This paper addresses a class of generic program calculations which aim at introducing concurrency into programs by changing data-structure representations. The approach will be restricted to the fairly common situation in which the calculated program (implementation) runs at a level of abstraction lower than that of the starting program (specification). This conforms to the following quotation ...

This paper presents a common framework for subband doubletalk detectors. Within this framework a number of low-complexity subband doubletalk detectors are evaluated in comparison with a corresponding fullband detector. The evaluation is performed by using real-data offline calculations. The evaluation indicates that the subband approach significantly improves the performance.