Model-Based Sound Synthesis of the Guqin
(1) Laboratory of Acoustics and Audio Signal Processing
Helsinki University of Technology
(2) Centre for Music and Technology,
(3) Institute for Psychoacoustics and Electronic Music,
Department of Musicology,
This paper presents a model-based sound synthesis algorithm for
the Chinese plucked string instrument called the guqin. The
instrument is fretless, which enables smooth pitch glides from a
note to another. A version of the digital waveguide synthesis
approach is used, where the string length is time-varying and its
energy is scaled properly. A body model filter is placed in
cascade with the string model. Flageolet tones are synthesized
with the so called ripple filter structure, which is an FIR comb
filter in the delay line of a digital waveguide model. In
addition, signal analysis of recorded guqin tones is presented.
Friction noise produced by gliding the finger across the
soundboard has a harmonic structure and is proportional to the
gliding speed. For pressed tones, one end of a vibrating string is
terminated either by the nail of the thumb or a fingertip. The
tones terminated with a fingertip decay faster than those
terminated with a thumb. Guqin tones are slightly inharmonic and
they exhibit phantom partials. The synthesis model takes into
account these characteristic features of the instrument and is
able to reproduce them. The synthesis model will be used for rule
based synthesis of guqin music.
A manusript has been sent to the Journal of the Acoustical Society of America to be reviewed.
| PACS numbers
Recorded guqin playing. Falling Leaves Dancing In The Autumn Wind played by Henbing Li.
The piece uses slides and flageolet sounds.
Recorded flageolet tones. Recroded harmonics 2, 3, 4, 5, 6, and 7, for string no. 4.
Synthesized flageolet tones. Synthesized harmonics 2, 3, 4, 5, 6, 7, and 8, for string no. 4.
Building up friction and body model of the guqin synthesizer I.
The friction model is use, but the body model filter is not.
Building up friction and body model of the guqin synthesizer II.
Both the friction model and the body model filter are in use.
Building up the string model of the guqin synthesizer.
: (1) Recorded, (2) Synth - Harmonic, (3) Synth - Inharmonic, (4) Synth - Inharmonic + Phantoms, (5) Recorded.
Synthesized playing. The guqin synthesizer playing a piece of music with sliding of tones.
Pronounciation of guqin. The correct way to pronounce the name of the instrument.