Re: [Csnd-dev] the Hammer of Scanned

Sorry Dev.  I thought I was just responding to Menno.

*- Dr.B*


*Dr. Richard Boulanger*

Professor

Electronic Production and Design

*Berklee College of Music*

Professional Writing & Technology Division


On Mon, Sep 30, 2024 at 7:29 AM tjingboem <[email protected]> wrote:

> I have a question about the hammer setting of the Scanned opcode scanu(2).
>
> Looking at the manual (as i always am), i think there are 5 settings that
> have an influence when the scanu opcode is set to 'hammer' mode:
> 1. set init to negative table --> set to hammer mode
> 2. ileft pluck has influence
> 3. iright pluck has influence
> 4. kposition has influence
> 5. kdisplace has influence.
>
> If the hammer option is not set, all these arguments should not have any
> influence on the sound. Am i correct?
>
> However
> kdisplace always has an influence on the sounding result, even when not in
> hammer mode. Should this be so?
>
> Manual says: *kdisplace* -- power that the active hammer uses.
>
> so i assume this kdisplace should only have an effect if init is in
> negative mode (=hammer).
>
> Or else we should change the text in the manual?
>
> Here is a slightly adapted example from the manual page GEN44 that shows
> this:
>
> <CsoundSynthesizer>
> <CsInstruments>
> sr=44100
> ksmps=32
> nchnls=2
> 0dbfs  = 1
>
> instr scan ;
> a0 init 0
> irate = .01
> kmass line 2,p3,5
> kstiff line 30,p3,45
> kcenter line .08,p3,.01
> kdamp line .01,p3,.08
> kpos line 0,p3,16
>
> ;scanu2
> init,irate,ifndisplace,ifnmass,ifnmatrix,ifncentr,ifndamp,kmass,kmtrxstiff,
> ; kcentr, kdamp, ileft, iright, kpos, kdisplace, ain, idisp, id
> scanu2 p6, irate, 6, 2, 3, 4, 5, kmass, kstiff, kcenter, kdamp, .2, .7,
> kpos, p7, a0, 1, 2
> ;ar scans kamp, kfreq, ifntraj, id
> a1 scans ampdbfs(p4), cpspch(p5), 7, 2
> a1 dcblock2 a1
> outs a1, a1
>
> endin
>
> </CsInstruments>
> <CsScore>
> f1 0 16 10 1         ; sine hammer
> f2 0 16 -7 1 16 1    ; Masses
> f3 0 0 -44
> "/media/datae/CsoundManual7/manual-7.0/examples/string_with_extras-16.matrxT"
>   ; Spring matrices
> f4 0 16 -7 1 16 1    ; Centering force, uniform initial centering
> f5 0 16 -7 1 16 1    ; Damping, uniform damping
> f6 0 16 -7 .01 16 .01 ; uniform initial velocity-displacement
> f7 0 16 -5 .001 16 16 ; Trajectories
>
> i"scan" 0 2 -6 7.00 -1  0       ; hammer & power to 0
> i"scan" 3 2 -6 7.00 1   0       ; normal mode & hammer power at 0
>
> i"scan" 6 2 -6 7.00 -1  .5      ; hammer & power to .5
> i"scan" 9 2 -6 7.00 1   .5      ; no hammer & but power to .5 ; still
> influence??
>
> e
> </CsScore>
> </CsoundSynthesizer>
>