Streaming audio. So far, so no good...
- Thread starter Tzimisce
- Start date
Ax. αν τα καλώδια που έχεις είναι καλά, μπορείς να τα κόψεις στο επιθυμητό μήκος και να τους βάλεις βύσματα.εχω μπει στο νεο σπιτι απο 31 απριλιου
Εχω κανει αιτηση απο 5 απριλιου για μεταγορα γραμμης και συνδεση σε οπτικη ftth
εχω τραβηξει μονος μου την οπτικη απο τον οροφο εως το σπιτι μου μεσα και το εχω αναφερει στην αιτηση μου
Αρα το μονο που μενει ειναι να ερθει οτεχνικος με το ρουτερ να το συνδεσει και να γινει η συνδεση
Αναγκαστικα παιζω μεσω bluetooth ...γμιται η νοβα
εχω ηδη αγορασει ενα switch tplink και εχω παραγγειλει 3 ethernet καλωδιααπο αμαζον γερμανιας ( διοτι τα προηγουμενα μου ηταν μεγαλα σε μηκος και τωρα δεν τα χρειζομαι ......και απλα περιμενω την νοβα
εννοειται καθε μερα τους παιρνω τηλ και τους πριζω τα συκωτια
Πχ
Ποια πήρες από αμαζον??
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Σε επίπεδο software γίνεται, αλλά από ότι βλέπω το Fritz box 7590 δεν υποστηρίζει αυτά που θέλουμε.
Ή τουλάχιστον δεν βλέπω τον τρόπο να γίνει VLAN segmentation και να στηθούν firewall rules στο επίπεδο που το θέλουμε.
Εισάγει DAC και ADC μετατροπές.
Άλλωστε φαίνεται και από το ότι χωρίς να αλλάξει USB καλώδιο, το αποτέλεσμα ........μεταβάλλεται.
Αναλυτικότερα από το Audio Science Review:
You have made a good effort here. Alas, you have missed the most fundamental problem in null testing:
the output and hence the recording can drift causing differences that show up in null test even if nothing else is changed!
DACs have local clocks and jitter which can varying the timing/phase down to sub-sample level. You will NOT be able to make such alignment visually.
In addition, the analog output of DACs is not very stable. They can drift up and down during the play or from time to time due to many factors (temperature, stability, etc.).
Ditto for ADC capture. This must also be compensated for. Otherwise you will hear the level difference as sounding like the source.
Net, net, digital input was consistent. What was not consistent in your methodology was analog output of a DAC.
By definition analog is subject to noise, level and timing shifts. You must remove these extraneous factors that dominate such tests.
Without it, you are just seeing/hearing effects of errors in analog waveforms, not anything to do with USB.
The above is why when you captured the same cables two days in a row, you got two different outputs.
The input had not changed. The output naturally drifted as I explained.
You should repeat this test over and over again and with it, you will see that there are variations as great as what you thought was attributed to USB cables.
Since no cable is changed, it invalidates your cause and effect conclusion.
Fortunately some tools have been developed to deal with these issues.
The best one is deltawave: https://www.audiosciencereview.com/...test-deltawave-null-comparison-software.6633/.
As you see in the thread there, it compensates for the issues above.
Even then though, the nulling won't be infinite. There will always be some error even in identical sequential captures. But if you know what you are doing, you can extract useful info from it.
If you want to learn more, there is a paper from Audio Engineering Society on this very topic: https://www.aes.org/e-lib/browse.cfm?elib=14680
The tool that was developed as a result of that paper doesn't work very well so I suggest using deltawave.
Bottom line, you have not discovered changes in USB input to a DAC.
You have simply discovered that null testing requires specialized tool and understanding of the methodology or it produces garbage results.
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