Study And Implementation Of Digital Audio Algorithm

With the development of technology, digital signal processor DSP is widely used in various electronic products. From portable personal digital assistant to home theater, electronic products has generated a huge impact to people's lives. People not only have a high requirement on the quality of visual but also the quality of sound. Their demand for audio has been gradually upgraded from a simple sound to hearing enjoyment. The audio effect devices have been concerned widely.This article mainly studied on the following aspects of the sound processor, that is, a dynamic gain control of digital mixer system, including compressor, expander, noise gate, etc.; digital audio processing systems, including digital audio reverb, parametric equalizer, a special sound device. Main tasks are as follows:(1) Study on the parametric equalizer algorithms, comparing parametric equalizer performance advantages and disadvantages of several design methods, and proposing a improved computer-aided method.(2) Study on the reverb algorithm to achieve two classic of the reverberation models, Schroeder model and Moorer model, and optimize the algorithm for real-time processing.(3) Study on some typical principles of special effects, including chorus, flange effects, echo effects, vibration sound, tremolo effect, stereo-move effects, and designed a special audio device for real-time processing.(4) Achieve a dynamic gain controller, with adjustable parameters in real-time.