Abstract: Under the overall pattern of ideological and political education, teachers of professional courses should actively explore the ideological and political construction of curriculum and excavate ideological and political elements. According to the characteristics of digital signal processing course, this paper discusses how to design ideological and political elements in terms of macro and micro perspectives. In view of the macro, the theory of digital signal processing is introduced though application examples aiming to guide students to learn professional knowledge, which can make a great contribution for our motherland, also have a sense of social responsibility and sense of mission. From the micro perspective, the ideological and political elements are mined from time-domain sampling theorem, cyclic convolution and filter design. And humanistic knowledge is properly introduced to introduce the subject preface and development trends, so as to enhance students' learning interest. Combining small teaching class with large social class, organically integrate ideological and political elements, improve teaching effect, and truly realize the goal of "three integrity" education.

Key words: Digital signal processing, Ideological and political theories of courses, Reform in education