|Advanced Audio Recording|
Generation of generic MIDI Data with a DSP
page describes an approach to create
sound patterns from music rhythms described by mathematical
equations. The idea behind this is to easily define music for long
term applications like video games without describing every note
in detail but getting flexible and interesting music though
without many repetitions. The first project like this had been
done with my DSP Platform.
The process starts with random selection of predefined sound and rhythm patterns know from trance and dance music in the first place which cover beginnings, middle phrases, soli and endings. For any track in the setup a different point of start is chosen. Modifiers are applied in order to put dynamics and emphasis to the tracks to support the musical meaning. Patters are selected with a randomly progressing counter defining the number of tone, part and time index.
Let equations do the work
For instance Amplitude (n,t) = 1 + k * sin ( (w + n/U) * t * (1+
n/W)) defines a continuously changing amplitude for all of the
pattern tracks being dependent on the parameters W and U.
The qualifier PatternOn (p,n,t) = random() + PatternOn (p,n,t-1) +
PatternOn (p,n+1,t-1) + PatternOn (p,n-1,t-1) defines if a pattern
is set to "on" = playing or not according to a random number, taking
into account the former states of the adjacent channels. This leads
to a higher probability for tracks to be activated in case there is
Adding dynamics to sound tracks
With modification qualifiers m=f(t,p) and p=f(t,m,k) the
sound tracks are synthesized distinguishing between solo tracks,
accompaniment tracks, lead music and supporting tracks for synths.
Also bass drums and drums are handled this way. SoundTrack (m,n,t,k)
= PatternIs (n,t) * MaskIs (m, k,t) will cutout MIDI notes for any
of the tracks according to the particular mask and pattern used.
By using special masks with repetitive windows, arpeggio notes can be created from dynamically created tracks, which were the result of a track bouncing of groups of channels.
Obtaining the finalized MIDI
Finally the MIDI channels are created from the tracks:
Sound Demos of synthesized music
Listen to a demo sound here : ARPDANCE
Read an article how to create MIDI with a DSP-System
|© 2001 - Jürgen Schuhmacher|