If we want to know, the duration in an exact way. For example, if we want to know the length of the, the array, we can just type x.size, and this tells me that this sound has 94,803 samples If we want to know, how many seconds that is, we can divide the, the number of samples into the sampling rate. Now we can start asking things about this sound. Here, of course, it's not showing everything, just showing the first three and the last three. Okay? So now, fs has the sampling rate 44,100 and x, is an array of integers. Okay? so, I will read this sound file into into memory. Okay, in this directory I am in, I have a file name called flutea4.wav.

Okay, so what we're going to do is have fs as a variable where to put the sampling rate, x as a variable where to put, the samples of the sound and then we're going to say read, and we're going to put filename here. So as input, we going to input the name, of the file I want to have and then as return, what it returns is the sampling rate and an array with the actual samples of the sound. And in fact, if we type help and the read function, it knows about it and tells me what is the input and the output. Okay? So now, the read function is part of our system Python. So from that part of this package, we going to import, the read function. So, what we going to do is from SciPy, and within SciPy there is a module called IO, and within that there is one specifically to handle WAV files.

And now we have to, read a sound file, okay? To read a sound file, we need to use one package, SciPy, that has this functionality. So let's start, by going to terminal and now starting the, interactive shell, that we'll be using, to program in Python, which is iPython. How to, read sound files, process sounds and then write sound files again. In this lecture I want to talk about how to use Python to process sound. In the last programming class, we introduced Python, which is a high level language quite powerful and that's going to be very useful for us for all the, applications and for all the programming, we will have to do. Welcome to the course on audio signal processing for music applications.

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