HansDR Posted October 31, 2013 Report Share Posted October 31, 2013 While going through hamster's Intro to FPGA & VHDL book (great resource BTW), I had a go at outputting 8-bit audio at 11 KHz through a sigma-delta DAC. It worked, but the audio quality was pretty poor. Yes, 8-bit @ 11 KHz audio is low-fi, but the same audio data is much less noisy when played through a computer's sound-card. The DAC itself was clocked at 32 MHz, which I think should be more than enough for decent quality output. I set myself the goal of improving quality to be similar to a sound-card (without increasing the number of bits or the input sample-rate). So far, I have managed to improve the quality by using a second-order sigma-delta DAC, but it still has crackling noise audible that shouldn't be there. Has anybody else experimented with sigma-delta DACs and 8-bit audio? If so, what kind quality did you get? I'm wondering if there's something wrong with the DAC, or if I should be doing something like digitally low-pass filtering the 8-bit @ 11 KHz audio data before passing it on to the DAC. Hans Link to comment Share on other sites More sharing options...
This topic is now archived and is closed to further replies.