
Most recently Beat estimation was a project that I read through the code of, the same with amplitude estimation, but the languages were c# and csound respectively, Once I squirm past the - taking longer to read than think about - stage perhaps some shortcuts could be managed.
As an aside:
It's good to know there are strong signal chops people out there, between you, Knc and my friend Will, I seriously fear for any theoretically modeled signals "Theoretical" status. For my part I'm just muddling through what docs I can muster and a few decent books, at the end of the day if I can do this stuff then anyone can.
Like knc says - people who can follow instructions - I would like to think I at least make that list
If I manage to get some data into Frequency space then happy days.