Hacker News Reader

Comment by deutronium | Hacker News Reader

I recently bought some FPAAs from Anadigm, specifically the 3.3V version: AN231E04-E2-QFNSP

Interestingly they use a switched-capacitor design, which means you can only input signals lower than the clock frequency used for switching the caps.

I had a look for continuous-time FPAAs but couldn't find any.

My goal is simply to make a guitar FX pedal with them, as they can alter gain, perform filtering such band-pass etc.

Potentially I could see it having lower latency than DSP, if anyone knows more about that, I'd be very curious.

View on HN

This may be completely not what you're looking for, but take a look at Cypress' PSOC devices. They have an interesting mix of analog and digital programmable blocks.

You can do digital control of analog circuits, PGA, digital pots, etc.

Just had a fun idea, you could use an LED to charge a rotating photoluminescent medium and then read out the intensity some rotation angle later, it be like a magnetic tape loop but have its own decay as well. Modulate the speed of rotation, the read angle and the intensity of the write.

http://www.identi-tape.com/photolum-tape.htm on the edge of a turn table

Heh, that's a really cool idea!

If you are interested, I did some research on extremely fast, lower power, and low noise filtering using FPGAs or CPLDs.

I am interested if you are willing to share!

https://news.ycombinator.com/item?id=8592292

Link to my reply. :)

Sure, that sounds cool! (I've got a cheap FPGA dev board that's got an ADC/DAC on, that I wouldn't mind putting to good use)

Most of the research work was targeting a specific development paltform, so I don't have good instructions for doing it generally. Here is the paper we based our research off of: http://www.eecg.toronto.edu/~johns/ece1371/papers/1993_lewis...

Here is my presentation poster which should explain the motivation and theory a little more clearly than the paper: https://www.ece.ucsb.edu/academics/undergrad/capstone/event-...

I graduated before we got it releasable, and haven't had much time with my job to finish up the project. I don't have more time to add to this explanation, but if you want more info or implementation help, feel free to email me: alecdibble at gmail dot com.

Reply on news.ycombinator.com