| 摘要 |
<p>PURPOSE:To improve the ECM performance by modulating a carrier signal by a converted two-phase modulating signal, and executing effectively a spec trum diffusion to designated pulse width, etc. CONSTITUTION:Data of pulse width, subpulse width and code length from a signal processing circuit are sent to a selector 13, and outputted to a shift register 8 from an optimal selector 13 in accordance with those input data. In this case, an AND gate 4 multiplies a two-phase modulation code signal and a pulse modulating signal, and mixers 5, 7 mix a carrier signal and the pulse modulating signal. Also, driver circuits 3, 6 drive the two-phase modulation code signal chopped by the pulse modulating signal by the gate 4. In such a way, the selector 13 is set so that an initial value corresponding to each combination of designated pulse width, subpulse width and code length can be outputted. As a result, the signal driven by the circuit 6 is inputted to the mixer 7, the carrier signal is subjected to two-phase conversion and the ECM performance is improved.</p> |
