| 摘要 |
PURPOSE:To simplify designated logic and to maintain privacy performance by constituting a paid television receiver with a vertical pulse generating section, a pseudo random number generating section, a video field memory section and a memory line address designation logic obtaining a start line number for each field. CONSTITUTION:A trigger signal 6 is generated from a vertical pulse generating section 7, a shift clock generating section 3 receives the signal to generate a shift clock 5. A pseudo random number bit string 10 is obtained from a feedback shift register section 4 in response to the signal 5 and it is converted in parallel to obtain a parallel pseudo random number string 34. A memory line address designation logic section 11 reads a video signal written in a field memory section 13 from a line different from each field. Thus, the management and operation of the system are simplified without deteriorating privacy performance. |
