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Converting wav files to Emax samples using EMXP   Message List  
Reply | Forward Message #5601 of 6308 |
Re: Converting wav files to Emax samples using EMXP

I just made some comparisons based on your bass drum WAV files.

In a first test I have sent the 0DB and -4DB WAV file via MIDI DUMP to the Emax,
using Alchemy on Mac.
--> Result: there is no distortion in the samples on Emax, but imho the result
doesn't sound at all like the original WAVs. The samples on the Emax have quite
a low volume (no real problem) but also some annoying high pitch in them and
they sound dull.

In a second test I have created an Emax bank with EMXP.
--> Result: there is a clear distortion on the 0DB sample, but the -4DB sample
sounds very good and is almost identical to the original WAV file (or to the
EMAX-II version of this sample).

Of course the distortion of the first sample is not OK, so I will check EMXP's
conversion algorithm. It's clearly a problem of amplitude level because the
distortion is caused by clipping. So I'll have to check the normalization level
in my algorithm.

Maybe I will include an updated version of this algorithm in the next EMXP v2.07
(aka the "SoundFont2 release") which I hope to launch as a BETA version within
the next 2 weeks.

///E-Synthesist

--- In emax@yahoogroups.com, "bermudaben2006" <bermudaben2006@...> wrote:
>
> Has anyone ever compared the sound quality of EMXP and midi dump? As I said
earlier, I think sound quality of files converted with EMXP is perfectly ok if
you leave enough headroom before conversion. I have never used Midi dump though.
>
>
>
> --- In emax@yahoogroups.com, "jammie" <jammie.emma@> wrote:
> >
> > the best way to get a good quality sound into the emax is through midi
sample dump i use dissidants sample wrench as it works with all the old samplers
> > ----- Original Message -----
> > From: Chip
> > To: emax@yahoogroups.com
> > Sent: Monday, July 13, 2009 7:13 AM
> > Subject: [emax] Re: Converting wav files to Emax samples using EMXP
> >
> >
> >
> >
> >
> > another significat factor is the AD 12 bit conversor
> >
> > sometimes you get better results sampling a sound directly to emax's
sample input using a decent preamp.
> >
> > --- In emax@yahoogroups.com, "Rei" <vjrei@> wrote:
> > >
> > > The answer is very simple...
> > >
> > > Algoritms. Emu software is meant to work with Emu hardware. Is like when
you buy an iPod or any other music device, if you use some other kind of
headphones the sound is gonna be way different, usually bad.
> > >
> > > The OS of each Emu sampler is calibrated for its own hardware, if you
import an audio file only with the correct sample rate that doesn't mean
anything, you are missing the antialiasing filter, that is the one that gives
the texture and the quality to the actual sample other than the samplerate.
> > >
> > > EMXP is only downgrading the sample rate but is not resampli with
antialiasing/EQ or compression. That is what gives Emu its sound, they really
did an amazing job suking the sounds out of the technology back then.
> > >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>





Wed Jul 15, 2009 9:14 pm

esynthesist
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Message #5601 of 6308 |
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This is a question for esynthesist or anyone who uses his software: Why does EMXP convert my 44.1 KHz wav files to 41.7 Khz Emax samples, given that Emax...
bermudaben2006
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Jul 11, 2009
1:46 pm

it might be that to get all samples to fit in the emaxs memory that a bit of sample rate is lowered ... From: bermudaben2006 To: emax@yahoogroups.com Sent:...
jammie
jammie.emma
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Jul 11, 2009
8:56 pm

In fact EMXP never allows samplerates higher than 41667 Hz for Emax-1. I wanted to be sure that the banks would be compatible with all Emax-1 samplers. The...
esynthesist
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Jul 11, 2009
9:27 pm

Well, if you could take samples with Emax at both 42 and 44 KHz you probably wouldn't hear any difference. But converting 44.1 Khz samples is another thing,...
bermudaben2006
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Jul 12, 2009
9:04 am

Update: I have checked the Emax 8 bit compression algorithm in EMXP and applied some changes - there was indeed something wrong in the algorithm. It should be...
esynthesist
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Aug 13, 2009
7:22 pm

drum samples sound better at lower sample rates any way as they dont contain the whole frequency spectrum thats why hiphop producers prefer the 12bit sample...
jammie
jammie.emma
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Jul 12, 2009
9:59 am

I did some tests myself today. The lower quality of the Emax samples is not caused by the lower samplerate, but by the 12-to-8 bit compression algorithm. If...
esynthesist
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Jul 12, 2009
7:43 pm

The answer is very simple... Algoritms. Emu software is meant to work with Emu hardware. Is like when you buy an iPod or any other music device, if you use...
Rei
vjrei
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Jul 13, 2009
4:18 am

another significat factor is the AD 12 bit conversor sometimes you get better results sampling a sound directly to emax's sample input using a decent preamp....
Chip
xtr909x
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Jul 13, 2009
6:13 am

I did some more testing with EMXP... The answer to my problem with distortion really has to do with headroom, not with the conversion algorithm or with Emax's...
bermudaben2006
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Jul 13, 2009
10:42 am

This could be true. The conversion algorithm is quite sensitive to the level of the sound amplitude. When I designed it I thought I had made sure that even the...
esynthesist
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Jul 13, 2009
8:54 pm

the best way to get a good quality sound into the emax is through midi sample dump i use dissidants sample wrench as it works with all the old samplers ... ...
jammie
jammie.emma
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Jul 13, 2009
4:51 pm

so from what i'm reading, EMXP isn't going to give us the best sound quality? i've never had any distortion problems using it myself, but i've never done...
Brooks Mosher
brooksmosher
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Jul 13, 2009
4:56 pm

Has anyone ever compared the sound quality of EMXP and midi dump? As I said earlier, I think sound quality of files converted with EMXP is perfectly ok if you...
bermudaben2006
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Jul 13, 2009
9:24 pm

I just made some comparisons based on your bass drum WAV files. In a first test I have sent the 0DB and -4DB WAV file via MIDI DUMP to the Emax, using Alchemy...
esynthesist
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Jul 15, 2009
9:15 pm

in sample dump you have to dump 1 sample at a time it takes the sample 16 bits and transmits it at 12 bits i find the 27khz sample rate to be good for drum...
jammie
jammie.emma
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Jul 13, 2009
5:03 pm

Sample dumps over the RS422 port is my preferred method. ________________________________ From: jammie <jammie.emma@...> To: emax@yahoogroups.com ...
Elk Latham
elk_latham...
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Jul 13, 2009
5:28 pm

thats only good if you have the old mac setup not good for pc and i like to make up my own samples and not use other peoples sd2 bank files ... From: Elk...
jammie
jammie.emma
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Jul 13, 2009
6:56 pm

Your right about not being good for PC users. If you’re an Alchemy user on a mac you’re not limited to using sd2 files. I make all my samples as well.. ...
Elk Latham
elk_latham...
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Jul 13, 2009
7:09 pm

just curious, is RS422 better than MIDI for transferring sample files? ... [Non-text portions of this message have been removed]...
Brooks Mosher
brooksmosher
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Jul 13, 2009
7:14 pm

not better just faster a lot faster but not as fast as scsi but the emax does not respond to smdi any way so rs port is the fastes ... From: "Brooks Mosher"...
jammie
jammie.emma
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Jul 13, 2009
7:21 pm

There's also a certain stability to it like SCSI..   ________________________________ From: jammie <jammie.emma@...> To: emax@yahoogroups.com ...
Elk Latham
elk_latham...
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Jul 13, 2009
7:35 pm
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