Pure Data - Harmonic Partial Filter - Phase 2

Using [vcf~] instead of [bp~] to allow an approximation of partials to be reconstructed as harmonic series for manipulation and exploration into the concept of pitch space. This system does not deal with individual sinusoids, but approximate frequency bands with narrow "Q" factor at specified multiples of a fundamental frequency.

[vcf~] is like [bp~] except it takes an audio signal to set center frequency, which may thus change continuously in time. The "Q" factor or filter sharpness is still only set by messages. More expensive than bp~ in CPU time but more powerful too (vcf~ help file, Pd-ext).

Any partial (fundamental and multiples) may be selected within the constructed series. Each partial may be placed in any desired order. Each partial may be accentuated or attenuated in amplitude by the user.

[sigmund~] tracks the pitch of a selected string or all strings in sequence. One instance of [sigmund~] does not accommodate chordal (simultaneous) structures in real-time. This is not a concern as this system is developed primarily for the study of sequential pitch structures. Once a fundamental frequency is established, [vcf~] apply the relevant "Q" factor level to achieve the fundamentals harmonic series. The user may apply the central frequency of unrelated harmonic series over another tone, to explore inharmonic content, or simply to achieve more percussive tones (as demonstrated toward the end of the video). By accentuating different harmonic and inharmonic content, we may establish macro and micro music structures on each string in relation to a fundamental frequency.

In this instance, notes which coincide with the set harmonic series will be perceived as more resonant. For example, the "A" note played on the second string (chc. 2) is perceived as more resonant as the channel has a frequency of 220hz. Any perceived ringing is a result of a narrow "Q" factor, which the user will be able to adjust to suit their performance style.

Category:

Music

Tags:

• pure data
• harmonic series
• filter
• partial
• guitar
• live performance system

[rivetrenuck]

could i get this as a patch or is there a tutorial on how to build this?

[rickygrahammusic]

@rivetrenuck I intend to release all abstractions in the next few months. But it is very simple to build. Use [sigmund~] to track frequency, and then a series of [vcf~] to build the harmonic series. You can control the Q factor as you wish. More info on my website.

[bass109]

Jesus is future king of earth, repent for his judgement comes. Jesus loves you

[evengravy]

like this ricky, JohnH