heterodyne filter การใช้

• Digital adaptive heterodyne filter adopts the heterodyne - modulation conception , which makes the filter work in low frequency and lessens the complexity of design
• According to the characteristic of digital adaptive heterodyne filter and the conception of interference counteraction , the paper presents a new structure to enable the filter track the interference signal precisely and control the width and depth of notch . through simulation , it is demonstrated that the new structure can suppress one or more interference signals and the filtering operation has little influence on signal spectrum