Patent ID: 11894942
Assignee: NANNING FULIAN FUGUI PRECISION INDUSTRIAL CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. The communication system based on DOCSIS protocol according to claim 6, wherein:
the second modulation and demodulation unit is further configured to send out calibration signals with a first bandwidth range, a second bandwidth range and a third bandwidth range;
when the second modulation and demodulation unit sends out the calibration signal with the first bandwidth range, the calibration signal reaches the first modulation and demodulation unit through the upstream sub communication path and the tertiary filter path, and the system-on-a-chip adjusts the fourth power amplifier and the third phase regulator to cause a power of the calibration signal with the first bandwidth range obtained by the first modulation and demodulation unit to become 0 Decimal Bel Millivolt (dbmv);
when the second modulation and demodulation unit sends out the calibration signal with the second bandwidth range, the calibration signal reaches the first modulation and demodulation unit through the upstream sub communication path and the secondary filter path, and the system-on-a-chip adjusts the third power amplifier and the second phase regulator to cause the power obtained by the calibration signal of the second bandwidth range in the first modulation and demodulation unit to become 0 dbmv;
when the second modulation and demodulation unit sends out the calibration signal with the third bandwidth range, the calibration signal reaches the first modulation and demodulation unit through the upstream sub communication path and the primary filter path, and the system-on-a-chip adjusts the second power amplifier and the first phase regulator to cause the power obtained by the calibration signal of the third bandwidth range in the first modulation and demodulation unit to become 0 dbmv.