초록 ▼

A second random number generator (102) sets a scramble key data included in a transmitted/received data to an initial value, and it generates predetermined second random numbers. A first random number generator (101) generates first random numbers from the second random numbers supplied by the secon

A second random number generator (102) sets a scramble key data included in a transmitted/received data to an initial value, and it generates predetermined second random numbers. A first random number generator (101) generates first random numbers from the second random numbers supplied by the second random number generator (102). The generation of the first random numbers by the first random number generator (101) is controlled by an output from a first control circuit (103). Since the output from the first control circuit (103) is changed in accordance with a service identification code SI, the first random numbers generated from the first random number generator (101) are changed. The first random numbers are input to a gate circuit (105) via a second control circuit (104). The second control circuit (104) inhibits the output of the first random numbers in accordance with the SI value. In such a manner, scrambling or descrambling is controlled in the gate circuit (105).

대표청구항 ▼

[ What is claimed is:] [1.] A data processor for scrambling or descrambling communication data transmitted in an FM multiplex broadcast, comprisinga random number generating circuit for determining an initial value in accordance with scramble key data included in the communication data and for gener

[ What is claimed is:] [1.] A data processor for scrambling or descrambling communication data transmitted in an FM multiplex broadcast, comprisinga random number generating circuit for determining an initial value in accordance with scramble key data included in the communication data and for generating random numbers,a logic circuit for executing a logic operation on the generated random numbers and the communication data, anda control circuit for controlling whether or not a logic operation of the random numbers and the communication data is executed in the logic circuit in accordance with a scramble identification code included in a service identification code indicating the service contents of the FM multiplex broadcast.