Need to create audio signal for perceptual task

Hi there everyone, Im working with a perceptual task. Imagine we have a dot that is projected on your screen. On different trials, this dot moves around and adopts different trajectories within the screen, with a fixed trial duration of, say, 2.5 s. I have all this information a priori, which means that I know the exact trajectories of the dots, during all trials. What I need then is to be able to create an audio file, which I can reproduce during each trial and which encodes information about the position of the dot. Since the dot moves in a 2D space, I would need to be able to provide a 2 column vector to this tool, in order to transform that information into an audio file. The idea being that the audio file lasts exactly the same as the corresponding trial, and encodes what is happening in the screen in real time.

ANY SUGGESTIONS??????

thanks in advance :)

[Star Strider]

‘... encodes information about the position of the dot.’

What information do you want in the audio file?

A two-column file would be a normal stereo MATLAB audio file, so the first column would be the left side and the second column would be the right side. Within limits, the intensities and frequencies can vary individually, however it could be difficult to make this adaptive, so the dot motion and the sound file would have to be structured together and programmed to match each other before either was presented to the subject.

[Mario Trevino]

the idea is that the function that generates audio files reads two column matrix with information about the dot, it could be for example pos_x, pos_y, or speed_x, speed_y, or a polar transformation of pos_x, pos_y. The thing here is transforming those input signals into audible components. I do know the trajectories in advance, so its perfectly viable to create the audio signals before running the trials. The problem I anticipate now is that the reproduction of audio signal should involve an envelope that starts before the actual information occurs on screen, otherwise we would be reproducing sounds that contain info after the fact.....

[Star Strider]

You will need to use the audiowrite, audioread and audioplayer functions for this project. The sound function may also be an option.