Zakaj je 44.1 kHz 16 bit dovolj ...

[JAZZZ]

[habo66]

Se strinjam, bi mnogi "pogrnili". Je pa spet odvisno 128, 160, 320, kvaliteta originala? Recimo da bi 64kb mp3 kar ločil, brez predhodnega poslušanja 44, 48, 96khz...

[JAZZZ]

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[vintagesonic]

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[JAZZZ]

[JAZZZ]

[vintagesonic]

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Iztok velja...bom danes nekaj našel in ti pošljem. In brez ditheringa, prosim.

Imam že nekaj svojih MP3/CD verzij in če se zmotim, kaj kmalu opazim, da se pohabljena verzija vrti...

Kakšnih resnih zaključkov na temo ali je 16/44k dovolj, pa iz takih testiranj ne moremo dobiti, pokažejo le sposobnosti zaznavanja poslušalca v danem trenutku.

Nekaj za petra_nn

Prosim, poglej spodnjo sliko, preberi tekst in osveži znanje iz linearne interpolacije in boš videl, da ni vse lepo v digilandiji:

Fig.3 illustrates the worst-case situation for linear interpolation, where the curvature of the signal waveform is at its greatest. For a sinewave, this occurs at the waveform's positive or negative peak, as illustrated. The black curve is the waveform, the red dots indicate adjacent sampling points symmetrically disposed about the waveform's peak value, and the blue dots indicate the interpolated values. Clearly, the error at the waveform peak is the largest. By specifying (1) the amplitude and frequency of the sinewave, and (2) how small we wish the error to be, it is possible to calculate the maximum sample spacing, and hence the sampling rate required to achieve this performance. If we take a full-scale sinewave at 5kHz as our criterion and require the maximum error to be 0.1 of a least significant bit (ie, a tenth of the quantization step size) for 16-bit coding, then the required sampling rate turns out to be 6.358MHz. For test material ripped from CD (as I've used in my simulations), the required upsampling ratio is therefore 144x. To simplify the computation, this was applied in four stages, of 2x, 3x, 4x, and 6x upsampling, respectively.

[gash]

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[gash]

Seveda mora vsak poslušat sam. Saj če jaz ne slišim razlik še ne pomeni, da jih ti ne.

Prav zato pa se mi zdi potrebno tak izziv, kot ti ga je ponudil JAZZZ, z odprtimi rokami sprejeti.

Še več... opraviti tak test je nujen korak za vsakogar, ki izbira izdelke glede zmožnosti "več kot 16 bitov", kar je pri streamerjih in playerjih danes marketinška sladica, ki jo marsikdo kupi, čeprav sploh ne ve kaj to dejansko pomeni.

[twom]

[JAZZZ]