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Thread: DSD to dCS specification converter

  1. #1

    Join Date
    Jul 2011
    Posts
    4

    DSD to dCS specification converter

    Team, a company named dSC recently published a specification for direct
    dsd playback via existing pcm pipe line. This is not the same as converting the
    dsd data to pcm as the original dsd data is maintained for playback at the dac.
    Please read on to understand what they proposed!

    The audio player takes the real, genuine, raw DSD DFF file. It then
    extracts the raw DSD from the file. To send this raw DSD to the DAC,
    we have to use a carrier format that is known to work for existing
    operating systems, and has infrastructure commonly in use, to ensure
    the standard is open and quick to implement. To this end we looked at
    the available formats, and some quick sums bring us:

    DSD = 1 bit at 2.822400 MHz per channel
    CD = 16 bits at 44100Hz per channel
    16/176 = 16 bits at 176400Hz = 2.822400MBits a second per channel -
    the exact same number of bits as raw DSD.

    This means that we can pack the same data as either 16/176400 or
    1/2822400. If we then use a very common format, 24/176400 we have an
    extra 8 bits per sample we can use as an indicator (10101010) to the
    DAC that the data is DSD.

    The DAC receives these samples via the audio interface, and looks for
    the top 8 bits being 10101010 on both channels all the time. It can
    then discard these 8 bits, which leaves us with the same bits that
    were in the original DSD file. The DAC can now feed this raw DSD into
    it's DSD input.

    I have code to convert the dsd to packed pcm per the specification and
    was wondering if this feature can be added to DBPowerAmp. I can provide
    my code as needed and I can test the plug-in. The idea is to
    convert the dsdiff file to flac/wav so that "any" player could stream the dsd content
    to dacs. This would also allow for proper tags to be added to the resulting flac/wav file.

    You can find the dCS specification here:
    http://www.computeraudiophile.com/fi...over%20USB.pdf

    Thanks
    JR

  2. #2
    Administrator
    Join Date
    Apr 2002
    Posts
    42,837

    Re: DSD to dCS specification converter

    Are there any DACs which can accept this stream?

  3. #3

    Join Date
    Jul 2011
    Posts
    4

    Re: DSD to dCS specification converter

    Spoon, the Mytek 192 supports the spec, the dCS equipment is in progress and I'm working with two companies that are interested in the technology. There are two or three players that support the spec in real time.

    Thanks
    JR

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