{"id":4787,"date":"2019-05-20T01:00:03","date_gmt":"2019-05-19T22:00:03","guid":{"rendered":"http:\/\/www.ufukonen.com\/tr\/?p=4787"},"modified":"2021-04-21T23:38:24","modified_gmt":"2021-04-21T20:38:24","slug":"kompresor-attack-suresi-gorsel","status":"publish","type":"post","link":"https:\/\/www.ufukonen.com\/tr\/kompresor-attack-suresi-gorsel.html","title":{"rendered":"Kompres\u00f6r Attack S\u00fcresinin Sese Etkisini G\u00f6rselle\u015ftirecek Olursak…"},"content":{"rendered":"

Attack s\u00fcresi, kompres\u00f6r \u00fczerindeki en kritik parametreleriden biridir. Sinyal seviyesi threshold seviyesini ge\u00e7ti\u011finde kompres\u00f6r\u00fcn devreye girip hangi s\u00fcrede sinyali \u00fczerindeki ayarlara g\u00f6re tam olarak s\u0131k\u0131\u015ft\u0131raca\u011f\u0131n\u0131 belirler. Milisaniye (ms, msec) cinsinden ifade edilir.<\/p>\n

Attack s\u00fcresinin en kritik parametrelerden biri olmas\u0131n\u0131n sebebleri, bir yandan kompres\u00f6r\u00fcn nas\u0131l bir h\u0131zda tepki verece\u011fini belirlemesi, bir yandan da sesin karakteristi\u011fi \u00fczerinde de\u011fi\u015fiklik yapma g\u00fcc\u00fcne sahip olmas\u0131d\u0131r. \u00d6rnek olarak vurmal\u0131 enstr\u00fcmanlarda \u00e7ok h\u0131zl\u0131 (\u00e7ok k\u0131sa) attack s\u00fcreleri transient’lar\u0131 ezip enstr\u00fcman\u0131n dinamiklerini \u00f6ld\u00fcrebilir.<\/p>\n

Attack parametresinin ses \u00fczerinde yaratt\u0131\u011f\u0131 etkiyi g\u00f6rmek i\u00e7in bir sin\u00fcs dalgas\u0131 kullanabiliriz.<\/p>\n

A\u015fa\u011f\u0131da 100 milisaniye uzunlu\u011funda -6 dBFS seviyesinde 1 kHz sin\u00fcs dalgas\u0131 g\u00f6r\u00fcyorsunuz.<\/p>\n

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1 kHz sin\u00fcs dalgas\u0131<\/p><\/div>\n

\u015eimdi bu sin\u00fcs dalgas\u0131na kompres\u00f6r ile s\u0131k\u0131\u015ft\u0131rma uygulayal\u0131m. Threshold seviyesini -30 dB, oran\u0131 8:1 ve attack s\u00fcresini de 50 ms olarak ayarlayal\u0131m.<\/p>\n

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1 kHz sin\u00fcs dalgas\u0131 | attack s\u00fcresi 50 ms<\/p><\/div>\n

Yukar\u0131daki ekran g\u00f6r\u00fcnt\u00fcs\u00fcnde de g\u00f6r\u00fcld\u00fc\u011f\u00fc gibi kompres\u00f6r devreye giriyor ve 50 ms i\u00e7inde tam s\u0131k\u0131\u015ft\u0131rma elde ediliyor.<\/p>\n

\u015eimdi attack s\u00fcresini 20 ms olacak \u015fekilde ayarlayal\u0131m.<\/p>\n

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1 kHz sin\u00fcs dalgas\u0131 | attack s\u00fcresi 20 ms<\/p><\/div>\n

Attack s\u00fcresini biraz daha k\u0131saltal\u0131m ve 5 ms olarak ayarlayal\u0131m.<\/p>\n

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1 kHz sin\u00fcs dalgas\u0131 | attack s\u00fcresi 5 ms<\/p><\/div>\n

Ekran g\u00f6r\u00fcnt\u00fclerinden de kolayl\u0131kla anla\u015f\u0131ld\u0131\u011f\u0131 gibi attack s\u00fcresi k\u0131sald\u0131k\u00e7a kompres\u00f6r\u00fcn tam olarak s\u0131k\u0131\u015ft\u0131rma noktas\u0131na ula\u015fma s\u00fcresi de k\u0131sal\u0131yor.<\/p>\n

Attack s\u00fcresini 0.1 ms olarak ayarlad\u0131\u011f\u0131m\u0131zda a\u015fa\u011f\u0131da g\u00f6rebilece\u011fimiz gibi kar\u015f\u0131m\u0131za ba\u015f\u0131 ve sonu seviye olarak ayn\u0131 olan bir ses dalgas\u0131 \u00e7\u0131k\u0131yor.<\/p>\n

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1 kHz sin\u00fcs dalgas\u0131 | attack s\u00fcresi 0.1 ms<\/p><\/div>\n

Lookahead \u00f6zelli\u011fi olmayan kompres\u00f6rlerde bunu elde etmek neredeyse imk\u00e2ns\u0131z gibi bir \u015fey. Bu \u00f6zellik ile ilgili olarak “Kompres\u00f6r \/ Limiter Lookahead \u00d6zelli\u011fi<\/a>” ve “Peki Ya Kullanmak \u0130stedi\u011fimiz Kompres\u00f6r \u00dczerinde Lookahead \u00d6zelli\u011fi Yoksa<\/a>?” ba\u015fl\u0131kl\u0131 iki yaz\u0131 yazm\u0131\u015ft\u0131m.<\/p>\n

Attack parametresi ile ilgili olarak dikkat edilmesi gereken nokta, \u00e7ok k\u0131sa attack s\u00fcrelerinin bozulmaya (distortion) yol a\u00e7\u0131yor olmas\u0131. 1 ms insan kula\u011f\u0131 taraf\u0131ndan alg\u0131lanamad\u0131\u011f\u0131 i\u00e7in 0.1 ms ve 1 ms aras\u0131nda genel vol\u00fcm alg\u0131lanmas\u0131 a\u00e7\u0131s\u0131ndan fark yoktur. 1 milisaniyelik attack s\u00fcresinde sinyalin bozulma riski daha az oldu\u011fundan, m\u00fcmk\u00fcn oldu\u011funca bu s\u00fcrenin alt\u0131na inmemekte fayda vard\u0131r.<\/p>\n

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1 kHz sin\u00fcs dalgas\u0131 | attack s\u00fcresi 1 ms (dalgan\u0131n ba\u015f\u0131na dikkat)<\/p><\/div>\n

Di\u011fer yandan, 1 ms attack s\u00fcresi uygulad\u0131\u011f\u0131n\u0131zda ge\u00e7mesine izin verdi\u011finiz transient \u00e7ok y\u00fcksek seviyedeyse, sinyalde bozulmaya yol a\u00e7acaksa, bu durumda buna m\u00fcdahale edilmesi gerekir. Tabii unutmamak gerekir ki bu t\u00fcr m\u00fcdahaleler kompres\u00f6rden \u00e7ok limiter ile yap\u0131lmaktad\u0131r.<\/p>\n

\u0130lgili yaz\u0131lar:<\/p>\n