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Forums     Plugins     r8brain PRO Converting 88.2 kHz sample to 44.1


Info appreciated from neilwilkes.  Thanks.

We are not commercial.  We have 4 channel analog material recorded in 1960s-90s.  It was transferred to hard drive (Alesis HD24XR) for archiving because the tapes (Ampex 407) were deteriorating.  The sampling rate was 88.2 kHz.

I am using r8brain for sample change of the four tracks to 44.1.  Then using SurCode CD-DTS to encode.  Then using a burning software to produce the dts CD, Works well.

Just wondering about the questions asked above Thanks.


4-ch-guy: 1.  Does the pro version of r8brain convert faster?

Pro version is not faster - it can be comparable in speed with 'High quality' mode of the free version, though.

4-ch-guy: 2.  Will there be a noticeable difference (increase) in sound quality from free-to-pro version?

For me, yes.  But you should try for yourself, of course.

4-ch-guy: 3.  Will there be noticeable increase in sound quality going from ''medium'' to ''high'' or ''very high'' and does the higher quality involve more number crunching and time to do it?

There are no such options in the PRO version.  But in case of the free version, quality does increase with the setting, and that also translates into higher calculations amount necessary to perform the conversion.


4-ch-guy: We are not commercial.  We have 4 channel analog material recorded in 1960s-90s.  It was transferred to hard drive (Alesis HD24XR) for archiving because the tapes (Ampex 407) were deteriorating.  The sampling rate was 88.2 kHz.

This makes a lot of difference!  When you mentioned resampling from DTS, I took this to mean a DTS encoded multiplex from a DVD or similar, which would have already been subject to massive data reduction.  Recording from 4-Track to 88.2KHz sample rates and then SRC to 44.1 followed by DTS will not cause additional data reduction above what you do to create the DTS-WAV file.  I misunderstood what you did, and apologize unreservedly.

4-ch-guy: Just wondering about the questions asked above Thanks.

IMHO, R8Brain Pro just sounds better.  I use the Ultra Steep Slope & Minimum Phase options, as Linear Phase can introduce a ringing artefact in the upper midrange.

Not certain these options are there in the free version.

There is absolutely nothing lost by recording at 24/96 and SRC to 44.1 either - R8Brain Pro uses whole numbers to perform the calculations, not fractions, so all the old arguments about 96 to 44.1 not working well due to fractions are invalid.  It uses GCD to go up first, then down.

(96,000Hz x 147 = 14,112,000Hz / 320 = 44,100Hz so no rounding).

The ultimate accolade for this is that Bob Katz uses it routinely.  I think it is one of the best spends I have ever made.

www.opusproductions.com

Multichannel Audio Specialists

DVD-A, DVD-V Authoring

Mixing & Mastering to most formats


My thanks to both neilwilkes and Aleksey.

I will get the pro version.


One more question, please.

I just noticed that there is a light and a full version.  Two questions:

(1) If I purchased light and decided to get full is that possible and if so at what cost?

(2) Considering that our only rate conversion will be 88.2 to 44.1 do you think that the light will be sufficient for that purpose?

Thanks again


From the description on the product page

The Light version offers you a linear-phase conversion mode and up to 48 kHz output sample rates only while supporting all input sample rates.  The Full version offers you all features of the software.

I'd go for the full version.  The Minimum Phase option is worth it - and then some!

www.opusproductions.com

Multichannel Audio Specialists

DVD-A, DVD-V Authoring

Mixing & Mastering to most formats


Thanks for suggestion.

Not being a pro I don't know what "minimum phase option is"


I was certain all this is in the manual for the beast - maybe not though.

Minimum Phase is the software equivalent of going through some seriously tasty Outboard/High End DAC/ADC instead of the phase coherent "Linear Phase" mode.

The difference is that Linear Phase can introduce artefacts like a ringing sound in the upper registers.  Minimum Phase adds an almost analogue warmth to the SRC. (I know it's not really analogue, but it somehow sounds much more like the real, serious high-end stuff.

www.opusproductions.com

Multichannel Audio Specialists

DVD-A, DVD-V Authoring

Mixing & Mastering to most formats


4-ch-guy: (1) If I purchased light and decided to get full is that possible and if so at what cost?

Upgrading is not available at the moment.  But we do have plans to offer such crossgrades - just not immediately.

4-ch-guy: (2) Considering that our only rate conversion will be 88.2 to 44.1 do you think that the light will be sufficient for that purpose?

If you do not need upsampling then Light version should be OK.  Minimum-phase option is a plus and sounds a bit more human, but it's probably a luxury option - I'm not sure it is required for your situation.


Neil, thanks for your participation. :)
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