Comments by "Scott Franco" (@scottfranco1962) on "The Illusion Of Digital Audio" video.

  1. That sampling rate demo was worth the price of admission, well done. PCM or pulse code modulation should have nothing whatever to do with sampling. Pulse code modulation means to represent audio with simple on and off waveforms, ie., pure binary digital sampling. It was invented for the bell system, and means that instead of representing audio as a series of values, say 0-255 as for 8 bit sampling, you represent it as 0 or 1 values but represent the frequency information by increasing the frequency of the pulse transitions. There is no other meaning of the word "pulse", which is a digital term, not an analog one. PCM got hyjacked a as a general term for analog to digital convertion, perhaps because IBM-PCs used to be capable only of pulse code modulation of the speaker. There was not A/D converter, programs made all sounds via pure on/off waveforms or squarewaves, and there were even some programs that attempted to make crude speech via this method. I note that you are calling this PDM in the video, but, again, the word "pulse" is unambiguous. It does not mean A/D conversion. Sometime I would like to research when and perhaps why the term PCM got misappropriated.
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  2.  @TheWeepingCorpse  Then do tell.... what is being modulated about the pulse if not the width? As in what is PCM? If you look up the definition of PCM? Here is the wikipedia: "Pulse-code modulation (PCM) is a method used to digitally represent sampled analog signals. It is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio applications. In a PCM stream, the amplitude of the analog signal is sampled regularly at uniform intervals, and each sample is quantized to the nearest value within a range of digital steps." Meaning that the value is "sampled regularly at uniform intervals" and " quantized to the nearest value" meaning fed through a A to D converter. What part of that is PULSE???????
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