rvh
Senior Member

Fabulous! Thanks very much. Looks like this approach should solve my problem and allow me to migrate my T3.6 project (that needs variable DAC write times) to T4.1. Are you using the PJRC PT8211 board here? If so, do you...

Thanks for this. Do you happen to have examples, either audio or FFT displays, of the improved harmonic content and aliasing for this versus the BLIT or polyBLEP approaches?

Thanks agian Paul. I dusted off my oscilloscope to check the signals I was generating with that code, and discovered the DIN streams were still not setting higher bits. There must be a problem with my use of saw & m in...

I realized later that the reverse bit order might actually be enough to cause the result you showed due to the fact that the saw wav is incremented in steps of 160. Normally that would cause the lowest 5 bits to always...

Thanks Paul, all much appreciated (and sorry about the mix up with the other Paul). I rechecked the code above and realized it's sending the wrong bit order as well as having one value wrong in the 'and' array. So I've...

I had another read of the data sheet, and now think any WS edge might terminate the data input sequence for a channel. Even though that seems to contradict the statement that only the 'first 16 bit data is valid' - the...

Paul , here's a first go at a test program that sends 100 and 200Hz sawtooth waves to R and L channels respectively. I'm assuming the rudimentary timing diagram in the PT8211 data sheet is accurate where it shows...

p.s. How would you rate the audio quality (and background noise) you get from the PT8211 board vs a T3.6 DAC, when powered by USB (perhaps with an isolator)?

Thanks Paul, I too was thinking it might be a simple enough chip for this to work. It would be great if you could do a quick test for me, as indeed I don't have a PT8211 board (they seem not available in Australia, so I...

Yes, I've looked at Stefan's papers in the past. I was hoping to get around to trying out some of his ideas but haven't yet, and they're not trivial to implement if I remember correctly.