I want to know how data acquisition toolbox works after 'start(ai)'

Usually, we write a simple data acquisition program like this:

ai=analoginput('windsound');
addchannel(ai,1);
set(ai,'SampleRate',8000);
set(ai,'SamplesPerTrigger',20000);
set(ai,'TriggerType',Inf);

start(ai)

data=getdata(ai,20000);

delete(ai)
clear ai

I am not clear what will happen after execution of start(ai);

Make a guess, after execution of start(ai), the program starts to acquire sound signal and save into the hard drive. 'data=getdata(ai,20000)' will withdraw data from hard drive file to 'data'.

So if I do not execute 'delete(ai)' and 'clear ai' right away, this program will still acquire signal into the hard drive. My guess is correct? Which file should be the saved data after execution of start.

Thank you

Answer 1

[Walter Roberson]

The data will not be saved to the hard drive: it will be saved into memory.

[xiaobo wu]

Ok,after start(ai), the data will be save into memory, will the data keep saving into memory until stop(ai)?

[xiaobo wu]

I resolved this question. Thank you.