High-Speed Recursive Digital Filters Based on the Frequency-Response Masking Approach
نویسنده
چکیده
The frequency-response masking approach for highspeed recursive infinite-impulse response (IIR) digital filters is introduced. In this approach, the overall filter consists of a periodic model filter, its power-complementary periodic filter, and two masking filters. The model filters are composed of two all-pass filters in parallel, whereas the masking filters are linear-phase finite-impulse response (FIR) filters. The transfer functions of the all-pass filters are functions of which implies that the maximal sample frequency for the overall filter is times that of the corresponding conventional IIR filter. The maximal sample frequency can be increased to an arbitrary level for arbitrary bandwidths. The overall filter can be designed by separately optimizing the model and masking filters with the aid of conventional approximation techniques. The obtained overall filter also serves as a good initial filter for further optimization. Both nonlinear-phase and approximately linear-phase filters are considered. By using the new approach, the potential problems of pole–zero cancellations, which are inherent in algorithm transformation techniques, are avoided. Further, robust filters under finite-arithmetic conditions can always be obtained by using wave-digital all-pass filters and nonrecursive FIR filters. Several design examples are included illustrating the properties of the new filters.
منابع مشابه
High-Speed Recursive Digital Filters Based on Frequency Masking Techniques
High-speed recursive digital filters are of interest for applications focusing on high-speed as well as low power consumption because excess speed can be traded for low power consumption through the use of power supply voltage scaling techniques. This paper gives an overview of high-speed recursive digital filters based on frequency masking techniques.
متن کاملDesign and efficient implementation of high-speed narrow-band recursive digital filters using single filter frequency masking techniques
ABSTRACT In this paper a novel structure for frequency masking based on a single filter is introduced. By using the proposed frequency masking approach the maximal sample frequency for narrow-band recursive digital filters is increased. This increase in sample frequency can be utilized either for faster filters or for lower power consumption by trading excess speed for low power. As the subfilt...
متن کاملA Class of High-speed Wide-band Frequency Masking Recursive Digital Filters with Approximately Linear Phase
This paper introduces a class of high-speed wide-band frequency masking recursive digital filters with approximately linear-phase. These filters feature a high maximal sample frequency, low computational complexity, and good numerical properties.
متن کاملDesign of Low Power Digital Filters
In this paper we propose an efficient approach to design high-speed digital filters with low power consumption which is based on power supply voltage scaling and exploiting the excess speed that may be obtained by using maximally fast recursive filter structures. We also discuss several techniques to increase and obtain the maximal sample rate for recursive structures based on frequency masking...
متن کاملSingle Filter Frequency Masking High - Speed Recursive Digital Filters
For recursive filter2 the maximal sample frequency is bounded by the recursive loops in the filter. In this work, a filter structure based on the use of the frequency masking approach is presented that increases the maximal sample frequency for narrowband and wideband filters by introducing more delay elements in the recursive loops. By using identical subfilters (except for the periods), the s...
متن کامل