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RE: No revolutions

Wadia was doing 64fs with a digital filter implemented by FPGA way back in 1988! That's the same rate as DSD. Krell and some others were doing the same by 1990.

By the time SACD launched in 1999, it was common to convert 44.1 KHz PCM at 256-512fs, even with R2R ladder DACs. That's 11.3 to 22.6 MHz, 4-8x higher than DSD at the time of SACD's introduction. A popular high end combination was the Burr-Brown DF1704 filter and PCM1704 DAC, which was released in 1998 and worked at 512fs for Redbook and 256fs for 96 KHz PCM.

And a decade ago, 768fs was becoming common, that's 33.87 MHz.

As released at 64fs in the SACD format, DSD was way behind the state of the art. It was limited by the storage inefficiency of the 1-bit format and trying to fit 8 channels (5.1 plus stereo) on DVD-based media. Quad DSD would have been more in line with the state of the art circa 2000, but it would have been stereo only.

These days, quad-DSD playback is still operating at a slower clock rate than modern PCM playback, but we're at a point of diminishing returns where increasing the clock rate further doesn't necessarily improve the filtering but may increase noise.

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