[Brothers Grimm] MQA

[RMS Acoustics | Rob]

Hi Eelco,

Thanks for the additional info. Very useful article. 
If indeed they apply MLP (Meridian Lossless Packing) in combination with
what they describe ,  they create the necessary space for other information
like the low dynamic range HR info of the article.
My problem with the article was that they suggested to do it without
packing, just by putting the HF info in the <-140 dB range. In fact I still
wonder what the benefit is of this method over other methods of lossless
packing like MLP, FLAC, HDCD, DTS HD or Auro 3D over the full signal. I now
suppose it is the truncation of the HF info to a reduced dynamic range
instead of quantising the entire frequency range with the same 24 bit depth,
which gives the additional packing efficiency.

Best,

Rob
  

-----Original Message-----
From: Brothers [mailto:brothers-bounces at grimmaudio.nl] On Behalf Of Grimm |
Eelco
Sent: Wednesday, January 07, 2015 10:30 AM
To: brothers at grimmaudio.nl
Subject: Re: [Brothers Grimm] MQA

Hi guys,

Thanks for this wonderful discussion but there's people on the 'Brothers'
("Grimm Audio friends") list that don't speak Dutch. 

So in case they've used Google translate to follow the discussion: please
read the attached paper for an in depth primer about dither. 

And regarding Meridian: they are expert in digital audio procssing and have
demonstrated systems in the past for lossless packing and for using quasi
random noise in the 20-24 bits region simultaneously for dither and for
transporting >20 kHz audio data. Other examples of that technique are HDCD
and Auro 3D (which almost losslessly packs 9.1 channels in a 5.1 channels
PCM stream). MQA is the latest incarnation of this technique. I think it
makes sense and I'm happy to discuss this over a beer in Eindhoven :-)

Cheers,
Eelco