Hi,

All I hear is a simple sine wave. Based on what I've seen in the
Csound Book this should work. I'm totally mystified why I can't get
this to work.  There has got to be some insanely simple reason that
I'm just not seeing.  If someone would take a moment to help with
this, I'd really appreciate it!

Charles




sr = 44100
ksmps = 64
nchnls = 2
0dbfs  = 1

     instr 1

icps cpsmidi

iamp ampmidi 1
aenv linenr iamp, .01, .1, .01

amod oscili 1, .25*icps, 1
acar oscili 1, icps+amod, 1

asig = acar*.25*aenv
outs asig, asig

     endin




f1 0 16384 10 1
i1 0 32000
e




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on 2011-12-19 at 21:00 Charles Gran wrote:


>All I hear is a simple sine wave.

[..]

>amod oscili 1, .25*icps, 1
>acar oscili 1, icps+amod, 1


the modulator has an amplitude of 1, meaning that amod will vary between
+-1. adding +-1 Hz to icps will hardly be noticeable...

the amplitude of amod has to be the frequency deviation d, that is the
modulating index I times the modulating frequency (icps*.5 in your case)

try something like this:

index	=	3	; or whatever you like... typical values < 5
ifm	=	icps*.25	; modulating frequency
idev	=	index*ifm	; frequency deviation

amod	oscili	idev, ifm, 1
acar	oscili	1, icps+amod, 1


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> the modulator has an amplitude of 1, meaning that amod will vary between
> +-1. adding +-1 Hz to icps will hardly be noticeable...

Thanks! For the amplitude, if 0dbfs = 1, then isn't 1 full scale amplitude?


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it is, but as luis said, the amplitude of the modulator has nothing to
do with any amplitude to listen to. the amplitude of the modulator is
the amount of hertz which is added (and subtracted because of the
negative values) continuously to the carrier frequency. if you replace
your line
amod oscili 1, .25*icps, 1
by
amod oscili 100, .25*icps, 1
you should hear the effect.
hope this helps -
	joachim



Am 20.12.2011 05:28, schrieb Charles Gran:
>> the modulator has an amplitude of 1, meaning that amod will vary between
>> +-1. adding +-1 Hz to icps will hardly be noticeable...
> 
> Thanks! For the amplitude, if 0dbfs = 1, then isn't 1 full scale amplitude?
> 
> 
> Send bugs reports to the Sourceforge bug tracker
>             https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
> 
> 


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on 2011-12-19 at 22:28 Charles Gran wrote:

>Thanks! For the amplitude, if 0dbfs = 1, then isn't 1 full scale
>amplitude?

yes, but that's something completely different. 0dbfs determines what
value csound will take as full scale amplitude when sending a signal to
audio output. but number 1 is number 1. if your oscili has an amplitude of
1, amod will vary between +1 and -1, whatever 0dbfs you have. adding that
to acar means that your carrier signal will vary 1 Hz above and below its
center frequency.

again, the amplitude of the modulator has to be d = I*fm, being I the
modulation index, and fm the modulation frequency.

best,


lj


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