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<blockquote data-quote="ΣΤΑΥΡΟΣ ΤΡΥΠΗΣ" data-source="post: 1057217679" data-attributes="member: 596"><p>Συγχωριανοί, θέλω να σχολιάσουμε την παρακάτω απάντηση του υπεύθυνου του daphile <em>(και που αφορούσε στο γιατί η τωρινή και προηγούμενη έκδοση του software είχαν τόσο μεγάλη ηχητική διαφορά - κάτι που απέδωσα και εγώ ο ίδιος στο "φτηνό" ODAC)</em>:</p><p></p><p>"Hi,</p><p></p><p>If you use the bitperfect settings for Daphile then the software should </p><p>not really effect on audio quality. However if the DAC is not "isolated" </p><p>well enough from the PC electronics then it's possible that software </p><p>changes could cause also changes in audio quality (at least </p><p>theoretically). But such the changes and effects are dependent on </p><p>hardware. The same change could improve the situation with certain </p><p>hardware combination but also worsen with some other set of hardware.</p><p></p><p>One of the most probable reasons is that the jitter noise effects on </p><p>audio quality (read for example </p><p><a href="http://www.jitter.de/english/soundfr.html" target="_blank">http://www.jitter.de/english/soundfr.html</a>). And if you don't use fully </p><p>asynchronous communication between PC and DAC, then the timing accuracy </p><p>i.e. jitter noise is greatly determined by the PC hardware. And again </p><p>the software changes could effect on jitter but the effect is pretty random.</p><p></p><p>Another possible explanation is that electromagnetic interference </p><p>(EMI/RFI) from PC effects on audio quality of the DAC if it does not </p><p>have good enough protection against such interference. The software </p><p>changes could change PC EMI/RFI but again such a changes are dependent </p><p>on PC hardware and it's impossible to have generic software solution </p><p>that gives best results with all different hardware components.</p><p></p><p>This is why I recommend high quality asynchronous USB DAC that is </p><p>independently powered (not from PC USB port) and have good EMI/RFI </p><p>protection (eg. galvanic isolation between USB receiver part and the </p><p>analog audio circuitry of the DAC). My own main DAC is such that I </p><p>haven't ever experienced any audio quality differences between software </p><p>versions.</p><p></p><p>This topic is pretty debated on different forum. I based my own view on </p><p>personal experience but also my studies for master degree on electrical </p><p>engineering and digital signal processing.</p><p></p><p>Cheers</p><p>Kimmo"</p></blockquote><p></p>
[QUOTE="ΣΤΑΥΡΟΣ ΤΡΥΠΗΣ, post: 1057217679, member: 596"] Συγχωριανοί, θέλω να σχολιάσουμε την παρακάτω απάντηση του υπεύθυνου του daphile [I](και που αφορούσε στο γιατί η τωρινή και προηγούμενη έκδοση του software είχαν τόσο μεγάλη ηχητική διαφορά - κάτι που απέδωσα και εγώ ο ίδιος στο "φτηνό" ODAC)[/I]: "Hi, If you use the bitperfect settings for Daphile then the software should not really effect on audio quality. However if the DAC is not "isolated" well enough from the PC electronics then it's possible that software changes could cause also changes in audio quality (at least theoretically). But such the changes and effects are dependent on hardware. The same change could improve the situation with certain hardware combination but also worsen with some other set of hardware. One of the most probable reasons is that the jitter noise effects on audio quality (read for example [url]http://www.jitter.de/english/soundfr.html[/url]). And if you don't use fully asynchronous communication between PC and DAC, then the timing accuracy i.e. jitter noise is greatly determined by the PC hardware. And again the software changes could effect on jitter but the effect is pretty random. Another possible explanation is that electromagnetic interference (EMI/RFI) from PC effects on audio quality of the DAC if it does not have good enough protection against such interference. The software changes could change PC EMI/RFI but again such a changes are dependent on PC hardware and it's impossible to have generic software solution that gives best results with all different hardware components. This is why I recommend high quality asynchronous USB DAC that is independently powered (not from PC USB port) and have good EMI/RFI protection (eg. galvanic isolation between USB receiver part and the analog audio circuitry of the DAC). My own main DAC is such that I haven't ever experienced any audio quality differences between software versions. This topic is pretty debated on different forum. I based my own view on personal experience but also my studies for master degree on electrical engineering and digital signal processing. Cheers Kimmo" [/QUOTE]
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