| 摘要 |
PURPOSE:To suppress the expansion of spectrum and to reduce effects to be given to the contiguous systems by shaping the wavforms of an input data signal and a burstlike control signal through a filter circuit. CONSTITUTION:The input data signal given from a terminal 5a and the burstlike control signal given from a terminal 5b are applied to a gate circuit 501, and a burstilike data signal 5c is obtained. Then the signal 5c is passed through a low- pass filter 502 having prescribed frequency characteristics to receive waveform shaping. The carrier wave given from an oscillating circuit 504 is modulated by a signal given from the filter 502 with waveform shaping and through a linear modulating circuit 503. Thus a burstlike modulated signal 5d which received the band limitation at an intermediate frequency band is obtained. Thus the filter 502 performs the waveform shaping of both signals 5a and 5b, and as a result, the expansion of spectrum is suppressed for the signal 5d obtained through the circuit 503. |
