Loch (computer music)
by Nicholas Hender (2001)
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Library shelf no. CD 1326 [Available for loan]
Loch represents a movement in sonic experimentation as a means of exploring the specific areas of tuning and texture in music. This is done through the use of creative synthesis: a source signal, generated by frequency modulation, is passed through a bank of bandpass filters, the centre frequency of each oscillating at a sub-audio rate (<20Hz). The bandwidth of each filter is such that only one component frequency (or partial) of the original source signal can pass through, resulting in each bandpass filter gliding back and forth across groups of sequential pitches. This constitutes the audible deconstruction of a single complex tone. As the modulation ratio of the original source signal is a whole number at only the beginning and ending of the piece, every other section of the piece is inharmonic, with the groups of sequential pitches naturally changing their tuning to reflect this.
Instrumentation: Computer (Csound).
Duration: 8 min.
Difficulty: N/A - Not for live performance
- In the form/style of: Minimalism
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