Application in Information Technology by Digital Signal Processor

During the progress of information technology and digital signal, digital signal processor has been an important discipline. The technical application in digital signal processor has already covered almost all scientific and technological fields. Because its advantages are small size, low energy consumption, high accuracy, reliable, flexible, integrated and multidimensional-using, digital signal processor take the place of analog signal system. Conception of digital signal processor is introduced, and its feature and application are summarized, also information technology has been presented. We have made solutions in information technology of digital signal processor by using DFT(Discrete Fourier Transformation), FFT(Fast Fourier Transformation) and digital filter. Actual case have been analysed. Finally we have made the conclusion.