[haskell art] [ANN] HDF

[Rohan Drape]

Dear List,

HDF is simple compiler for writing uniform rate data flow graphs.

"Berlin 1977" in "HDF 2006".

let clock_rate = 9
clock_time = 1 / clock_rate
clock = impulse clock_rate 0
tr = trigger clock
note = sequ 0 [55,60,63,62,60,67,63,58] tr
tr_16 = pulse_divider tr 16 0
note' = sequ 1 [-12,-7,-5,0,2,5] tr_16 + note
freq = midi_cps note'
env = decay2 clock (0.05 * clock_time) (2 * clock_time)
amp = env * 0.1 + 0.02
filt = env * (sin_osc 0.17 0 * 800) + 1400
pw = sin_osc (mce2 0.08 0.09) 0 * 0.45 + 0.5
s = lf_pulse freq 0 pw * amp
in out (comb_n [0,1] 0.2 (rlpf s filt 0.15) (mce2 0.2 0.17) 1.5)

HDF generates C code.

HDF graphs can be dynamically loaded into a running SuperCollider unit generator, or into a running JACK process.

HDF is announced (belatedly) because it may be a useful starting point for writing either:

- a SuperCollider-like notation for FAUST
- a SuperCollider unit generator that dynamically loads FAUST graphs

Archive: http://rd.slavepianos.org/t/hdf
RDL: http://rd.slavepianos.org/sw/sc3-rdu/help/rdl.help.lhs

Regards,
Rohan