How can i silence this?

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How can i silence this?

Permanent link to this post Posted by Flavioweb » Wed Nov 09, 2016 8:00 pm

I need to silence (extactly at zero!) the central "noise" of this -sound-.
This "noise to silence" is present in other places in the audio track...
How can i do this (automagically) with Nyquist?
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Flavioweb
 
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Re: How can i silence this?

Permanent link to this post Posted by steve » Wed Nov 09, 2016 8:29 pm

I'm not sure exactly what you are wanting to do, but I'm guessing that a "noise gate" is the effect you are looking for: http://wiki.audacityteam.org/wiki/Nyqui ... Noise_Gate
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)
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Re: How can i silence this?

Permanent link to this post Posted by Flavioweb » Wed Nov 09, 2016 8:38 pm

Ok...
I have already made some attempts ... but i could not do anything useful...
Is possible to use GATE or NOISE-GATE inside a Nyquist "script"?
Can you explain me how to do it...?
I still have only errors...
Code: Select all
(noise-gate (highpass8 *track* 3000))

gives me
Code: Select all
break: lookahead must be greater than risetime in GATE function
if continued: return from BREAK
Function: #<Subr-BREAK: #4a44198>
Arguments:
  "lookahead must be greater than risetime in GATE function"
Function: #<FSubr-COND: #4a42a40>
Arguments:
  ((< LOOKAHEAD RISETIME) (BREAK "lookahead must be greater than risetime in GATE function"))
  ((OR (< RISETIME 0) (< FALLTIME 0) (< FLOOR 0)) (BREAK "risetime, falltime, and floor must all be positive in GATE function"))
  (T (LET ((S (SND-GATE (SEQ (CUE SOUND) (ABS-ENV (S-REST LOOKAHEAD))) LOOKAHEAD RISETIME FALLTIME FLOOR THRESHOLD))) (SND-XFORM S (SND-SRATE S) (SND-T0 SOUND) (+ (SND-T0 SOUND) LOOKAHEAD) MAX-STOP-TIME 1)))
Function: #<Closure-GATE: #2e844c8>
Arguments:
  #<Sound: #2d3d698>
  0.01
  0.02
  0.5
  0.5
  0.0001
Function: #<FSubr-LET: #4a3e328>
Arguments:
  ((RMS (LP (MULT SND SND) (/ *CONTROL-SRATE* 10))))
  (SETF THRESHOLD (* THRESHOLD THRESHOLD))
  (MULT SND (GATE RMS FLOOR RISETIME FALLTIME LOOKAHEAD THRESHOLD))
Function: #<Closure-NOISE-GATE: #2e36bf8>
Arguments:
  #<Sound: #2d3d788>
1>

I found this in manual
(noise-gate sound [lookahead risetime falltime floor threshold]) [LISP]
A simple noise gate implementation based on gate. All parameters except snd are optional and default values are lookahead: 0.5, risetime: 0.02, falltime: 0.5, floor: 0.01, threshold: 0.01. The result is the input snd, where below-threshold segments of sound are silenced.
Flavioweb
 
Posts: 11
Joined: Fri Nov 04, 2016 8:23 pm
Operating System: GNU/Linux other

Re: How can i silence this?

Permanent link to this post Posted by steve » Wed Nov 09, 2016 9:39 pm

Crossed posts. Please see my previous reply. If you want to make your own "gate", the Noise Gate in the link may be instructive.
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)
steve
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Joined: Sat Dec 01, 2007 11:43 am
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