Sine and cosine waveforms at the filter center frequency have the same sample length as the input signal vector. The input signal, x(n), is processed as a vector of samples (eg from a '.wav' file), which are complex down-converted to baseband by two multipliers. This document gives the formula for the bandpass filter of Figure 1 as follows : See Appendix A for a more detailed view of signal data within the filter.Ī look at the filter block diagram above (Figure 1), which is takenįrom a filter design document by Momentum Data Systems. ![]() The filter has complex down-conversion to baseband followed by filtering then up-conversion. This article is available in PDF format for easy printingįig 1.
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