In order to better appreciate the musical qualities of the Karplus-Strong plucked string algorithm,
convert the algorithm to a virtual musical instrument (VMI for short)
that can be played by "MIDI Jam Session." If necessary, visit
MIDI Jam Session, download the application VI .zip file, and view the
screencast video in that module to learn more about the application and how to create your
own virtual musical instrument. Your VMI will accept parameters that specify
frequency, amplitude, and duration of a single note, and will produce a corresponding array of
audio samples using the Karplus-Strong algorithm described in the previous section.
For best results, select a MIDI music file that contains a solo instrument or perhaps a duet.
For example, try "Sonata in A Minor for Cello and Bass Continuo" by Antonio Vivaldi.
A MIDI version of the sonata is available at the
Classical Guitar MIDI Archives, specifically
Vivaldi_Sonata_Cello_Bass.mid.
Try experimenting with the critical parameters of your instrument, including sampling frequency and
the low-pass filter constant
g
g
MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYb1uaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbba9q8WqFfea0=yr0RYxir=Jbba9q8aq0=yq=He9q8qqQ8frFve9Fve9Ff0dmeaabaqaciGacaGaaeqabaWaaeaaeaaakeaacaWGNbaaaa@3633@
. Regarding sampling frequency: lower sampling frequencies influence
the sound in two distinct ways -- can you describe each of these two ways?
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