专利名称：NOTCH FILTER发明人：THOMAS V. SALIGA申请号：US3659212D申请日：19700616公开号：US3659212A公开日：19720425
摘要：A band of frequencies in a signal is suppressed by forming a passband andcanceling with it a portion of the signal. The passband is formed by first passing the signalthrough two mixers that beat quadrature components of the signal down to baseband,then passing each of these low frequencies signals through separate low pass filters,beating the filtered signals to center frequency, and adding them together. Steepsidebands are obtained by making the low pass filters active and by a feed back thatforces the phase errors to zero within the low frequency passband.
申请人：HONEYWELL INC.
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