Rocky

Hi, i recently posted help for waves and after looking at buffer-pat it has helped, but i am really stuck on the expr function and i cannot find the equations for square / triangle waves that make sense to me (dumb) so far i think i have a sine wave and cosine

Sine - expr (sin(($f1/512. )* (2. * 3.1415926)))

Cosine - expr 0.75 * (0.25+ cos((3.14159 *2* $f1)))

any help / push in right direction would be much appreciated and also any other waves that could be useful for a synthesiser?

Sine - expr (sin(($f1/512. )* (2. * 3.1415926)))
Cosine - expr 0.75 * (0.25+ cos((3.14159 *2* $f1)))

any help / push in right direction would be much appreciated and also any other waves that could be useful for a synthesiser?
Thanks!!


nebie-needs-help

or just stay in MSP land? MSP will probably be more useful for 

On Nov 21, 2006, at 9:28 AM, Freddy wrote:

> Hi, i recently posted help for waves and after looking at buffer- 

> pat it has helped, but i am really stuck on the expr function and i 

> cannot find the equations for square / triangle waves that make 

> sense to me (dumb) so far i think i have a sine wave and cosine

> Sine - expr (sin(($f1/512. )* (2. * 3.1415926)))

> Cosine - expr 0.75 * (0.25+ cos((3.14159 *2* $f1)))

> any help / push in right direction would be much appreciated and 

> also any other waves that could be useful for a synthesiser?

or just stay in MSP land? MSP will probably be more useful for  
building synth related stuff.

>
> Hi, i recently posted help for waves and after looking at buffer- 
> pat it has helped, but i am really stuck on the expr function and i  
> cannot find the equations for square / triangle waves that make  
> sense to me (dumb) so far i think i have a sine wave and cosine
>
> Sine - expr (sin(($f1/512. )* (2. * 3.1415926)))
> Cosine - expr 0.75 * (0.25+ cos((3.14159 *2* $f1)))
>
> any help / push in right direction would be much appreciated and  
> also any other waves that could be useful for a synthesiser?
> Thanks!!


how can u use msp only? sorry im new to this

i have been told to use expr to create all the waves and im really stuck :(

Triangle waves and square waves are mathematically expressed as sums of sine waves so it would be quite difficult to use expr to deal with these. For instance (i think i'm right on this, but if i have it the wrong way round i sure some one will correct me) a square wave would be the sum of sinx, sin3x, sin5x, ... , sin(2n+1)x, i.e. the odd harmonics.

Max and MSP are two sets of commands with in the program; msp commands have a tilde (~). I hardly ever use the MSP commands, because i usually use max for Midi stuff and never for sound generation. So i stay on the Max side - but if you want to generate waveforms then you need to use an oscillator which is MSP. I always think: MSP = audio, Max = MIDI.

Triangle waves and square waves are mathematically expressed as sums of sine waves so it would be quite difficult to use expr to deal with these.  For instance (i think i'm right on this, but if i have it the wrong way round i sure some one will correct me) a square wave would be the sum of sinx, sin3x, sin5x, ... , sin(2n+1)x, i.e. the odd harmonics.
Max and MSP are two sets of commands with in the program; msp commands have a tilde (~).  I hardly ever use the MSP commands, because i usually use max for Midi stuff and never for sound generation.  So i stay on the Max side - but if you want to generate waveforms then you need to use an oscillator which is MSP.  I always think: MSP = audio, Max = MIDI.
Hope that helps!


On 21-Nov-2006, at 17:12, Tom Giles wrote:

> Triangle waves and square waves are mathematically expressed as 

> sums of sine waves so it would be quite difficult to use expr to 

> deal with these. For instance (i think i'm right on this, but if i 

> have it the wrong way round i sure some one will correct me) a 

> square wave would be the sum of sinx, sin3x, sin5x, ... , sin(2n+1) 

There is more than one way to skin these cats.

While you can express a square wave as a sum of an (infinite) number 

of sines (thank you Jean Baptiste Joseph Fourier), a more pragmatic 

Where fract() is the fractional part, a function with the range [0 .. 1)

This is straight-forward to patch in Max or MSP. There are patches 

doing this in the Tutorials and in the examples/ folder.

A similar approach for a triangular wave is left as an exercise.

Whatever you do, do not examine the objects tri~, rect~, saw~, 

phasor~ or read their .help files. They'll show you dead simple ways 

Peter Castine +--> Litter Power & Litter Bundle for Jitter

Interface Building for |home | chez nous|

Max/MSP Extremely cool |bei uns | i nostri|

On 21-Nov-2006, at 17:12, Tom Giles wrote:
> Triangle waves and square waves are mathematically expressed as  
> sums of sine waves so it would be quite difficult to use expr to  
> deal with these.  For instance (i think i'm right on this, but if i  
> have it the wrong way round i sure some one will correct me) a  
> square wave would be the sum of sinx, sin3x, sin5x, ... , sin(2n+1) 
> x, i.e. the odd harmonics.

While you can express a square wave as a sum of an (infinite) number  
of sines (thank you Jean Baptiste Joseph Fourier), a more pragmatic  
approach is

This is straight-forward to patch in Max or MSP. There are patches  
doing this in the Tutorials and in the examples/ folder.

Whatever you do, do not examine the objects tri~, rect~, saw~,  
phasor~ or read their .help files. They'll show you dead simple ways  
of dealing with these tasks.

--------------    http://www.bek.no/~pcastine/Litter/    -------------
Peter Castine             +--> Litter Power & Litter Bundle for Jitter
                                Universal Binaries on the way
iCE:  Sequencing,  Recording &
       Interface  Building  for                   |home    | chez nous|
       Max/MSP   Extremely cool                   |bei uns |  i nostri|
       http://www.dspaudio.com/                   http://www.castine.de

> how can u use msp only? sorry im new to this

> i have been told to use expr to create all the waves and im really stuck :(

For the basic waves you don't need to calculate, though you could. A 

triangle is a counter up and down, a square is an number of samples on 1 

and another on -1. (In both cases no expr needed)

(Some advises are mathematically correct, but practicaly...)

But there are all the basic synth oscillators as standard MSP externals 

around. If you create a new box, the menu has even a MSP synthesis 

section. just look at all the help files for them (...cycle~, rect~, 

Freddy wrote:
> how can u use msp only? sorry im new to this
>
> i have been told to use expr to create all the waves and im really stuck :(

For the basic waves you don't need to calculate, though you could. A 
triangle is a counter up and down, a square is an number of samples on 1 
and another on -1. (In both cases no expr needed)

But there are all the basic synth oscillators as standard MSP externals 
around. If you create a new box, the menu has even a MSP synthesis 
section. just look at all the help files for them (...cycle~, rect~, 
tri~, phasor~...)

-- 
Stefan Tiedje------------x-------
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Nebie needs help