Development of CAI Tools for digital signal processing education using an object-oriented programming language

如何将用户友好界面与通用多处理器系统相结合来开发并行应用软件是一个重要的问题。为此，选择了一款数字信号处理教学CAI工具作为应用软件，该软件既要求界面友好，又要求计算能力强。利用一个工作站环境，实现Smalltalk并与Transputer系统接口，来开发这样的应用软件。然而，在研究工作的中途，我们考虑到Transputer产品的发展，将系统模型从网络环境下的局部应用扩展到分布式计算环境下的应用。已经开发了一个原型系统，使用典型信号处理过程的计算和Mandelbrot集作为这种类型的应用来评估扩展的系统模型。从评估中发现，当前以太网的通信速率可能成为此类应用总体性能的瓶颈。有关的研究工作正在从几个方面继续完善现行的制度模式。

It is important how to integrate user-friendly interface and general purpose multi-processor systems to develop parallel application software. For the purpose, a CAI tool for teaching digital signal processing is selected as an application software which requires both user-friendly interface and computing power. A workstation environment, which is implementing Smalltalk and interfacing Transputer systems, is utilized to develop such application software. However, in the middle way of research work, we extended the system model from the local application in a network environment to the one in a distributed computing environment considering the progress of Transputer products. A prototype system has developed to assess the extended system model using the caluculation of typical signal processing procedures and Mandelbrot sets as an application of this type. From the assessment, it is found that the communication rate of the current Ethernet can be a bottle neck of the total performance of such applications. Concerned research work is continuing to improve the current system model considering several aspects.