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More => Old Versions => JRiver Media Center 23 for Windows => Topic started by: PMA! on January 01, 2018, 01:33:56 pm

Title: Convolvers and Samplerate
Post by: PMA! on January 01, 2018, 01:33:56 pm

Hi!
I have a somewhat complex question, to me at least. Here I go:

I plan on using JRiver for playing all audio in my custom, 8 channel stereo setup. The DAC has 8 channels, and I will use a program called Audiolense to make convolvers that correct time/phase and EQ for all channels.

Now, when I generat a filter in audiolense, I am told to choose samplerate. However, in the help-file of Audiolense I am told that JRiver will resample the convolver to the correct samplerate. We are getting closer to the question:

I am looking into buying a new soundcard/DAC that has options for either a DSD compatible DAC or 192kHz compatible DAC. Will JRiver be able to sample my convolver to DSD samplerates or is there some sort of bottleneck anywhere?

Title: Re: Convolvers and Samplerate
Post by: Hendrik on January 01, 2018, 03:14:28 pm

We don't support processing DSD audio at all, so you can't convolve DSD without converting it to PCM first.

Title: Re: Convolvers and Samplerate
Post by: kr4 on January 01, 2018, 04:30:15 pm

And this is not unusual.  AFAIK, Audiolense and comparable only work with PCM.

Title: Re: Convolvers and Samplerate
Post by: PMA! on January 02, 2018, 01:24:27 pm

What if I asked the same question about DXD?

Title: Re: Convolvers and Samplerate
Post by: Awesome Donkey on January 02, 2018, 02:03:07 pm

Huh, that's a good question actually since DXD is PCM at 24-bit/352.8kHz. I'm guessing it depends on what type of files they are?

Title: Re: Convolvers and Samplerate
Post by: stanzani on January 02, 2018, 02:26:17 pm

You cannot do DSP on the DSD stream. This is why they introduced DXD, which is a super PCM ;)
forget about filtering, eq, DRC etc. in the DSD domain, leaving the D upfront as a marketinh hype for DSD enthusisiasts

Title: Re: Convolvers and Samplerate
Post by: Hendrik on January 02, 2018, 03:23:09 pm

DXD is just plain PCM, its not any special, just marketing.

Title: Re: Convolvers and Samplerate
Post by: PMA! on January 03, 2018, 01:21:26 am

Quote from: Hendrik on January 02, 2018, 03:23:09 pm

DXD is just plain PCM, its not any special, just marketing.

Yes, but regardless of what you feel about marketing schemes, will the convolver be sampled higher than 192?

Title: Re: Convolvers and Samplerate
Post by: Hendrik on January 03, 2018, 05:24:46 am

Our convolver is not limited. If you can output at such high sample rates, then it'll also process the convolution at those rates.

Title: Re: Convolvers and Samplerate
Post by: amdismal on January 04, 2018, 02:50:18 am

As you move to higher sample rates you need more taps - and hence loads of processing power - for lower frequency crossovers and phase correction. You may find that this is the limiting factor.

I unroll the phase on my reflex port, which is tuned to 29Hz. On a recent i5 processor it starts to use a lot of processor at 96kHz sample rate, so I end up downsampling any very high res stuff to that.

Note that MC has the facility to automatically load convolvers that match the sample rate you're playing, so it can change on the fly from 44.1 to 96 etc