oscillator frequencies

laserbeak43 · 16 Jan 2005

ok made my own square wave

not exactly sure how it works but i built it and am still looking at it now as we speak.

-edit1- whats the number of samples in the int field for? -just cut the number in half from 256 to 128 is that for visual purposes only? i assume so but it's just an analyser right?

jorge · 16 Jan 2005

laserbeak43, it's great to see you figuring out stuff like that

whats the number of samples in the int field for?

The analyser compiles machine code corresponding to the poly schematic connected to it. Once the machine code is compiled, the anaylser runs it NS ( NS=number of samples ) times to generate a graph with NS samples. The display shows the graph with all the samples. The yellow dots are the actual samples and they're connected with a blue line. The best way to understand it is if you try it with just a few samples like 16, 32 etc.

jorge · 16 Jan 2005

laserbeak43 wrote: thanks if you can give me some help i'd apreciate it. i might just need to learn some math it seems but i still wouldnt know where to use the math or why so please. tutor me 🙂

I'll do my best to try and help you, dont worry about not knowing enough math, hopefully SM will make it easier for you to learn.

laserbeak43 · 16 Jan 2005

cool thanks for those replies. will look into them some more. do you think you could give me some help on setting frequencies?

and another thing when i turned my square wave into a module the floats were replaced with ins i had added an out too as well. is there a way that i can add the .5 float into the actual module and keep it thereor have phase settings that would keep it at square? [/img]

jorge · 16 Jan 2005

here is how I'd fix your schematic:

at the moment, to use the analyser you need to copy and paste the poly section you want to analyse, you cannot share it with the actual synth. That might change in the future to be more flexible.

To add 0.5 to a poly input connector, just connect a float edit with the value 0.5 to it. Poly input connectors add all the values connected to it, that's why you dont have, and dont need a poly adder component.

laserbeak43 · 16 Jan 2005

but when i make my module the float input.5 and .01 are outside of the actual module

jorge · 16 Jan 2005

laserbeak43 wrote: but when i make my module the float input.5 and .01 are outside of the actual module

and what is the problem with that?

here is my square module:

and here is how you can analyse it:

I hope this screen captures somehow answer your question, if not please let me know exactly what the problem is.

laserbeak43 · 16 Jan 2005

just worried about the fact if i phase it too much it wont be a square anymore

jorge · 16 Jan 2005

laserbeak43 wrote: just worried about the fact if i phase it too much it wont be a square anymore

it wont be a pure square but it will be a pulse with varying width, that's what pwm is. When you add a value to phase, it goes from 0 to 1 and it wraps around the same way that 0 to 360 degrees wraps around. A phase of 1.1 will be the same as a phase of 2.1, 3.1 etc.

laserbeak43 · 16 Jan 2005

laserbeak43 wrote: hi i wasn to know if how i can set the frequency range of the square osc module you guys made for me

the tone channels can produce 1024 different frequencies, ranging from 122Hz to 125kHz.

hehehe could use some help on this gonna have another look through the getting started guide. maybe it's in there i think i remember seeing it

laserbeak43 · 16 Jan 2005

jorge wrote: it wont be a pure square but it will be a pulse with varying width, that's what pwm is. When you add a value to phase, it goes from 0 to 1 and it wraps around the same way that 0 to 360 degrees wraps around. A phase of 1.1 will be the same as a phase of 2.1, 3.1 etc.

sweet thanks so i can start duplicating these once i get the frequency ranges locked in lol sorry just in a humorous mood thanks for all of your help sincerely

jorge · 16 Jan 2005

here is how you can convert values from herts to zero-to-one:

in this example 122 Hertz is being converted to 0.00553288 zeroToOne.

laserbeak43 · 16 Jan 2005

how did you do that math?

jorge · 16 Jan 2005

laserbeak43 wrote: sweet thanks so i can start duplicating these once i get the frequency ranges locked in lol sorry just in a humorous mood thanks for all of your help sincerely

You're welcome. SM seems to have an effect on you, maybe it is too colourful 🙂, or is it the bendy links?

laserbeak43 · 16 Jan 2005

a bit of both hahah it's a really comforting interface to work in. maybe it's because it's all white like the crazy house 🙂

jorge · 16 Jan 2005

laserbeak43 wrote: how did you do that math?

If 22050 Hz corresponds to 1, 11025Hz corresponds to 0.5, x Hz corresponds to x/22050.

jorge · 16 Jan 2005

after reading this whole thread once again, I think you might be trying to implement a fixed square wave rather than a pulse with pwm, if that's the case here is how the square module schematic should be:

laserbeak43 · 17 Jan 2005

just as i saw the mail notification for your post i had just finished mking that with mines. thanks for the reassurance now to take a look at the math example you showed me and figure it out for myself now will the math calculate itself if i were to change the parameters? and where would i assign knobs for the freq and pulsewidth on the floats or the actual freq and pwm inputs(if we were outside of the module)?

laserbeak43 · 17 Jan 2005

sorry just the freq

jorge · 17 Jan 2005

laserbeak43 wrote: will the math calculate itself if i were to change the parameters?

Yes, the new values are updated each time there is a change. The green connectors update each time a value changes while the white Poly connectors update 44100 times per second.

laserbeak43 wrote: and where would i assign knobs for the freq and pulsewidth on the floats or the actual freq and pwm inputs(if we were outside of the module)?

it depends on what you're trying to do, if you want to listen to the sound as you play Midi notes, you need to connect the first output of the MidiToPoly to the freq input of the square module. To control the pwm, if you want it to be constant, you can connect a knob straight to the pwm input of the square module. Although the green Float connector works in a different way to the poly connector ( because it updates only once rather than 44100 per second ) each time you connect a green float to a poly there is a conversion happening in the background so the Float data starts working as if it was poly data. In general do your calculations as much as possible with green data and at the end convert it to poly. You cannot convert poly to green float so whenever you have a calculation section that has poly data as input, the whole calculation will have to use poly components.

laserbeak43 · 17 Jan 2005

added the math is this hooked up right?

laserbeak43 · 17 Jan 2005

so for that math conversion i just posted.. would i have to use a poly multiply to bond the midi to poly and the calculation and then conect it to the freq?

jorge · 17 Jan 2005

laserbeak43 wrote: added the math is this hooked up right?

It doesnt look very right, it depends on what you're trying to do. I think the easiest is if you tell me exactly what you're trying to achieve and I'll post a schematic here.

laserbeak43 · 17 Jan 2005

heheh soorry well i just want the midi notes to be able to trigger notes within that frequency range and them im gonna export a vsti and test out how it sounds before i go on any further 🙂

jorge · 17 Jan 2005

ok, so here is how you'd limit the input frequency to be a minimum of 122Hz.

if you also need to know how to create a VSTi from your schematic let me know.

jorge · 17 Jan 2005

I forgot to say in the previous post that 125Khz is too high a limit, SM only works up to 22050Hz ( assuming you're using a sampling rate of 44100 ), that's why I didnt limit the highest frequency in the schematic of my previous post.

laserbeak43 · 17 Jan 2005

well its an old ic from the 80s that i am trying to emulate it might be just my ignorane but i really dont thing the sample rate is as high as 441

still trying to find the details onthe samplerate tho

jorge · 17 Jan 2005

I'm going to sleep in the next 10 min, I'll try to answer the rest of your posts tomorrow.

laserbeak43 · 17 Jan 2005

thanks alot for your time!!! i'll make only a few posts to not overwhelm you 🙂