The most recent generation of RISC-based workstations has made it possible to perform powerful signal-processing functions in real time. These functions can be implemented in a high-level language, such as C, while retaining sufficient performance for real time. A useful example that exploits these powerful capabilities has been written for the Silicon Graphics Indigo family of workstations. The specific application implements a real-time signal analysis/synthesis tool based on the overlap add short-time Fourier transform. It generates high-resolution 3-D images of the power spectrum of the audio input in real time. This application utilizes the 100-MHz RISC to compute forward and inverse fast Fourier transforms (FFTs), along with the 3-D surface polygons, while keeping up with real time. There is an intuitive user interface which allows users to examine various spectral features in great detail. In addition, it is possible to draw trajectories for filter center frequencies on top of the spectrogram and listen immediately to the resulting time-varying filters. A demonstration of this application will be shown.
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can
subscribe to this RSS feed.
Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.
