A Virtual Instrument for Bio-signal Acquisition and Processing using LabVIEW

Computer based analysis of human biological signals has advanced to a great extent over these years as they provide a cost effective and efficient way of detecting these signals. Signal acquisition in PC based systems may be automated by the use of LabVIEW or Bio-Bench software from National Instruments. This however requires to be supported by Data acquisition hardware units and drivers for creating the virtual instrument environment. This paper describes an alternate simple arrangement of using the standard sound card in LabVIEW to acquire the online biosignal. Acquire sound and Filter functions along with the While loop execution control method are utilized to continuously detect and display the human Carotid pulse in LabVIEW. This creates a virtual instrument that is simple and modular and has a user friendly and convenient interface arrangement to continuously record and process