| 摘要 |
<p>Device for the protection of a video tape on the "sound" track of which have been recorded coded messages, comprising a detector (9) for detecting said coded messages, means (7, 8) for inhibiting or enabling the reading or copying of the tape at each detection of a coded message corresponding to a preset program and means (analog delay lines) (3, 5) for transmitting the sound signal while eliminating the coded message. </p> |
