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RE: Tony - are you referring to the Acousence Mahler 6?

Posted by Tony Lauck (A) on July 7, 2012 at 15:04:57

In Reply to: Tony - are you referring to the Acousence Mahler 6? posted by Chris from Lafayette on July 7, 2012 at 14:47:00:

Yes, that's the recording.

Most "DSD" starts out in multi-bit format and this has been so for at least the past decade. There are some exceptions, e.g. the Grimm ADC. Similarly, most DSD DACs convert the input DSD to a multi-bit format, often at a higher master clock rate. That's the case with the SABRE chip in my Mytek Stereo192-DSD DAC.

There is some discussion in forums about PCM being processed one sample at a time, but that's really not correct, as all PCM formats require some form of low pass filter to smooth the output waveform and since these filters retain memory decoding these formats requires processing multiple samples "at once".

DSD is converted into PCM by low pass filtering. This will produce, for example 2822.4/24 PCM. Then, for example, 15 out of every 16 of these samples will simply be discarded, which results in 176.4/24. Of course, a more efficient implementation would not bother to calculate the samples that are about to be thrown out and some hardware implementations of the filter might not do a multiply by +1 or -1, rather just adding or subtracting the coefficient. (It would also be possible to process multiple bits of input with a single table lookup if desired, as would be familiar to any old-time program hackers.)

I am presently listening to my multi-bit recordings by upsampling them in my computer and sending DSD128 to my DAC. This seems to sound slightly better than playing them in their native format or upsampling to 176.4/24 or 192/24. I play my DSD tracks in the native 2822.4/1 format, but this will probably change if I get software that can do room EQ at 2822.4 as this will produce multi-bits and upsampling to DSD128 will preserve this resolution. (I am waiting for the needed software and hoping that it will run on my CPU.)


Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar

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