| 摘要 |
PURPOSE:To control optionally variably the phase frequency characteristics in the range of + or -90 deg. over the entire band by constituting the titled digital phase shifter with the 1st - the 3rd operating means, a real part filter, an imaginary part filter and a Hilbert converter. CONSTITUTION:The digital phase shifter consists of an operating processor 4 calculating a real part response and an imaginary part response of a frequency response based on prescribed phase information, operating processing devices 5, 6 calculating the time series impulse response of the calculated real part response and imaginary part response, a real part section taking the respective calculated time series impulse reponse as a filter coefficient, imaginary part real time processing linear phase transversal filters (real part filter, imaginary part filter) 9, 10 and the Hilbert converter 7 connected in cascade with the filter 10. Thus, the desired phase frequency characteristic is obtained within the range of + or -90 deg. over the entire band in this way. |
