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Author Topic: 48.048kHz and 88.2kHz ???  (Read 8278 times)

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Offline Rick

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48.048kHz and 88.2kHz ???
« on: March 19, 2005, 12:04:22 PM »
What are these sampling rates used for?
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Offline creekfreak

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Re: 48.048kHz and 88.2kHz ???
« Reply #1 on: March 19, 2005, 12:11:51 PM »
well, 48 is used by many on their DAT decks...I use 48 all the time when ding 24bit since I can't tell a big enough difference between 48 and 96 at 24bit. Some use 88.2 since resampling to 44.1 for audio cd is easier
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Offline Rick

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Re: 48.048kHz and 88.2kHz ???
« Reply #2 on: March 19, 2005, 12:14:52 PM »
I know about 48. The SD722 has both 48 and 48.048
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Offline fozzy

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Re: 48.048kHz and 88.2kHz ???
« Reply #3 on: March 19, 2005, 12:22:15 PM »
ADAT compatibility i believe
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Offline creekfreak

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Re: 48.048kHz and 88.2kHz ???
« Reply #4 on: March 19, 2005, 12:22:40 PM »
interesting..I thought 48.048 was 48, just rounded off....interesting...now you have be interested in what that is about, did some research off google, appears that 48.048 is a slightly different sample rate commonly used when sycning with video sources...reading more to see why now
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Re: 48.048kHz and 88.2kHz ???
« Reply #5 on: March 19, 2005, 12:26:11 PM »
explains some of it in this article, very technical

http://www.editorsguild.com/newsletter/MayJun04/mayjun04_23-24_proj.htm
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Offline heath

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Re: 48.048kHz and 88.2kHz ???
« Reply #6 on: March 19, 2005, 03:03:05 PM »
we use 88.2 a LOT for high res recording that will eventually be brought down to 44.1  It's an easier conversion for the software mathmatically...

h
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Offline Brian

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Re: 48.048kHz and 88.2kHz ???
« Reply #7 on: March 19, 2005, 05:07:56 PM »
Quote from: heath on March 19, 2005, 03:03:05 PM
we use 88.2 a LOT for high res recording that will eventually be brought down to 44.1 It's an easier conversion for the software mathmatically...

h

QFT!!!

i use 88.2 all the time for the same reasons Heath does.

Hi Heath! 8)

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Offline oleg

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Re: 48.048kHz and 88.2kHz ???
« Reply #8 on: April 21, 2005, 02:16:59 PM »
Quote from: Rick on March 19, 2005, 12:04:22 PM
What are these sampling rates used for?
to match ntsc 29.97 if you shooting 30 fm per second film , then you slow down the audio by 0.o1%  to match the video  in telesine or editting
, the same with 88 for double sampling
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Offline trajhip2000

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Re: 48.048kHz and 88.2kHz ???
« Reply #9 on: April 21, 2005, 02:35:39 PM »
Quote from: heath on March 19, 2005, 03:03:05 PM
we use 88.2 a LOT for high res recording that will eventually be brought down to 44.1  It's an easier conversion for the software mathmatically...

h

this was my understanding also, until the moderator of one of the online audio forums (I think it was one of the Pro Sound Web forums) posted that what actually happens is most resampling software upsamples to some high rate (like 300-something KHz) and then brings it down to 44.1, meaning that there isn't any advantage in starting at 88.2 (vs 96) when your final sampling rate is 44.1. I've done a fair amount of searching since I saw that claim and haven't been able disprove it, but there doesn't actually seem to be a lot of info available on that topic in general.

Steve
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hexyjones

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Re: 48.048kHz and 88.2kHz ???
« Reply #10 on: April 21, 2005, 06:05:15 PM »
Anyone ever offer a 88.2 signal to a JB3..?
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Offline Tim

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Re: 48.048kHz and 88.2kHz ???
« Reply #11 on: April 21, 2005, 09:13:37 PM »
Quote from: boogie on April 21, 2005, 09:05:01 PM
Quote from: corkscrew on April 21, 2005, 06:05:15 PM
Anyone ever offer a 88.2 signal to a JB3..?

dude...

the JB3 is a cheap 16bit, low sample rate device (44.1/48)

use it for that and quit trying to make it do things it has no hope of doing well...remember its made by the kings of resampling; Creative Labs

if you want 24bit or higher sample rates than the JB3 can do, buy a recorder that can handle it

in audio resolution and accuracy costs money, there is no real way around that


boogie


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hexyjones

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Re: 48.048kHz and 88.2kHz ???
« Reply #12 on: April 21, 2005, 09:22:18 PM »
I just fed mine a 88/16 signal - the resulting playback is half speed...

As it recorded..the JB3 displayed 44.1 as the sample rate...
« Last Edit: April 21, 2005, 09:25:21 PM by corkscrew »
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Offline Brian

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Re: 48.048kHz and 88.2kHz ???
« Reply #13 on: April 21, 2005, 09:26:29 PM »
Quote from: corkscrew on April 21, 2005, 09:22:18 PM
I just fed mine a 88/16 signal - the resulting playback is half speed...

As it recorded..the JB3 displayed 44.1 as the sample rate...

yeah....cause it resampled ;)
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hexyjones

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Re: 48.048kHz and 88.2kHz ???
« Reply #14 on: April 21, 2005, 09:29:58 PM »
Quote from: STL-Taper on April 21, 2005, 09:26:29 PM
Quote from: corkscrew on April 21, 2005, 09:22:18 PM
I just fed mine a 88/16 signal - the resulting playback is half speed...

As it recorded..the JB3 displayed 44.1 as the sample rate...

yeah....cause it resampled ;)

Why do you think it resampled?

If anything - it shows it doesnt resample...twice as many samples at the source - thats why it plays at half speed - its an 88hz signal being treated as if it was 44.1
« Last Edit: April 21, 2005, 09:32:19 PM by corkscrew »
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