Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1998-07-02
2000-10-24
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
341 61, 708313, H03K 500
Patent
active
061373494
ABSTRACT:
A filter combination for sampling rate conversion is disclosed comprising a series combination of: an input low-pass filter (1) whose attenuation characteristic (tp1) has at least one first attenuation value (a1) in the vicinity of one-half and 1.5 times the frequency of a digitization clock (f1); a time-invariant interpolation filter (2) for increasing the number of samples from that of the first data sequence (d1) by an integral factor whose attenuation characteristic (tp2) has at least one second attenuation value (a2) in the vicinity of the frequency of the digitization clock (f1) and essentially at least one third attenuation value (a3) in the region between one-half and 1.5 times the frequency of the digitization clock; and a time-varying interpolation filter (3) for interpolating a data sequence (d5) provided at the output of the time-invariant interpolation filter (2), the attenuation characteristic (tp3) of the time-varying interpolation filter (3) having at least one fourth attenuation value (a4) in the vicinity of twice the frequency of the digitization clock (f1).
REFERENCES:
patent: 4748578 (1988-05-01), Lagadec et al.
patent: 5712635 (1998-01-01), Wilson et al.
Schussler, et al., "On Partly Digital Anti-Aliasing Filters", AFU, Band 36, pp. 349-355, 1982.
Ramstad, "Digital Methods for Conversion Between Arbitrary Sampling Frequencies", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-32, No. 3, pp. 577-591, Jun. 1984.
Chu, et al., "Multirate Filter Designs Using Comb Filters", IEEE Transactions on Circuits and Systems, vol. CAS-31, No. 11, pp. 913-924, Nov. 1984.
Copy of European Search Report for EP 97 11 0914, dated Feb. 12, 1998.
Alrutz Herbert
Menkhoff Andreas
Le Dinh T.
Micronas Intermetall GmbH
Plevy Arthur L.
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