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Originally Posted by
oldeanalogueguy
FS is meaningless in the analog domain
you can turn the knob to the left to control how large the analog signal will be. you can turn a hot signal in the digital domain to -60db in the analog if you want to.
dB FS levels are not
entirely meaningless if the levels have been calibrated, hence my mention of calibrating, but the whole point of this thread is that the relationship is not as direct as one might presume. At least with most basic meters included in most DAWs.
Anyway, imagine taking a sine wave signal in the digital domain that peaks at -6 dB FS. Calibrate your system so that you measure -12 dBu peak at the outputs in the analogue domain. Now feed the signal in my picture to the same DAC
without touching the volume/gain control! This signal will peak at above 0 dBu and not at -6 dBu as one might suspect. Get it?
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digital Samples do not equate to analog signals that way!!
What are you basing this on? Did you read Dan Lavry's paper?
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thta is the way you drew them. you cannot mix domains!!!
I didn't draw anything. The software shows a reconstructed waveform. That is what it would look like
in the analogue domain if you attached an oscilloscope to the output of your DAC when fed with that signal.
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nyquist guarantees that the analog will be higher than the digital samples in many places cause the digital was lower than the analog when it was sampled originally and you COULD get back the same signal.
This is a meaningless comment as it stands.
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but when you get it back you can adjust the absolute max out of the D/A with the gain knob. you can get back bigger or smaller signal with the same shape.
This is not what we are talking about.
On second thought, this book might be more accessible than Pohlmann's:
Digital Audio Explained: For the Audio Engineer: Amazon.co.uk: Nika Aldrich: Books
Alistair