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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: Another Sample Of An Audio Component That Doesn't Measure Well, But Sounds Great. posted by tomservo on November 8, 2006 at 07:28:32:
> Now, if one actually samples a sine wave at 2X F, one finds that
> depending where in the wave one samples, one gets a totally different
> result.
> For example, imagine what you get as a sample if you sample at the
> peak amplitude OR at zero crossing.
> The later sampling gives Zero signal.You cannot sample at exactly 2X because it is not within the valid range to avoid ambiguity (i.e. cannot distinguish between sampling DC or a sine wave at half the sampling frequency) but you can sample at 2.001X and if you do so, to what level of fidelity can you reconstruct the original signal?
> Also, if one has a non constant amplitude (such as in music) then
> one has a wider bandwidth than the highest “Sine wave†frequency
> present.I am not sure I am picking up what you wish to convey with the quotes but agree that waveforms other than a constant sine wave will have more than one frequency present. Perhaps I am wrong but there appears to be an implication that this would raise the setting for the low pass filter?
> In the area of test equipment and not audio, these issues are real
> concerns as “accurate†measurements are the goal and as such, it is
> normal to have a sample rate much higher than the highest F to be
> measured.It was the x8 and for use in audio that I was querying since it would mean that 96kHz is insufficient which is in conflict both with what I thought I knew about digital signal processing and standard practice in the recording industry. Given that it is straightforward to use higher sampling rates with current hardware technology it would suggest a need to use greater than 96kHz is not currently being felt in the recording industry?
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Follow Ups
- Re: Another Sample Of An Audio Component That Doesn't Measure Well, But Sounds Great. - andy19191 14:30:44 11/08/06 (1)
- Re: Another Sample Of An Audio Component That Doesn't Measure Well, But Sounds Great. - tomservo 14:23:00 11/09/06 (0)
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