| 摘要 |
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 coefficients this filter arrangement comprises clock pulse generators 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 relationship 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 component 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 interval - INFINITY <v< INFINITY . |
