Memory selecting system for scrambled television receiver

Details Memory selecting system for scrambled television receiver Memory selecting system for scrambled television receiver

1984-03-22

1986-12-09

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358121, 358123, 358124, 360 27, H04N 7167, G11B 502

Patent

active

046283595

ABSTRACT:
A scrambled television program that is received and recorded in a scrambled fashion includes program code and corresponding key codes for use in descrambling the recorded scrambled signal. The program codes and key codes are retained in a memory so that upon reproduction the key code can be read out of the memory and fed to a descramble pattern generator for descrambling the reproduced scrambled signal. By placing the program code and key code at the end of the scrambled program the scrambled signal cannot be descrambled until the entire program has been first received. By dividing the memory into permanent and temporary memories and adding an identification code to the transmitted scrambled signal, which selects either the permanent or temporary memory, and counting the number of times that the temporary memory is read out there can be a limitation placed on the number of times that the scrambled program is reproduced and decoded for viewing. Once a selected number is reached the contents of the temporary memory are erased, thereby preventing descrambling of the reproduced signal.

REFERENCES:
patent: 4225884 (1980-09-01), Block et al.
patent: 4278837 (1981-07-01), Best
patent: 4460922 (1984-07-01), Ensinger et al.
patent: 4514761 (1985-04-01), Merrell et al.
patent: 4533949 (1985-08-01), Fujimura et al.

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