How to Find if a Single-Board Computer Loses Audio Samples in an Isochronous Data Transfer via USB

摘要

This work deals with the issue of loss of samples in a data acquisition process using an audio capturer device connected to a low cost and consumption single-board computer via USB interface. A question that may arise in this kind of hardware is if it can acquire data from the device avoiding an overrunning buffer. A method for finding lost samples is presented that is based on the acquisition of a linear frequency modulation signal and the analisys of its discrete Fourier Transform. An example illustrates the effectiveness of the proposed method.