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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: I'm not an expert, but... posted by Al Sekela on June 15, 2006 at 11:10:41:
the assumption that measured 'distortion' is a constant fraction of signal independent of signal level needs to be examined carefullySome of the posts here, which refer to a Stereophile Article by Keith Howard, seem to imply that assumption, but if you look at the article, that assumption isn't being made. The software Keith Howard wrote assumes that the distortion the user specifies is at full scale in the digital domain. The nonlinear transfer characteristic (digital count out vs digital count in) is expressed as a Taylor series expansion about zero. Using some trig identities, the coefficients in the Taylor series expansion are found by solving simultaneous equations using the desired distortion amplitudes for each of the harmonics at full scale as the right hand side of each equation.
See the article for more details. Also, if you download his software, the readme specifies additonal details.
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Follow Ups
- Here's the article morricab was referring to - andy_c 11:48:59 06/15/06 (4)
- What is 'nonlinear distortion?' - Al Sekela 15:24:34 06/15/06 (3)
- Re: What is 'nonlinear distortion?' - andy_c 16:21:52 06/15/06 (2)
- Yes, thanks, but this assumes distortion gets smaller - Al Sekela 12:28:54 06/16/06 (1)
- "crossover" (zero crossing) distortion in particular... - real_jj 13:59:58 06/16/06 (0)
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