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i am having a whale of a time trying to measure the time between zero crossings in a wave form (in samples).

everytime i think i get close i realise it relies on bangs.. and bangs don't seem accurate enough :( after all you can fit 44 samples between bangs... more or less :)

basically what i want to do is, have any wave input (complex, sine whatever), then measure the time between every time it crosses zero..( the y-axis i suppose)....

everytime i think i get close i realise it relies on bangs.. and bangs don't seem accurate enough :( after all you can fit 44 samples between bangs...  more or less :)

time-between-zero-crossings

can anyone suggest a method to help me ?? :)

can anyone suggest a method to help me ??  :)


Here are some ideas (for real time, and for non real time analyse on a 

> i am having a whale of a time trying to measure the time between 

> zero crossings in a wave form (in samples).

> everytime i think i get close i realise it relies on bangs.. and 

> bangs don't seem accurate enough :( after all you can fit 44 samples 

> basically what i want to do is, have any wave input (complex, sine 

> whatever), then measure the time between every time it crosses zero.. 

Centre de Recherches et de Formation Musicales de Wallonie asbl

Here are some ideas (for real time, and for non real time analyse on a  
buffer)

>
> hi,
>
> i am having a whale of a time trying to measure the time between  
> zero crossings in a wave form (in samples).
>
> everytime i think i get close i realise it relies on bangs.. and  
> bangs don't seem accurate enough :( after all you can fit 44 samples  
> between bangs...  more or less :)
>
> basically what i want to do is, have any wave input (complex, sine  
> whatever), then measure the time between every time it crosses zero.. 
> ( the y-axis i suppose)....

_____________________________
Patrick Delges

Centre de Recherches et de Formation Musicales de Wallonie asbl
http://www.crfmw.be/max


here is an external that counts the samples between impulses (signal of +1). You can use it with zerox~ to get the number of samples between zero crossings at samplerate

i don't think it helped that i didnt give my details - 

so Patrick Delges, I don't know if I can use that code.

error: error 14001 loading external ol.sampletime~

and the sampletimertest.maxpat comes out as code. I don't know what to do with that.

there is the trans_timer~.mxo folder, but I have no idea what that is :?

thanks for your replies :)
but i can't open any :( 
i don't think it helped that i didnt give my details - 
Max 4.5.5 on windows xp.

and oli larkin, 
the errors i get with your files are__

error: error 14001 loading external ol.sampletime~
and the sampletimertest.maxpat comes out as code. I don't know what to do with that.

and to Shea Ako
error: trans_timer~: No such object
there is the trans_timer~.mxo folder, but I have no idea what that is :?


i think to use that external you need to install the MS visual studio 2008 redistributable package, which can be found here:

oli, thanks,i installed the visual studio,

now the ol.sampletimer~ works as an object,

but the test patch comes out as text/code.

so basically i can't work out what/how the ol.sampletimer~ does/works :P

tried connecting a cycle~ into the top, and a signal monitor and flownumber to the bottom. but it doesnt really give me anyhting i can recognise :)

i have however got to a new point in my development.

running the wave through a zerox~, with the click going into a +=~ accumulator. 

into a buffer, the accumuluator gives the index and a running counter gives a number into the index, if i deduct previous index point value it gives me a sample value of time !! hooray !!

The problem now is to access these values in useable timing. am trying the play~ object so I can run a signal value in for index, but this creates problem with having to define a buffer~ size...

oli, thanks,i installed the visual studio,
now the ol.sampletimer~ works as an object,
but the test patch comes out as text/code.

so basically i can't work out what/how the ol.sampletimer~ does/works :P
tried connecting a cycle~ into the top, and a signal monitor and flownumber to the bottom. but it doesnt really give me anyhting i can recognise :)

i have however got to a new point in my development.
running the wave through a zerox~, with the click going into a +=~ accumulator. 
into a buffer, the accumuluator gives the index and a running counter gives a number into the index, if i deduct previous index point value it gives me a sample value of time !! hooray !!

The problem now is to access these values in useable timing. am trying the play~ object so I can run a signal value in for index, but this creates problem with having to define a buffer~ size...  

the ol.sampletimer~ works great !! am curious as to the other output ??

of course now i need to know how to get an amplitude figure between zero crossings :P

was initially hoping that i'd make the zero crossing counter object and then use techniques for that ..

https://cycling74.com/forums/index.php?t=msg&goto=155056&rid=7826&S=eb34152a19cf0b36b4d1a6e3cc7989ea#msg_155056

of course now i need to know how to get an amplitude figure between zero crossings :P
was initially hoping that i'd make the zero crossing counter object and then use techniques for that ..

have set up another topic
https://cycling74.com/forums/index.php?t=msg&goto=155056&rid=7826&S=eb34152a19cf0b36b4d1a6e3cc7989ea#msg_155056
