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In my previous post I wrote "Clearly it is not just an alias of the original baseband audio, or it would be a mirror-image.". This would *only* be true if the DAC chip output a series of (ideally infinitely) narrow pulses. However virtually all DAC chips output a given level that is "held" until the next sample (called a "first-order hold"). This alters the frequency response of the output by convolving (basically superimposing) the frequency response of the "sinc" function, where sinc (x) = [sin(x)/x]. Regardless the original chart does not look like that either, so my confusion persists... :-(

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  • Correction - Charles Hansen 03:27:37 06/03/17 (0)


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