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> assume that the volume control on your operating system controls the DAC rather than doing the stupid thing of digital volume reduction. What would be the di

by mbell 14y ago

> assume that the volume control on your operating system controls the DAC rather than doing the stupid thing of digital volume reduction. What would be the difference? I've never seen a DAC with an analog volume control. Any DAC I've ever seen with volume control does so digitally, usually with toggable steps (+6DB, +12DB, etc) or rarely with a programmable gain. Either way the DAC is adjusting the incoming digital signal prior to conversion. It would be really strange to try to make an analog adjustment to the output before the reconstruction filter.

cnvogel 14y ago
First hit for a AC97 codec: AC ’97 SoundMAX® Codec AD1981B has an analog mixer stage between ADC/DAC and analog input/outputs. http://www.xilinx.com/products/boards/ml505/datasheets/87560554AD1981B_c.pdf http://www.xilinx.com/products/boards/ml505/datasheets/87560...
- mbell 14y ago
  That is a 10 year old codec, not a DAC, a DAC is only one part of a codec.
  - makomk 14y ago
    Computers generally tend to have full-blown codec chips with analog mixers in them rather than standalone DACs, though.
    - mbell 14y ago
      Depends on the model, cirrus codecs used in almost all mac's do all their mixing digitally for example.