Biological signal conditioning devices, such as Biopac amplifiers, are designed to condition a variety of biological signals (i.e. EMG, ECG, breath sounds, etc.). The bandwidth of these signal conditioning devices is usually between 0.5 Hz and 5KHz. In studies that need the simultaneous recording of both a high frequency signal (i.e. tracheal breath sounds) and a very low frequency signal (i.e. respiratory airflow signal), two different signal conditioning device must be used in order to provide the bandwidth of interest for each signal. In clinical application however, it is desirable to have one small device including hardware and software to achieve recording and analyzing of all signals of interest. One particular application is to have an integrated device for recording breath and swallowing sounds along with a respiratory airflow signal. The goal of this work was to design such a device that also had simple...

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