| 摘要 |
PURPOSE:To improve the quality of reception in receiving character broadcast, by detecting the state of group delay characteristics and switching the characteristics of a surface acoustic wave filter in response to the detection for the correction. CONSTITUTION:An error detection pulse (a) is outputted from a Fleming code comparator 41. This detected pulse (a) is given to a relay drive circuit 44 via a logical circuit 42. The relay drive circuit 44 drives a relay 46 to make the relay 46 on. A cross direction type transducer is interrupted. Inversely, when a detected pulse (b) is outputted, the pulse (b) is given to a relay drive circuit 43 via the logical circuit 42. A relay drive circuit 43 makes on the contact of a relay 45 to interrupt another cross direction type transducer. |
