The Mac does not send the original digital data. It is a voltage and no DAC can correct for amplitude distortion that comes from noisy voltage - that amplitude becomes the signal that the DAC receives, it's not signal plus noise, just a dirty signal that we hear. A square wave may be called a digital signal, but it's technically an analog wave form. Voltage is used at the output to convert the data from a PWM signal to a PCM signal and again from a PCM voltage to an optical signal, which is then converted back to a voltage at the receiving end.Ī cable is sending voltages just like the computer. The resulting versions of the audio square wave IS the square wave that is sent to the DAC as no correction can be done to "guesswork." Each piece of software, every algorithm, and every background process creates a duplicate version of the audio square wave using voltage from the power supply.
Audio data, however, is being processed in real time.
If an error occurs the data is resent or a crash occurs. Applications are buffered and their data are sent in packets which are checked for errors. A square wave is an analog representation of a digital signal and has both an amplitude and timing component to it.Īpplications are not real time, the data they are processing is. You are missing a very critical element here.Īn audio signal on a computer is a square wave, not ones and zeros.
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