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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: Hmmm. posted by Charles Hansen on February 10, 2009 at 13:59:38:
I don’t have an arbitrary function generator either. Who needs one for digital audio? All you need is a computer. If you have computer, you can generate wave files and burn CDs as easily as I can.
DAC A is an AKM and DAC W is a Wolfson. I used your term “minimum phase†because, as you depicted on page 3 of your white paper, the Wolfson DAC minimizes pre-ringing at the expense of post-ringing.
All FIR filters are fatally flawed because they compute the value of each sample from a weighted average of the surrounding samples. That works perfectly for steady state sine waves but not music. Music is anything but steady state. Even the simplest melody starts, changes from note to note, and than stops. More often than not, the changes from one note to the next are abrupt. There are also continuous changes in pitch and amplitude in the fundamental and harmonics of each note as it is sounded. As I see it, FIR filters strive to create the smoothest sine wave output using the input signal as a guide. In the end, there is no direct correlation between the input and the output: Just a reinterpretation.
See also my reply to Mr. Lauck, below.
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Follow Ups
- RE: Hmmm. - jmlpartners 08:26:11 02/11/09 (2)
- Please e-mail your test files to me. - Charles Hansen 20:34:42 02/12/09 (0)
- RE: Hmmm. - Tony Lauck 11:11:39 02/11/09 (0)
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