Interpolation filter and method for digitally interpolating a digital signal
First Claim
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1. An interpolation filter for filtering a digital input signal whose amplitude response exhibits a lowpass-type attenuation curve in the useful signal frequency band Δ
- fnutz of the digital input range.
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Abstract
The invention relates to an interpolation filter and to a method for filtering a digital input signal. The interpolation filter has an amplitude characteristic with a low-pass-shaped damping curve in the useful signal frequency range of the digital input signal. The group delay time of the interpolation filter is essentially constant in the useful signal frequency range and can be adjusted within a clock period of the equidistant digital signal.
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Citations
25 Claims
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1. An interpolation filter for filtering a digital input signal whose amplitude response exhibits a lowpass-type attenuation curve in the useful signal frequency band Δ
- fnutz of the digital input range.
- View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 25)
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2. An interpolation filter for filtering a digital input signal whose amplitude response exhibits a lowpass-type attenuation curve both inside and outside the useful signal frequency band Δ
- fnutz.
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17. A method for digital interpolation of a digital input signal, having the following steps:
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(a) receiving a digital input signal with a predetermined clock frequency fin;
(b) determining filter coefficients of a settable interpolation filter whose amplitude response exhibits a lowpass-type attenuation curve in the useful signal frequency band of the digital input signal;
(c) filtering the digital input signal by means of the set interpolation filter. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification