Zrobiłem kodeka lepszego niż MP3! Przetwarzanie dźwięku w pigułce

Majsterkowanie i nie tylko April 6, 2024
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Interesujesz się elektroniką albo programowaniem? Dobrze trafiłeś! Znajdziesz tutaj zarówno proste projekty analogówki typu zasilacz regulowany, jak i bardziej skomplikowane projekty cyfrówki takie jak karta graficzna. Nie zabraknie tu też czystego programowania oraz porad serwisowych! Disclaimer: Układy pokazywane na niektórych filmach pracują przy napięciach niebezpiecznych dla zdrowia i życia! Pamiętaj, żeby w takim przypadku zachować szczególną ostrożność. Nie ponoszę odpowiedzialności za ewentualne uszczerbki na zdrowiu.

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Patrz w lusterka, kodeki audio są wszędzie. Slogan jak najbardziej na miejscu, ponieważ praktycznie każdy dźwięk wydobywający się z waszego telefonu czy komputera został skompresowany, a w chwili odtwarzania zdekodowany, przez jakiegoś kodeka. Format MP3 pewnie wszyscy znają, ale czy na pewno? Okazuje się, że za kulisami operacji z pozoru trywialnej siedzą skomplikowane algorytmy i zaawansowana matematyka. W dzisiejszym materiale postaram się przybliżyć Wam te zagadnienia na przykładzie kodeka, którego sam napisałem. Pliki projektu, artykuły: https://drive.google.com/drive/folders/13ZKwe5Au_TH8cp7Xd-V0ng7KqM8K4dwH?usp=sharing Analiza widma w kalkulatorze graficznym: https://www.desmos.com/calculator/cvogidsi37 Muzyka użyta w filmie: [napisy końcowe @ 43:51] Końcowy fragment Kapitana Bomby: https://youtu.be/5zpFfOaL_Yk?si=iQqPVPTzHe7b0XdL&t=93 ============== Rozkład jazdy ============== 0:00 Wstęp, historia kodeka 3:51 Format wave, pierwsze próby kompresji 8:22 Pierwszy etap kodowania audio 10:26 Trochę psychoakustyki 11:38 Transformata MDCT, czyli trochę matematyki 14:00 Przetwarzanie dźwięku w praktyce 20:00 Walka o prędkość 21:07 Kolejne etapy kompresji 26:58 Dlaczego DAC? Porównanie z MP3 28:47 Interfejs kodeka 31:07 Pierwsze odsłuchy 34:03 Pierwsza vs. ostateczna wersja kodeka 35:31 DAC vs. MP3 38:20 MP3 vs. VORBIS 39:08 Kompozycja od widza 41:37 Trochę wokalu, creditsy, stacja końcowa ======================================= Najchętniej oglądane: Odtwarzanie filmów na wyświetlaczu VFD: https://youtu.be/k8uXHcAtzMA Arduino z elektrozłomu: https://youtu.be/qCCYOXFypAA Zmiana prądu ładowania w prostowniku do akumulatorów: https://youtu.be/cLnT3vjYuDw Odzysk danych z telefonu: https://youtu.be/nWkRIAkJ0cI Karta graficzna DIY: https://youtu.be/IGg2E9WuIUo Sprawdzanie elementów elektronicznych zwykłym miernikiem: https://youtu.be/Ma2-iCmTIYM Przetwornica czysty sinus: https://youtu.be/0wGCu7AFEa0 Naprawa dużego zasilacza impulsowego: https://youtu.be/Abhlw8diSrk Prosta przetwornica z 12V na 230V: https://youtu.be/3zWLICKKh-g Naprawa zasilacza impulsowego 12V: https://youtu.be/Iu39mjOIvAw Naprawa zasilacza ATX: https://youtu.be/3IPjhcXQe7I Prosty jonizator powietrza: https://youtu.be/IUuqqRNM5Oo Regulator mocy na triaku, ściemniacz: https://youtu.be/aBZq0GXxVTs Regulowany stabilizator napięcia na mosfecie: https://youtu.be/C5SOt0NxIIo

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