| 摘要 |
A transmitter apparatus capable of reducing the distortions of vector modulated waves. This apparatus includes variable coefficient filters (110,112) in a stage preceding an amplitude signal voltage generating part (104) and also includes variable coefficient filters (111,113) in a stage preceding a phase modulated wave generating part (105). These variable coefficient filters (110-113) are used to perform a pulse shaping, thereby adjusting the delay between an amplitude component modulated signal (r(t)) and a phase component modulated signal (SC(t)) whereby a resolution, which is finer than the sampling period of a signal processing, can be used to adjust the delay time difference between the amplitude component modulated signal (r(t)) and the phase component modulated signal (SC(t)). As a result, the distortions of vector modulated waves (Srf(t)) can be reduced to a sufficiently small level.
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