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In Reply to: Re: Upsampling? Interpolation? posted by Frihed89 on September 28, 2005 at 11:41:42:
The whole process has to do with turning an analog signal into digital bits. You will do the bandlimiting on the analog signal, so that you don't get high frequency information aliasing down into your samples. You band limit based on the sampling rate, so that you end up sampling at greater than twice the highest frequency in the analog signal. Given this, you can reconstruct the original analog waveform exactly (in math, if not always in practice). And you can also construct any number of digital points from the original analog waveform- this is what usually seems to be meant by upsampling. Now, in theory, it would be possible to artifically construct high frequency information (above 22 kHz at CD sampling rates), but I doubt that this is done as part of upsampling. In general, upsampling is an undefined term so there's no real way to know. But not many people would consider content above 22 kHz to be that important anyway.
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Follow Ups
- Re: Upsampling? Interpolation? - tunenut 12:24:58 09/28/05 (3)
- Interpolation or extrapolation? Esoteric does... - Jim Pearce 12:41:56 09/29/05 (2)
- good info, thank you - tunenut 21:15:43 09/29/05 (1)
- Not only that, but.... - Jim Pearce 06:41:15 09/30/05 (0)
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