Sony DVP-NS999ES - Manual (Page 36)

ES Series DVD-Video/CD/SA-CD Players; Version 3.0 Page 36
back to analog using delta sigma modulation at 25 MHz. The D/A converter
exhibits superb linearity, equivalent to 10-bit precision. So you get remarkably
accurate tracking on DVD, Super Audio CD and CD alike.
The Sony CXD9703 Servo DSP incorporates an on-board Delta Sigma
A/D and D/A converters for exceptional tracking accuracy.