shape filter

[DERF]

Hello.
Thank you.
From the code of the plugin we can write for example:

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(defun quantable (val)
  (setq val   (round  (- 104 val)))
 (abs-env
  (quantize (pwlv -1 2 1 2.1 1)  val)))

(abs-env
  (shape (osc 55)(quantable 100) 1.0))


We observe that the sound result can be different only by changing the value of "val" one or two units.
But, there is something that I does not understand. What is the utility to use the function ROUND?
If we not use not this function, the sound result, the tone quality of the sound wave is the same.
It is strange.
Beforehand thank you for your answer.

[steve]

What is the utility to use the function ROUND?

http://www.cs.cmu.edu/~rbd/doc/nyquist/ ... l#index337

The "steps" argument of "quantize" must be an integer: http://www.cs.cmu.edu/~rbd/doc/nyquist/ ... l#index566

[DERF]

Thank you.
I would like to quote the NYQUIST Reference Manual (chapter: Table-Lookup Oscillator Functions).
R B Danneberg indicates that we can also use functions (snd-... for exemple (snd-fmosc
There is a problem with this function.
I write this code:

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(abs-env (normalize
(snd-fmosc (osc 69)   *sound-srate*  440 0. 5 90) ))

The manual indicates for this function:(snd-fmosc s step sr hz t0 fm phase)
It is thus necessary to give a value for the parameter "phase".
The problem is the following one: it is impossible to give a value which Nyquist prompt accepts.

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error: bad argument type - 90
Function: #<Subr-SND-FMOSC: #aaca608>
Arguments:
  #<Sound: #b2eb6b8>
  44100
  440
  0
  5
  90
Function: #<FSubr-PROGV: #aacad98>
Arguments:
  (QUOTE (*WARP* *LOUD* *TRANSPOSE* *SUSTAIN* *START* *STOP* *CONTROL-SRATE* *SOUND-SRATE*))
  (LIST (QUOTE (0 1 NIL)) 0 0 1 MIN-START-TIME MAX-STOP-TIME *DEFAULT-CONTROL-SRATE* *DEFAULT-SOUND-SRATE*)
  (NORMALIZE (SND-FMOSC (OSC 69) *SOUND-SRATE* 440 0 5 90))
1>

My question is the following one: is there a bug?
Beforehand thank you for your help.

[steve]

The bugs are in your code:

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(snd-fmosc s step sr hz t0 fm phase)

You have missed out the "step" parameter, and "fm" must be a sound.

R B Danneberg indicates that we can also use functions (snd-...

He also says: "You should use fmosc instead "
http://www.cs.cmu.edu/~rbd/doc/nyquist/ ... l#index788

[DERF]

Hello.
Please read this code.

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(defun wiggle (val)
  (setq val (+ 0.5 (round (/ val 10.0))))
  (abs-env (lfo val 2)))

(abs-env
  (shape (osc 55)(wiggle 100) 1.0)))

This code generates a sound wave with the distortion. I observed the sound wave. It is complex in certain places.
If we zoom a lot, we observe that samples appears in a mess to the passages where the wave is the least regular.
I ask myself this novice's question: why is the generated wave so bitter? Does it come because the generated wave is complex?

Beforehand, thank you for your answer.