| Good points. > The biggest problem though: the original requirement sounded like every output needs its individual "submix", so the complexity would quickly explode. You also cannot easily add e.g. delay compensation or digital EQ / FIR filter for room compensation if you later figure out this would be useful. You don't have these problems in the digital domain. I definitely missed this, that makes it totally untenable in analogue domain as anything other than a ridiculous art project or back when it was the only way to do it. The digital solution is much more flexible and once you get the pipeline running and understand how it all works, much easier to modify. I mention the analogue option only to offer an alternative, possibly more intuitive / easier to get started and experiment with option. Even in the simple mixer case, it's still probably not a viable solution for a real product, the digital stuff is so cheap now. > I don't think the analog solution is significantly easier to build. It's not just building it, but the learning curve. OP seems to have no electronics or DSP knowledge at all. Maybe it's my own background clouding my evaluation here, but bootstrapping even a passthrough ADC -> DSP/FPGA -> DAC pipeline to the point where it works sounds like a near-herculean task for someone without experience of either domain. For practical purposes it more or less requires custom PCBs which is its own learning curve, and even a basic FPGA is going to have non-trivial power, layout, and bitstream storage requirements to get right, which requires reading layout / power / app notes & datasheets. Then you need to learn the vendor's tooling and how to set up PLLs and design a clock scheme for the system, learn an HDL - which tends to be very unintuitive for software folks, with a steep learning curve of its own. Finally, you can eventually get to fooling around with your basic noop pipeline, but that is a loooong way from the word go to thinking about the problem you came in with. It won't be, relatively speaking, any good, but lashing up a simple additive mixer with a couple opamps on a breadboard will get you something to start iterating on. In the end it might not be any easier to get to a final solution, but personally at least I find this kind of iterative improvement much easier than brick wall after brick wall with little to show for it. Especially given they want an 8x8 matrix, frankly I think using existing OTS audio interfaces is the only practical solution unless OP is willing to dedicate a man-year of work to the project. > Don't forget that machine assembly is also super cheap now at least if you order in Asia, which removes almost all of the "soldering challenge" since usually only a hand full of big THT components like connectors will remain for you to solder manually. I almost mentioned this, and I've done it successfully a bunch of times, but it felt like a bit too much learning curve (lol compared to learning HDL). |