| 摘要 |
PURPOSE:To attain sufficient correction even in real time by using a data of a gray scale signal level detected when an artifitial satellite passes the zenith so as to update a data of the gray scale signal level at the preceding reception. CONSTITUTION:When the artifitial satellite starts coming to the visual field of an earth station and a radio wave is caught by an antenna 1, an input signal (b) is generated and after the signal is received and processed by a receiver 2, the result is demodulated by an AM demodulator 3, from which a base band signal (a) is obtained. The signal (a) is inputted to an A/D converter 4 and also to a synchronous detector 5, where the line synchronization is executed by using a line synchronizing signal detected by the line synchronizing signal. When the line synchronizing signal is detected, a CPU6 fetches a picture data outputted from the converter 4 based on the line synchronizing signal. Then the picture data is corrected by using a gray scale data stored in a gray scale data storage memory area 7, and the corrected picture data is stored in a picture data storage memory area 8. |
