hello everyone this is amir from audio science review welcome to another episode of inside uh
your high resolution music this is by request again to look at the free samples that
the linn records provides for free so feel free to go to this url and download and play with
the same files there are three tracks here i've downloaded the highest quality available which is
192 kilohertz uh 24-bit uh samples i have brought those into adobe audition and i'm
going to go ahead and play these for you one at a time and let's see what we discover
so oops let me get this to be at the beginning
so there we go pausing this uh it's a piano piece we immediately see usual problems uh
these ultrasonic tones are there uh four over my count interesting enough the frequency is actually
different in different channels blue is one channel red is the other channel and so they're
actually picking up different frequencies rather than the same frequencies so different problems
there i don't have an explanation for them again they could be crt monitor scans and
other ultrasonic sources in the environment
other than that we have a slightly rising noise floor which is some kind of noise
shaping happening not not much to talk about but but it's there um playing the track again
we see that piano really doesn't have much of a spectrum as ultrasonics go
i'd say it's about 20 20 20 kilos to 25 kilohertz looking at the heat map we see that above
about this level or so it's all black so there's really no spectrum in here
so this could have been sampled at 88 kilohertz uh without any problems and at 88 kilohertz we would
have cut off at 44 kilos here not have any of this rising nose floor or these peaks so uh same story
as other music that we've examined disappointing that these are there fortunate levels are not
so extreme but the frequencies are quite high so let's move on to the second track they provided
and again let me pull this to the beginning and let's play that
immediately we see the issues rising out of the noise floor this is an organ piece
uh i can't see any reason for this to be there this and the other peaks let it continue to play
so we see the usual problems peaks in here not lower frequencies are more bothersome
so this is 26 kilohertz this beak is there this one's there notice it's just in one channel again
not in the other channel likewise we have one channel here picking up some garbage here and
not in the other one uh moving this to the end let's see what happens when there's silence
oops so again even during silence we have all these peaks uh it's just disappointing
how common this problem is clearly there's just no attention paid to uh cleaning up ultrasonic
uh people probably just listen to the clips and if they don't hear something they go ahead and
record and produce this content and ship it to us more hygiene is definitely necessary
let's go to the third clip the third clip and see what's going on there
it's quite fascinating here check out the scalloping uh comb filtering type
of response this isn't that's in here we've got one here here here here here and it continues on
uh i just can't tell you what's causing that um unless this is the uh response
of the anti-aliasing filter and it's actually some of this signal here that's showing up here
as a lower amount of uh lower amplitude than goes on here but quite unusual it's not something i've
seen in recordings before so let's continue to play there's really no doubt that this
is all there and you know it's not correlated with music when music comes it overwhelms it
but as it's there as a background sort of
tones that keep going on and on we have our usual rising nose floral so uh because of noise shaping
what this southern peak was yeah it looks like there's actually musical information
the microphone has pretty good bandwidth and he's trying to struggle and to push above
this noise floor if this rising noise floor wasn't there and we didn't have this garbage
this is a quite a wide bandwidth uh recording as far as the microphones are concerned
so pulling this all the way to the end and see what happens during the silence again
again we see all this statically there so definitely definitely not good uh disappointing
on multiple fronts you know in addition to the usual peaks that we have now we have this
tons of spectrum over here that scallops up and down uh some of these are awfully close to the
audible band i mean check out this one it's right at 20 kilohertz even this one might be suspect so
you know this is supposed to be silence and instead we have this all the way down to 14
15 kilohertz something is generating this spray of harmonics uh yeah thinking about
this may actually be a switching power supply of some sort maybe powering uh
some amplifiers something in the signal path that's generating all this it could also even
be their lighting system actually thinking about it out loud could be some kind of
switching power supply that's powering led lights of the sword that's generating all of this noise
i definitely wouldn't call this high resolution music so
have these offered as a sample of what high resolution music could provide is disappointing
subjectively none of this sounds like it needs high resolution piano music and
vocals and and organ wouldn't be my choice if something that that needs ultra high spectrum
i know there's some arguments about timing resolution what have you we'll leave that to
a future episode but again disappointing um for samples i expect to see pristine and clean
musical samples provided to us not stuff that looks like this so that's it again
this is Amir from audiosciencereview.com talk to you later in a future video bye-bye