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what is bitrate?
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Colin OOOD
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Posted : Dec 10, 2008 19:47
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On 2008-12-10 08:54, vegetal wrote:
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On 2008-12-10 08:23, piko_bianko wrote:
if i create a project in 22.05khz and resample it into 44.1khz, what will the additional 22050 samples be ? 
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Copies of the previous sample?
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On 2008-12-10 14:21, Chemogen wrote:
When sampling at a rate of 22kHz, your highest freqency will be around 11kHz...I suppose the additional samples would make up the rest of your range.
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arrggghghghghghghg nononononononono lol
I guess it's possible that a SRC algorithm would double-up sample values but since this would introduce short horizontal 'steps' into the waveform, it would most likely sound very aliased and not good. As for the extra samples 'making up the rest of the range' - you don't get any extra detail or frequencies by SRC to a higher sample rate; what comes out should sound identical to what goes in.
As far as I know, most sample rate conversion algorithms work by interpolating the existing data values to produce new data values which will reconstruct the same waveshape when played back at the new sample rate. So if your 22.05KHz waveform contains the values 0, 1, 2, 3 etc, when SRC to 44.1KHz (twice the samplerate) the new values would be 0, 0.5, 1, 1.5, 2, 2.5, 3 etc - because the new rate is twice the old rate, the additional data needed for the higher samplerate would fall exactly in-between the old ones, as they would happen twice as often but still result in the same waveform.
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Chemogen
IsraTrance Full Member
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Posted : Dec 11, 2008 02:17
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Whoops on my part, didn't read the question properly and thought he was asking what the difference between sampling at 22khz and 44khz would be...Not the result of resampling a signal.
Good thing this isn't Audio100 final paper.  |
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orbit
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Posted : Dec 13, 2008 03:00
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ok sweet i get it now, very much like pixels! so say if i want to do a bit of mastering i bounce 24 bit then do a little mastering and add the waves IDR at the end then bounce back to 16 bit for cd right?
i also did an experiment bouncing 24bit @96khz and to my suprise the track doubled in time, sounded really slow and lost about 10khz upward on the spectrum, why is that? |
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Colin OOOD
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Posted : Dec 13, 2008 03:38
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On 2008-12-13 03:00, orbit wrote:
say if i want to do a bit of mastering i bounce 24 bit then do a little mastering and add the waves IDR at the end then bounce back to 16 bit for cd right?
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This is how I do mine I master to 32-bit with no dither so I can generate versions at whatever bitrate is necessary without re-rendering.
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| i also did an experiment bouncing 24bit @96khz and to my suprise the track doubled in time, sounded really slow and lost about 10khz upward on the spectrum, why is that?
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Sounds like you were listening to it at the wrong sample-rate.
Mastering - http://mastering.OOOD.net :: www.is.gd/mastering
OOOD 5th album 'You Think You Are' - www.is.gd/tobuyoood :: www.OOOD.net
www.facebook.com/OOOD.music :: www.soundcloud.com/oood
Contact for bookings/mastering - colin@oood.net |
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psylevation
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Posted : Dec 13, 2008 08:28
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Elad is on the right path when he said it's like pixels.
Imagine a line ____________________
The line represents real analog audio which is a seamless vibration(s) that makes up the sound. When you turn analog into digital (or create digital and turn it into analog) the higher the bit depth and sample rate the better the re-creation (the more real it sounds)
So a low bit depth and sample rate would make the line look like this
Low bit depth/sample rate _ _ _ _ _ _ _
You actually lose parts of the audio
High bit depth/sample rate ______________
You lose less parts of the audio and it sounds clearer and more defined.
If it's a very high bit depth and sample rate you can't hear the spaces where the sound wasn't sampled(or created).
So the higher you can go the better, but you have to balance that out with processing power and hard drive space and understand that you may have to reduce the quality to fit a standard like CD's or MP3's. But that's the basic concept.
~Airyck~
~Unoccupied Mind ~
Psyowa! |
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