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Old 22-01-2014, 08:52 PM   #6
Everbeatz
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Default Re: Plugins 88200/24bit

Quote:
Originally Posted by psionic View Post
Aliasing je pojava koja nastaje zbog upotrebe LP filtera na A/D konverziji i ima veze sa frekvencijom semplovanja - sto je vislja, manja je pojava aliasinga. U ekvilajzerima se barata raznim frekvencijama i moguce je pojava artifakta takve vrste... Kod EQa je vaznija i cujnija razlika sa faznim problemima, ali postoji i ovo kao problem. Takodje se podizanjem frekvencije semplovanja, menja i opseg na kome EQ efektivno radi.

Prosto receno - dizanje frekvencije ne dodaje sadrzaj, ali omogucava da se stvori tacka izmedju dve tacke, izmedju kojih ne bi mogla, da je na 44100 (niza rezolucija) Oversempling je u principu "fora" svakako da ima nekih zaobilaznih egzibicija, ali u principu - to je to.

Druga stvar - cist kompresor, a ne ove simulacije i emulacije, je po prirodi cista manipulacija sa jacinom signala, nema nikakvih dodatnih alikvota, faza i gluposti te vrste - prilicno je linearno.

Jos jednom ponavljam:
- eq - linearan proces
- kompresija, distorzija, saturacija - nelinearan proces

Dizanjem s.rate eq nece 'bolje raditi' zbog bolje 'rezolucije'. Drugo, ne postoji 'rezolucija' u audio-u - tu nastaje problem u stvari. Uzimanjem tog termina iz digital photo-a pravi velike probleme u razumevanju.

Predlazem ti da procitas white papers od Dan Lavry-ja

http://www.lavryengineering.com/

Nadji mi na jednom mestu gde pominje rec rezolucija.

A takodje procitaj i ovo:
http://varietyofsound.wordpress.com/...bout-aliasing/

Quote:
Aliasing
Under certain conditions, aliasing might appear. The aliasing effect is a pure digital effect and is always related to a frequency bandwidth limit. If a digital algorithm produces frequencies which are actually higher than the Nyquist frequency of the system, then aliasing artifacts are generated which usually folds back into the supported bandwidth and so gets visible in the spectrum. The usual method to avoid this is to increase the sample rate. Sometimes, aliasing is hard to spot in the visible spectrum and that is when it?s masked by harmonic distortion.
Pored toga - kompresor nije "cista manipulacija sa jacinom signala" jer ima tzv transfer curve i nelinearan je proces koji dodaje harmonike signalu - u sustini moze biti blaza ili jaca forma distorzije, sto nas dovodi do dodavanja harminika preko Niquist-a, a onda se vracamo na aliasing.
Makes sense?

https://en.wikipedia.org/wiki/Gain_compression

Quote:
Gain compression is a reduction in 'differential' or 'slope' gain caused by nonlinearity of the transfer function of the amplifying device. This nonlinearity may be caused by heat due to power dissipation, or by overdriving the active device beyond its linear region. It is a large signal phenomenon of circuits.
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