Vocoder: Unterschied zwischen den Versionen
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Voice Coder | Voice Coder | ||
originally made for coding Voice send it by wire and decode it again (milltary use) but now it is used in music. it is a [[Filterbank]] (synthesis and analysis part) with 8 or more bands and a a voiced / unvoiced detector. each band will be "scanned" by an [[envelope-follower]] witch only listens to a certain range of audio. the synthsis part produces a noise signal which is filtered by ([[BPF]]) (one per band plus one [[HPF]] / [[LPF]] at the lowest / highest end of the band. | originally made for coding Voice send it by wire and decode it again (milltary use) but now it is used in music. it is a [[Filterbank]] (synthesis and analysis part) with 8 or more bands and a a voiced / unvoiced detector. each band will be "scanned" by an [[envelope-follower]] witch only listens to a certain range of audio. the synthsis part produces a noise signal which is filtered by ([[BPF]]) (one per band plus one [[HPF]] / [[LPF]] at the lowest / highest (or better upper and lowest) end of the band. | ||
Version vom 4. Januar 2007, 19:18 Uhr
Voice Coder
originally made for coding Voice send it by wire and decode it again (milltary use) but now it is used in music. it is a Filterbank (synthesis and analysis part) with 8 or more bands and a a voiced / unvoiced detector. each band will be "scanned" by an envelope-follower witch only listens to a certain range of audio. the synthsis part produces a noise signal which is filtered by (BPF) (one per band plus one HPF / LPF at the lowest / highest (or better upper and lowest) end of the band.
was ist ein Vocoder? (zB ems vocoder, sennheiser, roland, vokator (native instruments)) hier werden egal ob analog oder digital 2 teile aktiv: analyse und synthese teil. analyse: hier gibt es so viele BPFs wie bänder minus 2: denn oben und unten sitzen einfach ein HPF und auf der anderen seite des frequenzbandes ein LPF. was tut er? er analysiert die entsprechenden signale, die hier noch durchkommen frequenzselektiv. nun kann man das ganze dem syntheseteil zuführen: aber man muss ja nicht dieselben BPFs nehmen, sondern könnte zB die bänder vertauschen.. die idee stammt übrigens bekanntlich aus der millitärtechnik um sprache zu verschlüsseln.
(vocoder=voice encoder decoder)
