626型快速傅里叶变换处理机方案介绍

快速傅里叶变换(FFT)处理机是最近十年内发展起来的.我们曾为天津电子仪器厂和国家海洋局五所的FAI型实时信号分析仪进行了方案设计,已于1979年研制成功.该机适宜于处理音频信号,1024点的FFT处理时间为40ms.为了满足更高频信号的要求,我们正和上海573厂共同研制速度更快的626型处理机,1024点的FFT处理时间约为5ms,现正进行总调.由于国内已有不少单位介绍过这类处理机的设计[1],因此本文仅就626机如何提高处理速度的问题作重点介绍.

An Introduction to the Project of 626-Type FFT Processors

FFT processors have been developed within the recent ten years. The NationalOcean Bureau and Tianjin Electronic Instruments Factory succeeded in developinga real-time signal analyzer FA-1 type in 1979, based on our schematic design. Thatmachine is used for processing acoustic signals. Its computing time of 1024-pointFFT frequency spectrum is about 40ms. Now, we are developing a 626-type FFTprocessor to satisfy the requirement of higher frequency signals. Its computing timeof 1024-point FFT frequency spectrum is about 5ms. As there have already beenpapers introducing projects of FFT processors, our paper will only show essentially howthe high speed is achieved.