Patent ID: 6754347
Filing Date: 2004-06-22
Classification: H04N

Abstract:
An input/output unit for managing data that is input and output between a receiving unit and an external unit, the receiving unit having receiving means for receiving digital data that has been at least partly scrambled and descramble means for descrambling digital data to form descrambled data, the input/output unit comprising:input/output controlling means for supplying the received digital data or the descrambled data to the external unit and for supplying data received from the external unit to the descramble means; and an interface between said input/output controlling means and the external unit; said input/output controlling means including: extracting means for extracting only predetermined data from the received digital data or the descrambled data, and for outputting the extracted data to said interface; first selecting means for selecting one of the received digital data and the data received from the external unit as first selected data, and for supplying the first selected data to the descramble means; second selecting means for selecting one of the received digital data and the descrambled data as second selected data, and for supplying the second selected data to said extracting means; and third selecting means for selecting one of the extracted data from said extracting means and the data received from the external unit as third selected data, for supplying the third selected data to the external unit when the third selected data is the extracted data from said extracting means, and for supplying the third selected data to the descramble means when the third selected data is the data received from the external unit.