Fecha de publicación: 11/10/1988 Fuente: Wipo "digitalization" A digital signal processing apparatus with a rate-conversion function has at least two digital filters and a memory. A digital signal stored in the memory is selectively transferred to the at least two digital filters. These digital filters perform a filtering operation in parallel, and the results from each of the digital filters are alternately derived by a multiplexer. Thus, high-speed filtering can be executed. The memory temporarily stores a time-division-multiplexed signal which is sequentially read out of the memory and selectively transferred to the digital filters. Thus, a plurality of digital signals can be filtered by the same digital filters without an increase in hardware elements. Therefore, the digital filter section can be integrated in a single semiconductor chip. A shift register may be used as the memory, whereby a circuit arrangement of the digital filter section can be extremely simplified.