This paper describes the design of a digital filterbank, that runs in real-time on a single TMS 320 processor. The designed filterbank uses Finite Impulse Response (FIR) filters, which enables exact time alignment for all frequencies. Furthermore, the output channels of the filterbank have a high frequency selectivity. This high selectivity has certain advantages, but also potential disadvantages, for instance with respect to low harmonics positioned inside or outside a specific filter. To ensure robustness of the filterbank to changes in f0, an algorithm is presented that eliminates most of these effects. Results for vowel identification are presented.
Bibliographic reference. Alphen, Paul van / Pols, Louis C. W. (1989): "A real-time FIR-based felterbank, as the acoustic front end of a speech recognizer", In EUROSPEECH-1989, 1621-1624.