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Issue with line function at 44100 sampling

Date2005-10-15 18:34
From"Barry Griffin (sent by Nabble.com)"
SubjectIssue with line function at 44100 sampling
Hi,

I have the following csound code -

sr       = 44100
kr       = 4410
ksmps    = 10
nchnls   = 2

instr    1
a1 line p5, p3, p6
outs a1, a1*0
endin

instr    2
a1 line p5, p3, p6
outs a1*0, a1
endin

f1 0 4096 10 1

i1 0.0 0.01 80 0 2000
i1 0.01 0.01 80 2000 4000

i2 0.0 0.02 80 0 4000

e

For some reason, I do not get the exact same signal in each channel with this code, can anyone tell me why?

If I change the sampling rates as follows -

sr       = 40000
kr       = 4000

then I do get the same signal in each channel.

I'm using CSoundAV.

Thanks for your help,

Barry.


Sent from the Csound - General forum at Nabble.com.
Date2005-10-15 19:11
FromIstvan Varga
SubjectRe: Issue with line function at 44100 sampling
Barry Griffin (sent by Nabble.com) wrote:

> For some reason, I do not get the exact same signal in each channel with 
> this code, can anyone tell me why?

This can be the result of limited floating point accuracy, or even
more likely the fact that all note timings are rounded to integer
multiples of 1/kr seconds. You cannot have a note with a start time
or duration of exactly 0.01 seconds at kr=4410, because it would be
non-integer (44.1) control periods.