A digital variable-frequency system and its signal processing method
A digital down-conversion and signal processing technology, applied in transmission systems, electrical components, modulation transfer, etc., can solve the problems of fixed inverter structure, poor system flexibility, difficult programmable logic devices, etc., to simplify the extraction filter processing , Improve resource utilization, facilitate design and implementation
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[0038] A digital down-converter as shown in Figure 1, said digital down-converter includes an input end for receiving an input signal, a mixer circuit coupled to said input end for down-converting said input signal, and a coupling to the decimation circuit of the mixer. The decimation circuit includes a fixed decimator and a variable decimator, and the decimation circuit is used to decimate the down-converted signal by a factor selected based on the characteristics of the input signal. The digital downconverter also includes a signal conditioning circuit coupled to an output of the decimation circuit, an interpolator coupled to the decimation circuit, a second mixer circuit coupled to the interpolator, the signal A conditioning circuit conditions the decimated signal, the interpolator increases the number of samples within the conditioned signal, and the second mixer circuit operates to modulate a carrier with the conditioned signal.
[0039] As shown in Figure 2, a digital d...
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