How to improve this .uhm?

[hakey]

The attached .uhm wavetable uses two bandpass filter functions in parallel to give two formants in a matrix that can be swept independently for different vowel sounds (set Tables to 8 and assign WT Position and WT Multi Pos to the X and Y of an XY - theoretically, every vowel sound and dipthong should be in there).

The first formant sweeps from 0.14 to 0.28, the second 0.28 to 0.49, which corresponds to 280 to 800 (F1) and 800 to 2600 Hz (F2) at C3.

The number of lines of code can probably be reduced a bit. Any ideas?

Formant Matrix.zip

[Urs]

I don't have Hive in front of me right now, but it looks much like you could reuse the envelope built into uhm to create the repeating pattern of bandpass frequencies.

Envelope L0=0.14 T1=1 L1=0.16 T2=2 L2=0.18 ... T7=7 L7=0.28
Wave target=aux1 start=0 end=7 "bandpass(2*phase-1, env(frame), 0.9)"

You can also use the Move instruction to copy already created frames, which is much faster than always using the same bandpass. That is, first you create frames 0 to 7, then you do the rest like this:

Move source=aux1 target=aux1 start=0 end=7 to=8 // creates 8-15
Move source=aux1 target=aux1 start=0 end=15 to=16 // creates 16-31
Move source=aux1 target=aux1 start=0 end=31 to=32 // creates 32-63

The second set of formants I'd do pretty much like you did them. If the file loads slowly, maybe also use the Move command to create the copies, even if it makes the file longer.

[hakey]

I now have

Code: Select all

Info "Set Tables to 8"

NumFrames =64

Envelope L0=0.14 T1=1 L1=0.16 T2=2 L2=0.18 T3=3 L3=0.20 T4=4 L4=0.22 T5=5 L5=0.24 T6=6 L6=0.26 T7=7 L7=0.28
Wave target=aux1 start=0 end=7 "bandpass(2*phase-1, env(frame), 0.9)"

Move source=aux1 target=aux1 start=0 end=7 to=8 
Move source=aux1 target=aux1 start=0 end=15 to=16
Move source=aux1 target=aux1 start=0 end=31 to=32

Wave target=aux2 start=0 end=7 "bandpass(2*phase-1, 0.28, 0.9)"
Wave target=aux2 start=8 end=15 "bandpass(2*phase-1, 0.31, 0.9)"
Wave target=aux2 start=16 end=23 "bandpass(2*phase-1, 0.34, 0.9)"
Wave target=aux2 start=24 end=31 "bandpass(2*phase-1, 0.37, 0.9)"
Wave target=aux2 start=32 end=39 "bandpass(2*phase-1, 0.40, 0.9)"
Wave target=aux2 start=40 end=47 "bandpass(2*phase-1, 0.43, 0.9)"
Wave target=aux2 start=48 end=55 "bandpass(2*phase-1, 0.46, 0.9)"
Wave target=aux2 start=56 end=63 "bandpass(2*phase-1, 0.49, 0.9)"

Wave "aux2 +aux1"

Normalize base=all

The formant in aux1 isn't there any longer. What have I missed?

[Urs]

good question! I have to check it out when I get in front of a setup... (currently on vacation, haven't set up a desk yet)

[hakey]

No worries.

A question on the envelope: T1, T2... etc are time values - what are they the time of? Is it a frame, so that T1 = 1 = 1 frame, or 2048 samples?

[hakey]

...oops, missed the bit about being on vacation. Don't worry about it.

[Urs]

You decide what the input value is, in the parameter you call env() with. I just don’t remember if it’s relative or absolute “time”. It’s usually not time though. It’s more of a curve that can be mapped.

[Urs]

(The concept of vacation is unknown to me, except for the best vacation ever - glamping at Uluru - which has lasted for 2 days without internet connection and two visits to the field of lights)

[hakey]

Ah, I get how the envelope works.

The original .uhm works okay - seems to load quickly enough. I just thought it probably wasn't the most efficient way to code it. Will have a play around and see if I can find out why your envelope suggestion didn't work.

Enjoy your holiday!

[hakey]

Sorry, a few more questions.

I tried the following envelope example from the scripting doc:

Code: Select all

Envelope curve=exponential L0=0 T1=0.25 L1=1 T2=0.5 L2=-1 T3=0.25 L4=0

Wave ”env(phase)”

Loading the wavetable in Hive all that happens is that it keeps the first frame of whatever wavetable was previously loaded - no sign of the fin/triangle that it should make?

Probably just an oddity, but "Additive Chords" from the factory wavetables seems to be missing a closing apostrophe around the formula in line 8, yet it works?

Code: Select all

// by Howard Scarr

Info "5th, 7th, 4th, add9, major triad, maj7"

NumFrames = 6

Wave "0 + sin(2*pi*phase*(frame+1))"
Wave "x + sin(2*pi*phase*(frame+4))
Wave "x + sin(2*pi*phase*(frame+6))"

Normalize db=0 base=each

And, silly question, but what is 'x' here and in the other uhm's that use 'x' (I can't find a definition in the scripting doc)?

[cytospur]

x is the output from the previous Wave instruction.

[hakey]

x is the output from the previous Wave instruction.

okay, thanks.

(should have read the scripting doc more carefully - 'x' is listed under 'variables')

[Howard]

Probably just an oddity, but "Additive Chords" from the factory wavetables seems to be missing a closing apostrophe around the formula in line 8, yet it works?

Oops...