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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: phase distortion posted by real_jj on June 13, 2006 at 20:10:02:
The kind of distortion I have been considering falls into two basic categories.Dissipation distortion, that from branch analysis..where the wire dissipation difference is proportional to the square root of the product of the woofer and tweeter signal.
The second is fron inductive storage/slew rate analysis, where the time shift of the signal is dependent on the slope of another component of the signal..For example, a lagging shift on the bass current rise, a leading shift on the current fall. This is also consistent with the variation in damping factor/phase shift which occurs in all four quadrants of class B amplifiers.
It is clearly impossible to state that an FFT is capable of finding all classes of signals, we work on the assumption that it can see them all. And is it silly to make a claim that a class is definitely invisible to FFT's, that would have to be demonstrated.
And load resistors, while better than drivers for analysis, are still incapable of temporal resolution within the human range of capabilities.
Cheers, John
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Follow Ups
- Re: phase distortion - jneutron 06:25:15 06/14/06 (8)
- Well, actually, a fourier transform HAS to be able to detect them all... - real_jj 19:11:39 06/14/06 (7)
- Re: Well, actually, a fourier transform HAS to be able to detect them all... - jneutron 13:08:47 06/15/06 (6)
- Ahh, I see what you mean... there's a math error. - real_jj 13:41:14 06/15/06 (5)
- Re: Ahh, I see what you mean... there's a math error. - jneutron 14:02:41 06/15/06 (4)
- Yes, but you're missing the point.... - real_jj 14:30:30 06/15/06 (3)
- Actually, it's far more interesting than that - jneutron 06:23:52 06/16/06 (2)
- Well, I can only suggest that you look at each waveform in a simulation... - real_jj 14:22:56 06/16/06 (1)
- been there, done that. - jneutron 05:49:18 06/19/06 (0)
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