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DSD and Hardware Volume Control
#2
The general answer is that its not possible to apply DSP (volume, eq, etc) to native DSD bitstream format because of the way the format encodes the signal's amplitude as a varying density of 1-bit values (0 or 1). Thus to perform DSP on a bitstream it first must be converted to a format where the amplitude can be mathematically manipulated. 

IIRC, ESS Sabre DAC chips perform this conversion in the on-chip Asynchonous Sample Rate Converter (ASRC) component.

The Allo Katana and Audiophonics ESS 9028/38 based I2S DAC's both support Hardware volume control for DSD (DoP) by making use of the ASRC mode of the ESS chip.

I think a lot of ESS based USB DAC's also support hardware volume for DSD. I dunno what's going on with the USB Khadas board and why it apparently does not allow hardware volume for DSD(DoP). Very odd.
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RE: DSD and Hardware Volume Control - by Tim Curtis - 12-06-2019, 05:31 PM

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