DSD-compatible digital crossover

[steph_tsf]

Hello dear Digital Line Level lovers,

what would be the most qualitative way to build a crossover (multiamplification) taking a DSD signal as input ? Let's take as example the AK4383 stereo DAC equipping the Pioneer VSX-1012-K audio/video receiver. Pin 10 receives DSDL (left channel), pin 11 receives DSDR (right channel). Pin 9 receives DSDCLK (the clock). How to exploit those three pins for building an external stereo 3-way digital crossover ?

A T.I. PCM4204 chip may serve as DSD to 24-bit PCM converter.

Any other idea or other chip recommendation ?

Steph

[steph_tsf]

Found the SM5819 chip. It can handle all six DSD channels as input. It delivers three I2S (stereo) channels at the output. Looks ideal. Is it available ?

[alexcount]

I would ideally want to stay in the DSD format if possible, or alternatively 8x fs (352.8Khz, aka DXD). I believe basic manipulation of 1-bit formats is achievable, a quick google search brings up a number of papers related to delta sigma manipulation, the Eventide 2290 is proof 1-bit signals can be manipulated. The 2290 allowed finer time shifting than the lower sample rate PCM available at the time would have allowed, which would be beneficial in a crossover (phase perfect time shifting). The only options the DIY community could use to make a pure DSD or DXD crossover would be a FPGA or possibly a DSP, neither very easy for the amateur to implement or design, or using a device such as the ExaU2I and writing software to use the multiple discrete outputs, which should be much easier if not already obtainable.