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The external DAC does that conversion and processing. When using an external DAC the data is never changed from its original digital form whilst in the Mac. If the Mac was acting as the DAC then you would be right but I have clearly said I was talking about using an external DAC. As such the Mac is not altering the original digital data. If you are using an external DAC the Mac is not processing the audio signal the external DAC is. That information gets masked and distortion by noise that introduces harmonic content that doesn't exist in the orginal file. But a digital square wave contains tremendous amounts of frequency, timing, amplitude and harmonic information. Just because a device says its bit perfect is irrelevant, it only means a signal is within a certain range. Bit perfect audio is a misnomer and does not exist in digital audio.
#POWER SUPPLY FOR MAC MINI A1175 SOFTWARE#
It just depends on whether it's a dithered volume control or not and what piece of software you are using. You can control the volume on the Mac using optical. Some audiophile applications attempt to buffer this real time process by loading it into memory for processing and hijacking system resources, but this does not negate everything outside of this software and the fact that it is still processed in real time where format conversion and duplication occurs. Once a file leaves the hard drive and hits the first piece of software it is processed in real time. new versions are created each time a process is done. If you are using itunes, there are several layers of processing that ocurr within itunes, each of which creates duplicate version of the original data based on mathematical algorithms.
The Mac does not send the original digital data.
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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. consider using a fantastic and incredibly inexpensi.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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