H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/47, 328/0.3
H03H 17/06 (2006.01)
Patent
CA 1241381
-20- ABSTRACT : "Interpolating filter arrangement with irrational ratio between the input and the output sampling frequencies". Interpolating time-discrete filter arrangement for increasing the sampling frequency of a time-discrete signal from fi to fu, fu not being a rational multiple of fi. For the generation of the required filter coeffi- cients this filter arrangement comprises clock pulse gene- rators which produce input clock pulses ki(q) at a rate fi and output clock pulses ku(n) at a rate fu. It also comprises a coefficients generator in which a deviation component d(q) is calculated which indicates the relation- ship between the time interval Td(q) located between an input clock pulse ki(q) and the immediately preceding or the immediately subsequent output clock pulse ku(n) and the time interval Tu=1/fu between two consecutive output clock pulses ku(n). In response to this deviation compo- nent the filter coefficients generator produces W filter coefficients, the wth filter coefficient (w = 0, 1, 2, 3, ... W-1) being equal to a(d(q),w) and being defined by the expression a(d(q),w) = h(d(q)Tu + wTu) Herein the function h(v) represents the impulse response of a FIR filter and v a continuous variable in the inter- val - ? < v < ? .
471446
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
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