A Signal Analysis System Based On LabVIEW

Virtual instrument technology is a new technology,and it is an important direction in modern instrumentation development.Virtual instruments are often used in modeling and simulation,design and planning,education and training.The acquisition equipment from NI has a good performance,but constructing signals analysis system will cause high cost. Sound card with data transmission and A/D converter functions as a DAQ card has low-price,easy-developing and flexible-system such virtues.Based on the above analysis,taking the computer sound card instead of DAQ card as hardware,designs the system based on LabVIEW,and implements it in the signal analysis experiments.The main contents are listed as follows:1)An envisage for using sound card as a virtual audio data acquisition equipment to construct the signals analysis system and implements it in the experiments is put forward.The neeessity and feasibility by the sound card system to set up signals analysis system based on research of teaching program of experiments in the number of traditional college is analyzed.2)Audio signal acquisition and analyze system is constructed based on LabVIEW,it has functions of virtual signal acquisition,analysis,waveform display,storage and transfer of data files to meet the needs of the experimental teaching.3)A lot of experiments of the method presentend in this paper have done,the results of the experiment have proved that the design of the system is reasonable and feasible.It is simple to apply with good interface and easy to use.Function appending is available on user requirement.It offers a kind of DAQ solution with low cost.With broad application prospect,this solution can be extended to the field of speech recognition,ambient noise monitoring and laboratory measurement etc.