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RE: DSD Numbers.

From Sony's technical doc on the XA5400ES:
1. 8x oversampling digital filter for CD. Ensures accurate phase linearity and low noise.
2. Noise shaper for CD to further suppress audible noise. The noise shaper also puts out a 1-bit signal at 64 times the CD sampling frequency (1-bit/64 fs). Sixty-four times 44.1 kHz equals 2.8224 MHz, the same sampling frequency as Super Audio CD. In this way, the SA DAC presents both CD and SA-CD signals to the final converter stage in the identical 1-bit/64 fs form.
3. DSD filter for SA-CD, a digital filter that removes unwanted super high frequency noise by computing raw 1-bit digital data. By reducing noise in the digital domain, the DSD filter reduces the burden on analog filters and contributes to the uniformity among channels.
4. Multi-level DAC for both SA-CD and CD is a breakthrough design that combines the best attributes of 1-bit converters and multi-bit converters for sound that is exceptionally transparent, against a background that is phenomenally free from noise.


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