SndBuff and Arrays

MeCH · Joined: Apr 01, 2010 Posts: 6 Location: Austria

Hi, i am new here, and have some questions about chuck. I'm not very good in dealing with chuck, so i ask for your understanding.

My question now: I have to read in sound from a file (with sndbuff) and form a microphone (with adc) into a buffer (max 1.5 sec length). The play and record of the buffer should be solved by an array.
So how can i sample sound into an array with max 1.5 sec length and how can i play that array? How can i store sound from a file or a microphone in that array.

Hope someone can help me.

MeCH

Antimon · Posted: Thu Apr 01, 2010 3:13 am Post subject:

MeCH!

In ChucK, arrays (as we normally use the term) are used to store lists of numbers or other things. It isn't practical to use these for audio though, for what you want you should use LiSa (http://chuck.cs.princeton.edu/doc/program/ugen_full.html#LiSa). Check out the tutorial and example links - they'll give you a good start on using this neat UGen.

/Stefan

MeCH · Joined: Apr 01, 2010 Posts: 6 Location: Austria

Hi, thanks for the quick answer. I wanted to use LiSa, but i am not allowed to use it. It's an exercise where we must do that with arrays Sad

.

Perhaps you can help me solving this with arrays Very Happy

gz,
MeCH

Antimon · Posted: Thu Apr 01, 2010 5:34 am Post subject:

Aha! But if it's an exercise you should solve it by yourself, shouldn't you? Wink

Ok, I'll give you a hint. You can make an array of floats, wait one sample at a time, and use the next() member function in a certain UGen that I'm not going to tell you what it's called... Twisted Evil

/Stefan

MeCH · Joined: Apr 01, 2010 Posts: 6 Location: Austria

Yes, it's an exercise Laughing

But how can i set the array, that it is exectly 1.5 sec?
And i think i must use the pulse generator to get each sample?

gz,
MeCH

Antimon · Posted: Thu Apr 01, 2010 6:20 am Post subject:

OK, I'll help you a little bit more Wink

This will give you the exact amount of samples needed for 1.5 seconds:

1.5::second / 1::samp

If you do a loop, and inside wait 1::samp, get the last value from the adc, wait 1::samp, get the last value from the adc and so on, you'll get the correct incoming sample values from the input. To play back, you do the same thing the other way round.

/Stefan

Kassen · Posted: Fri Apr 02, 2010 6:37 am Post subject:

muetzenflo · Joined: Apr 03, 2010 Posts: 2 Location: austria

hey there! I'm also doing this exercise Smile

Thanks for your help so far, it really got me forward. But now I'm stuck at "getting the last value of adc". I wanna save this last value in my float-Array, but i don't find out how to get a float value out of my adc-signal...

My chain until now is:
adc => gain => impulse => blackhole;

and i wish it would be possible to do something like this within my loop:
impulse.next $ float => myArray[currentSample];

can you help me/us out one more time?? Embarassed

thx!

muetzenflo · Joined: Apr 03, 2010 Posts: 2 Location: austria

i think i just found the solution.

Gain g.last() should do the trick Smile

Kassen · Posted: Sat Apr 03, 2010 10:48 am Post subject:

MeCH · Joined: Apr 01, 2010 Posts: 6 Location: Austria

Hi, thanks for the help Very Happy

Next question:
I declare an array with:

Antimon · Posted: Fri Apr 09, 2010 3:47 am Post subject:

Hmm, I'm not completely sure about this, but perhaps you need to connect the adc to something to have it generate values. Try:

MeCH · Joined: Apr 01, 2010 Posts: 6 Location: Austria

I think input form microphone works now.

Is it possible that i must write 1::samp => now; to wait one sample, and not only 1::samp; ?

The next question i have is, how can i replay that array now. It should be the other way, like:

Kassen · Posted: Sat Apr 10, 2010 4:54 am Post subject:

MeCH · Joined: Apr 01, 2010 Posts: 6 Location: Austria

Works all now, thanks a lot for the explanations and tipps. Very Happy