| 摘要 |
<p>A quadrature modulation circuit includes a low pass filter (20) which operates by a time division process for the in-phase channel (I) and the quadrature-phase channel (Q), and reduces address requirements data using the amplitude symmetry of the wave form and/or using the symmetry wave form on the time axis. The capacity of the ROM (201) is reduced by one half or more and the configuration of the quadrature modulation circuit is simplified. <IMAGE></p> |
