Self-inferring method of receiver for satellite broadcasting


Application Number: 00108795
Application Date: 2000.05.29
Publication Number: 1276652
Publication Date: 2000.12.13
Priority Information: 1999/6/2 JP 155216/99
International: H04B1/06
Applicant(s) Name: Matsushita Electric Industrial Co., Ltd.
Address:
Inventor(s) Name: Ninomiya Shuichi
Patent Agency Code: 31100
Patent Agent: shen zhaokun
Abstract In a normal operation mode, a receiver Rx performs predetermined processing on a digital broadcasting signal from an artificial satellite to generate sound. The receiver Rx also executes a self-diagnostic mode as required. In the self-diagnostic mode, a controller 19 runs a diagnostic check as to whether an operating keypad 17 operates correctly. Further, the controller 19 runs a diagnostic check on the level of the receive sensitivity of the receiver Rx using C/N value. Through the use of an idle time in the above two diagnostic checks, the controller 19 checks whether each generated drive voltage is within each appropriate range; whether synchronization can be established in a PLL circuit 20 required for generating an intermediate-frequency signal S<SB>IF</SB>; whether synchronization can be established in a QPSK demodulator 21 required for QPSK-demodulating the intermediate-frequency signal S<SB>IF</SB>; whether the head of a reproduced master frame Beta can be detected correctly; and whether the head of a reproduced audio data frame Alpha can be detected correctly.