| 摘要 |
PURPOSE: To eliminate normal state carrier frequency components by sampling the amplitude of information signals at a speed equivalent to a frequency which is the double of the frequency of carrier frequency signal components, adding it to a preceding sample and dividing the respective ones by '2'. CONSTITUTION: A series of control signal samplings are established by sampling feedback control signals by the double of the frequency of carrier wave signals, the respective samplings are added with the preceding sampling by an addition network 54 and a corresponding series of sampling added values are formed. Then the respective sampling added values are divided by '2' by a division network 58 and a corresponding series of feedback control signal samplings from which the carrier wave frequency is filtered usable for oprating a controller 48 are formed. Thus the normal state carrier frequency components are eliminated. |
