Zvuk Flashcards

1
Q

co je zvuk

A

zvuk je mechanicke vlnenie prenasane vzduchom
ludske ucho vnima frekvenciu 20 000 Hz
zvuk pod 20k Hz- infrazvuk
zvuk nad 20kHz- ultrazvuk

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2
Q

zvukove formaty

A

WAV- nekomprimovany subor, pouziva sa pri hudbe na CD, 1 min zaznamu=10 MB
MIDI- komunikacia s hud. nastrojmi, uchovava poznamky, velmi male subory, iba pre profesionalnych hudobnikov
MP3- prenos suborov po internete, stratova komp., 11x mensi ako WAV
WMA- lepsia kompresia ako MP3, umoznuje zaznam priestoroveho zvuku, DVD prehravace
AU- standard format, v Apple Macintosh, CD, PC, autoradio
RA- komercny format, vacsia komp. ako u MP3, internetove radia

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3
Q

Digitalizacia zvuku

A
  • zvuk- analogova informacia= sinusoida
  • AID- analogovo-digitalny prevodnik
  • forma kdovania- PCM
  • proces digitalizacie- vzorkovanie
    - kvantovanie
    - kodovanie
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4
Q

Kolko MB zaberie zvukova nahravka (bez komp.), ak trva 1 min a je v CD kvalite

A

60sx 2 (stereo)x44100 (CD kvalita)x16b= 10 584 b= 10 MB

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5
Q

Jano ma orchestralnu nahravku dlhu 1 minutu a 20s ( bez komp.), je v DVD kvalite 5.1. Kolko MB potrebuje mat volnych na USB ak ju tam chce dat.

A

80sx6( 5.1)x 192000 (dvd kvalita)x24 (tiez DVD kvalita)= 236 MB

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