Subharchord II
Berlin (GDR) 1968
135 x 100 x 75 cm, ca. 90 kg
Metal, plastic, keyboard, control generator, vibrato and tremolo generator, binary frequency divider, subharmonic frequency divider, mel filter, noise generator, sinus generator, ring modulator, semiconductor technology

Video: Peter Donhauser über das Subharchord II

The keyboard, designed to react to pressure in order to regulate volume, has a pitch range of three octaves and controls a main generator. The latter, by dividing the frequencies in a ratio of 2:1, generates seven octaves for each key (1’ to 64’), hence a total of ten octaves per keyboard. The subharmonic mixtures are produced by four secondary generators whose frequencies are generated by dividing the frequency of the main generator (1/2 to 1/29). Mel and formant filters as well as ring and choir modulators in interaction with the mixtures allow the creation of a wide variety of timbres.