| 摘要 |
<p>the video signal (1) which is to be modulated and transmitted is fed in parallel to the inputs of two inter-raster anti-foldback filters (5,9). The output of one filter (5) is fed to a first modulator (5). The output of the other filter (9) is fed directly (31), and via a movement detector (35), to a mixer (27). The output (17) of the first modulator (15) is also fed via a low pass filter (21) to the mixer (27). The mixer output (41) is fed to the second modulator (45). The second modulator output (47) is fed to a satellite transmitter (49). Similar circuits are used at the receiver. @(10pp Dwg.No.1/2)@.</p> |
