| 摘要 |
PURPOSE:To prevent deterioration in line quality by minimizing an orthogonal error with respect to the sub-synchronization detection demodulation section user for a digital radio equipment. CONSTITUTION:In the sub-synchronization detection demodulation section having an orthogonal detection section 1, a phase rotating section 3, a transversal equalization section 4, and a control signal generating section 5, a control signal from the control signal generating section is used to apply phase inverse rotation calculation to Ich, Qch error signals from the transversal equalization section to extract Ich, Qch inverse rotation error signals. Furthermore, the sub- synchronization detection demodulation section is provided with a control section 6 in which the signals are exclusively ORed respectively with Ich, Qch digital signals and a variable capacitance control signal is generated and with a varactor element 7 controlling the phase of any of Ich, Qch carrier signals obtained through branching at a 90 deg. hybrid in response to the variable capacitance control signal. |
