Design of a high-speed spectral signal processing system with a floating-point DSP for FTIR spectrometer

A novel Spectral Signal Processing System (SSPS), which uses a high-speed floating-point digital signal processor (DSP) as its central processor, is presented in this paper. This system is used in Fourier transform infrared (FTIR) spectrometer. The basic working principle of SSPS is briefly introduced. The design solutions and the architecture of hardware platform, including signal processing block, data transmission block, and memory part, are described in the paper. The principle and implementation of each crucial device chosen for SSPS, such as DSP, dual-port RAM, Complex Programmable Logic Device (CPLD), etc, are described in detail. For software design, three steps of signal processing methods are proposed based on the characteristic of FTIR spectrometer. Then, the paper describes how to program the software in C language and assembly language, and compile it to the code that can be used by DSP. In the last part, an application of the SSPS module used in a FTIR spectrometer is shown.