Vocoder

Voice Coder

Note: Kraftwerk used a machine called Votrax (Siemens), its a phonetic Generator, so it is no Vocoder.. but of course they also used vocoders (a lot)..

history

Homer Dudleys VODER is one of the first made (late 1930ies/ very early 1940s) (the vocoder was invented for the war (again) to encode and decode spoken messages..)

english

originally made for coding Voice send it by wire and decode it again (milltary use) but now it is used in music.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.

Voice Coder = Vocoder - analyses frequency ranges from the original and transforms it to another frequency section (vocoder=voice encoder decoder)

deutsch

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.

Real Analog Vocoder

some models.. more about vocoders and what they do.. below..

• Korg VC10 1978/79 - 8 band, not routeable, (D) nicht routbar eg used by Cabaret Voltaire..

• EMS Vocoder 3000 - route-able, 16 band - hi-end!..
• EMS vocoder 5000 with possibility to rearrange the bands and -of course- pin matrix. (the big one)

• Doepfer Vocoder from the A100 System, routeable, (13+2) bands

• MAM VF11 (new one)

Moog Vocoder, routeable, modular, lots of bands and a "slightly" bigger modular one (2 made) Moog Modular Vocoder

• Analog Lab Vocoder (from france, 32 band vocoder but not routable, hi quality - (D) neu, aber gut aus F, 32 band, nicht routbar)

Analog Lab from france, 32 bands with LFO, not too many controls but very good sound quality! very hi-end vocoder (32bands) analog lab vocoder

• Paia Vocoder:

• Roland VP-330 Vocoder Plus 1980 *

Roland vp330 vocoder

and

• Roland SVC350 on top of this rack:
• Roland SPV-355 (no pic)

• Electro Harmonix Vocoder

• Dynacord SRV66 Vocoder

• Sennheiser VSM201

Sennheiser Vocoder VSM201 made in 1978 - this is a luxury 20bands vocoder fully analogue of course only the "creme de la creme" used THIS, because it is really not cheap.. kraftwerk!

manual can be found here: http://home.swipnet.se/cfmd/synths/companies/sennheiser/ as you can see: you can assign all bands freely and tune it!! the "voice coder = vocoder" is not only for "robotic" voices like kraftwerk did. It's also interesting for rhythmic sound sources. you won't worry about speech clearness anymore.. the vocoder was first a military device to encode speech signals.. but now "human kind" uses vocoders for music! also a good thing! vsm201 frequency response http://sequencer.de/pix/analogsynthesizer/sennheiser_vsmFreqband.jpg

• Synthovox

• russian: Electronica EM-26

Related Links

• http://sequencer.de/software_synthesizer/NI_vokator.html
• http://sequencer.de/synthaudio/synthesizer-grundlagen.html#vocoder
• http://www.stoffelshome.de/vocoder/vocoder_daten.html
• http://web.inter.nl.net/hcc/davies/vocpage.htm