Networks using digital techniques

HELECTRICITY H03Electronic circuits H03HIMPEDANCE NETWORKS

H03H17/00Networks using digital techniques

H03H17/0009Time-delay networks H03H17/0018Realizing a fractional delay H03H17/0027by means of a non-recursive filter H03H17/0036by means of a recursive filter H03H17/0045Impedance matching networks H03H17/0054Attenuators H03H17/0063R, L, C, simulating networks H03H17/02Frequency selective networks H03H17/0201Wave digital filters H03H17/0202Two or more dimensional filters; Filters for complex signals H03H17/0211using specific transformation algorithms H03H17/0213Frequency domain filters using Fourier transforms H03H17/0216Quefrency domain filters H03H17/0217Number theoretic transforms H03H17/0219Compensation of undesirable effects H03H17/0223Computation saving measures; Accelerating measures H03H17/0225Measures concerning the multipliers H03H17/0226comprising look-up tables H03H17/0227Measures concerning the coefficients H03H17/0229reducing the number of taps H03H17/023reducing the wordlength, the possible values of coefficients H03H17/0233Measures concerning the signal representation H03H17/0235reducing the wordlength of signals H03H17/0236using codes H03H17/0238Measures concerning the arithmetic used H03H17/0239Signed digit arithmetic H03H17/0241Distributed arithmetic H03H17/0242Residue number arithmetic H03H17/0248Filters characterised by a particular frequency response or filtering method H03H17/025Notch filters H03H17/0251Comb filters H03H17/0252Elliptic filters H03H17/0254Matched filters H03H17/0255Filters based on statistics H03H17/0257KALMAN filters H03H17/0258ARMA filters H03H17/026Averaging filters H03H17/0261Non linear filters H03H17/0263Rank order filters H03H17/0264Filter sets with mutual related characteristics H03H17/0266Filter banks H03H17/0267comprising non-recursive filters H03H17/0269comprising recursive filters H03H17/027Complementary filters; Phase complementary filters H03H17/0272Quadrature mirror filters H03H17/0273Polyphase filters H03H17/0275comprising non-recursive filters H03H17/0276having two phases H03H17/0277comprising recursive filters H03H17/0279having two phases H03H17/028Polynomial filters H03H17/0282Sinc or gaussian filters H03H17/0283Filters characterised by the filter structure H03H17/0285Ladder or lattice filters H03H17/0286Combinations of filter structures H03H17/0288Recursive, non-recursive, ladder, lattice structures H03H17/0289Digital and active filter structures H03H17/0291Digital and sampled data filters H03H17/0292Time multiplexed filters; Time sharing filters H03H17/0294Variable filters; Programmable filters H03H17/04Recursive filters H03H17/0405comprising a ROM addressed by the input and output data signals H03H17/0411using DELTA modulation H03H17/0416with input-sampling frequency and output-delivery frequency which differ H03H17/0422the input and output signals being derived from two separate clocks H03H17/0427characterized by the ratio between the input-sampling and output-delivery frequencies H03H17/0433the ratio being arbitrary or irrational H03H17/0438the ratio being integer H03H17/0444where the output-delivery frequency is higher than the input sampling frequency H03H17/045where the output-delivery frequency is lower than the input sampling frequency H03H17/0455the ratio being rational H03H17/0461Quantisation; Rounding; Truncation; Overflow oscillations or limit cycles eliminating measures H03H17/06Non-recursive filters H03H17/0607comprising a ROM addressed by the input data signals H03H17/0614using Delta-modulation H03H17/0621with input-sampling frequency and output-delivery frequency which differ H03H17/0628the input and output signals being derived from two separate clocks H03H17/0635characterized by the ratio between the input-sampling and output-delivery frequencies H03H17/0642the ratio being arbitrary or irrational H03H17/065the ratio being integer H03H17/0657where the output-delivery frequency is higher than the input sampling frequency H03H17/0664where the output-delivery frequency is lower than the input sampling frequency H03H17/0671Cascaded integrator-comb [CIC] filters H03H17/0685the ratio being rational H03H17/08Networks for phase shifting