| 摘要 |
The invention is intended to integrate the means for scrambling (ciphering) the television signal and the means for descrambling the scrambled signal to reproduce the original signal, possessing a memory for storing the key data, in which. when scrambling is instructed by the operation switch, the output of the memory is given to the read address counter through the address generating circuit from the MSB inverting circuit, and scrambling is effected by executing line rotation from the cut point differing in every 1H. When descrambling, reverse processing is effected to decipher. Since circuit blocks for scrambling and descrambling are common, by integrating them, the apparatus is reduced in size, and presented at a lower price. |
