Sample rate conversion |
Sample rate conversion |
 Apr 11 2011, 18:50
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#1
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Group: Members Posts: 8 Joined: 18-July 07 Member No.: 45403  |
Hello everyone.
I have a question regarding sample rate conversion algorightms. I don't know how they work, but I guess you guys are more familiar with this  Let's say I have a 48 kHz wave file that I want to use in something I have to mix with some 96 kHz material at certain places. This requires the 48 kHz file be resampled and in the end back to 48. So in short: does resampling 48 --> 96 --> 48 change the original or can the original be restored 100% ? I'm using Wavelab for this. |
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Apr 13 2011, 16:05
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#2
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 Group: Members Posts: 840 Joined: 7-October 01 Member No.: 235 |
QUOTE (2Bdecided @ Apr 13 2011, 15:21)  You can easily design it to do as you suggest, but that's not necessarily the way all are designed. Afaik all resamplers apply another lowpass on upsampling, be it 2x or some strange number from 44.1 to 96kHz. So when this lowpass is applied all relation to a pattern in the source is gone. Otherwise weŽll have an aliased, mirror above the sources max frequency. IsnŽt it? And if not, what software does that creation of added 0s correctly? |
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MannyCalavera Sample rate conversion Apr 11 2011, 18:50
saratoga QUOTE (MannyCalavera @ Apr 11 2011, 13:50... Apr 11 2011, 18:58 Arnold B. Krueger QUOTE (MannyCalavera @ Apr 11 2011, 13:50... Apr 12 2011, 14:29 Axon If you are just mixing, then you ought to be able ... Apr 12 2011, 20:09
2Bdecided QUOTE (Axon @ Apr 12 2011, 20:09) If the ... Apr 13 2011, 15:21 Axon QUOTE (2Bdecided @ Apr 13 2011, 09:21) Th... Apr 13 2011, 22:43 Canar QUOTE (Axon @ Apr 13 2011, 14:43) I think... Apr 14 2011, 00:03 Axon QUOTE (Canar @ Apr 13 2011, 18:03) QUOTE ... Apr 14 2011, 03:26 bandpass Given 10 seconds of 440Hz tone and upsampling from... Apr 13 2011, 20:25 Wombat QUOTE (bandpass @ Apr 13 2011, 20:25) Giv... Apr 13 2011, 20:47 bandpass QUOTE This must be lowpassed already even if i don... Apr 13 2011, 21:19 Wombat I admit i have no clue about some things you talk ... Apr 14 2011, 00:44 Canar QUOTE (Wombat @ Apr 13 2011, 16:44) I adm... Apr 14 2011, 00:52 Wombat QUOTE (Canar @ Apr 14 2011, 00:52) Sample... Apr 14 2011, 00:58 Canar QUOTE (Wombat @ Apr 13 2011, 16:58) Exact... Apr 14 2011, 01:03 saratoga QUOTE (Wombat @ Apr 13 2011, 19:44) I adm... Apr 14 2011, 01:03 Wombat QUOTE (saratoga @ Apr 14 2011, 01:03) Alt... Apr 14 2011, 01:11 saratoga QUOTE (Wombat @ Apr 13 2011, 20:11) QUOTE... Apr 14 2011, 01:17 bandpass QUOTE (saratoga @ Apr 14 2011, 01:17) Obv... Apr 14 2011, 07:30 Axon QUOTE (bandpass @ Apr 14 2011, 01:30) QUO... Apr 14 2011, 19:38 bandpass QUOTE (Axon @ Apr 14 2011, 19:38) Strictl... Apr 14 2011, 20:24 Wombat QUOTE (bandpass @ Apr 14 2011, 20:24) aft... Apr 14 2011, 20:46 bandpass QUOTE (Wombat @ Apr 14 2011, 20:46) I sti... Apr 14 2011, 22:16 Alexey Lukin QUOTE (bandpass @ Apr 14 2011, 17:16) Bec... Apr 14 2011, 22:26 Wombat QUOTE (bandpass @ Apr 14 2011, 22:16) Usi... Apr 14 2011, 22:27 bandpass QUOTE (Alexey Lukin @ Apr 14 2011, 22:26)... Apr 15 2011, 07:18 Alexey Lukin 48 -> 96 kHz conversion may leave signal sample... Apr 14 2011, 21:35 Wombat QUOTE (Alexey Lukin @ Apr 14 2011, 21:35)... Apr 14 2011, 21:49 Wombat I am getting slowly mad in here or lowpass myself ... Apr 14 2011, 22:49 bandpass Okay, curiousity got the better of me: in the 48k ... Apr 15 2011, 10:39 Wombat Many thanks bandpass for your efforts. Very intere... Apr 15 2011, 16:24 Alexey Lukin I've just verified that SoX never preserves th... Apr 15 2011, 17:10 Wombat QUOTE (Alexey Lukin @ Apr 15 2011, 17:10)... Apr 15 2011, 18:11 bandpass All I have told you is what I have observed throug... Apr 15 2011, 22:17 Alexey Lukin This is only due to the fact that you used the sin... Apr 16 2011, 06:27 bandpass QUOTE (Alexey Lukin @ Apr 16 2011, 06:27)... Apr 16 2011, 08:41 Alexey Lukin Agreed. Apr 16 2011, 08:45 |
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