A codesign experiment in acoustic echo cancellation: GMDFα

Communication synthesis and HW/SW integration for embedded system design

“…This application is detailed in Freund et al [1997b] which expresses also a partitioning and a scheduling of tasks. From these results, an optimized hand crafted approach and the presented method were applied to perform the communication synthesis and the HW/SW integration.…”

“…In this approach the communication synthesis problem is addressed as a characterization and an optimization of communications involved in the application. Compared to Freund et al [1997b] the extended synthesis method detailed in this paper is based on a refined communication model achieving accurate synthesis results. Communication synthesis and HW/SW integration take place after the partitioning and scheduling phase allowing the use of various partitioning heuristics.…”

“…They consider respectively a global and a fine behavioral model of the system. The global one introduced in Freund et al [1997b] is based on a usual communication and execution model [Lee and Messerschmitt 1987]. As shown in Figure 2(b) this model merges in a single time frame the computation (i.e., T exe i ) and communication times (i.e., send times t e i,j and/or receive times t r i,j ) associated with a node of the graph.…”

“…This point is detailed in the sequel. Since the global evaluation approach has been published in Freund et al [1997b], we focus mainly on the fine evaluation method.…”

Interface Synthesis in Embedded HW/SW Systems

“…To illustrate the principles of this generic architecture we consider a frequency domain block adaptative algorithm for acoustic echo cancellation (GMDFa) (Freund, 1996). Before synthesis of communications all units are connected through FIFOs placed in a network of six bus.…”