Decimation filter arrangement

Details Decimation filter arrangement Decimation filter arrangement

H - Electricity

03

H

328/0.3

H03H 17/06 (2006.01)

Patent

CA 1194140

-20- ABSTRACT: "Decimation filter arrangement". A decimation filter arrangement for reducing the sampling frequency of a time-discrete input signal from fi to fu, fu not being a rational portion of fi. For the generation of the required filter coefficients this arrangement comprises clock pulse generators producing first clock pulses ki(.) at a rate fi and second clock pulses au(.) at a rate fu. The arrangement also comprises a coefficients generator in which a deviation component dn is calculated which indicates the ratio between the time interval located between a clock pulse au(.) and the immediately preceding clock pulse ki(.), and the time interval 1/fi between two consecutive clock pulses ki(.). In response to this deviation component this coefficients generator produces N filter coefficients, the mth filter coefficient, m = 0, 1, 2, ....N-1, being equal to an(m) = h ?(dn + m) V0?. Herein the function h(v) re- presents. the impulse response of an FIR-filter, v a con- tinuous variable in the interval - ? < v< ? and V0 a predetermined constant.

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