An Application of the Dataflow Processors for Real-Time Signal Processings
Kazunobu Kashiwabuchi, Nobuharu AOSHIMA · Transactions of the Society of Instrument and Control Engineers · 1989
A dataflow processor is applied for real time signal processings. Advantages of using the dataflow processor for interrupt processings are (1) Store and load operations of registers are not necessary because there is no register in dataflow processor. (2) Main processings are not stopped because parallel processings are possible. (3) All interrupts can be treated equally. (4) Interrupt signal itself (token) can hold data, so data input time is saved. (5) Interrupt processing programs can be written easily because they are essentially same as ordinary processings.A signal processing system by ImPP (Image Pipelined Processor, dataflow processor from NEC Corp.) is designed and constructed. This system is named “dasp” and installed four ImPPs, MAGIC, A/D, D/A and memories. Special pseudo-DMA data transfer is adopted for analog input and output.Real time signal processing ability of “dasp” is examined. The μ-law compander and PARCOR vocoder are implemented on “dasp” and evaluated. The results showed that the “dasp” had enough capability or real time signal processings and was comparable or even better than typical DSP systems.