The Design And Implement Digital Audio Effects Processing System Based On DSP

In actual life, it can hardly reach more perfect there is audio effects in room, except there is certain with the acoustic criterion of in a recording studio or concert halls. Usually, sound will be beautified that require an audio effector. In this thesis, an digital audio effector is electronic equipment that sound effect will be more perfect with used to digital process techniques of the audio signal .This thesis introduces a variety of processing technology based on the same hardware platform. According to the requirements of the client, system schema of digital audio effector is analysed,and performance parameters of the system was proposed by us. TI's DSP platform is chosen for the system. Hardware and software are analysed and designed in the system frame. For the hardware,the thesis makes a detailed discussion, including system based on ARM processor LPC2134 as master CPU and digital signal processor TMS320VC6713 as the slave CPU, A/D and D/A converter circuits, For the software, the thesis firstly introduces the designs of algorithmic model of the common Sound-effect and special Sound-effect.To take Blues sound effect for an example, The thesis mainly focuses on the LMS algorithm of IIR adaptive filter. Then, modeling of the digital audio effect processing system is implemented in matlab language based on the theories mentioned above. In the end, the hardware platform of this system is given. After finishing the design of hardware and software, we test main performance index of system on RMAA, it completely meet the design requirements that there are the test results of frequency response, noise level, dynamic range, THD, intermodulation distortion, stereo crosstalk.With work, the sample devices are manufactured,There are realized on the digital audio effect processing system that sound effects of room,hall, canyon, space, pitch shifting, chorus, flang, blues. And. All the sound effects are certificated by professionals from our cooperative company of Guangzhou Maxsinesound Electronic Technology Company.