Designer's replies:
"Hi Soekris
That means is to use FPGA to convert file format to PCM then decode? This is the only way to do ? Can not be native decode the dsd format? Ok if yes , is possible to upsampling to DXD format first to decode (optional choice on firmware).
Thanks for your prompt reply."
"DSD is a one bit delta sigma modulated signal at 2.822, 5.644 Mbs or higher, afaik, you just feed it do a 50-70 Khz lowpass filter to get the analog signal back.
On a parallel DAC like mine you have to do an equivalent digital lowpass filter, then feed it in parallel form to the R-2R network, not really any conversion as such...."
"Hi Soekris
If I am nit misunderstood that means we just only need a digital filter to get analog signal to feed in the r2r dac only? If yes this is a extra benefit to all user .
Thanks"
"No, DSD is digital serial signal, a digital lowpass filter in the FPGA convert it to a PCM digital parallel signal. See Direct Stream Digital - Wikipedia, the free encyclopedia for more info on DSD."