Title :
Design of discrete coefficient frequency-response-masking FIR digital filters
Author :
Wang, Chengyou ; Kwan, Hon Keung
Author_Institution :
Sch. of Electron. Sci. & Eng., Nat. Univ. of Defense Technol., Changsha
fDate :
Nov. 30 2008-Dec. 3 2008
Abstract :
In this paper, two methods to design frequency-response-masking (FRM) FIR digital filters with discrete coefficients obtained from optimal continuous coefficients are investigated. First, a one-by-one (OBO) quantization from optimal continuous coefficients is described. Then, a novel recursion design (RD) is presented, which reduces computation by searching only possible quantization sequence in next recursion from the minimum magnitude response error in last recursion. To decrease current magnitude response error, the normal quantization is modified by adding an integer multiple of the quantization step value. For a further reduction, a re-optimization is inserted into the recursion procedure. A design example shows that RD can obtain the discrete coefficients with smaller maximum passband magnitude ripple than those using direct quantization (DQ) and OBO; whereas its maximum stopband magnitude ripple is almost identical to that of OBO.
Keywords :
FIR filters; frequency response; FIR digital filters; discrete coefficient; frequency response masking; minimum magnitude response error; one-by-one quantization; optimal continuous coefficients; recursion design; Design engineering; Design methodology; Design optimization; Digital filters; Finite impulse response filter; Frequency response; Frequency synthesizers; Linear programming; Passband; Quantization;
Conference_Titel :
Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on
Conference_Location :
Macao
Print_ISBN :
978-1-4244-2341-5
Electronic_ISBN :
978-1-4244-2342-2
DOI :
10.1109/APCCAS.2008.4746060