Recording Data into buffer~ with peek
Hello there,
I am trying to record around 12 hours of non audio data into a buffer sampling every 50 ms so I can playback (time lapse data) later. I am finding that buffer is only recording around half an hour and then no more.
I have set the buffer size to 1000,000 and the sample rate to sr20 so twenty times a second (1000 / 50 = 20)
I figure 1,000,000 divided by 3600 (amount of seconds in an hour) / 20 (amount of 50 ms in a second) = 13.8 hours. So anyway I'm obviously going wrong somewhere , not sure if niquist needs to be considered I paste the patch below any help appreciated:
You appear to be confused about the arithmetic involved, as well as by the units used in the argument to buffer~.
Here's a way to think about it.
How many numbers do you need to store?
(12 hrs) * (60 min/hr) * (60 sec/min) * (20 samples/sec) = 864,000 samples
How many seconds' worth of storage do you need?
Assuming that the audio sampling rate you're using is 44.1KHz...
(864,000 samples) / (44,100 samples/sec) = 19.5918367 sec
You specify the size of a buffer in terms of the number of milliseconds' worth of samples it will hold. So...
(19.5918367 sec) * (1000 ms/sec) = 19,591.8367 ms
Therefore an object called [buffer~ mydata 20000] will be ample.
(Alternatively, you can create [buffer~ mydata], then send it a message 'sizeinsamps 864000'.)
Great Christopher thanks , Ill give this a go later