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US 5,689,569 AGranted
Method and device for the utilization of electrical signals
AssigneeGemplus Card International
InventorPatrice Peyret
Life of this patent
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Abstract
An interface is made for a device for the exploitation of electrical signals between a receiver of this device and a device for the exploitation of these signals. The interface is capable of sending, alternatively, signals received by the receiver to an external circuit and signals delivered by the external circuit to the exploitation circuit. It is shown that this approach can be used to resolve problems of the scrambling and unscrambling of audio-visual signals.
Claims15
A device comprising:
- a receiver, the receiver receiving a digital electrical signal;
- a utilization device;
- an auxiliary circuit;
- a clock signal generator, the generator generating a clock signal having a plurality of clock cycles, each of the plurality of clock cycles having a first half-cycle and a second half-cycle;
- and
- a communications interface, the communications interface being coupled to the receiver, to the utilization device, and to the auxiliary circuit, and the communications interface including a demultiplexer, the demultiplexer relaying the digital electrical signal from the receiver to the auxiliary circuit in real time and during the first half-cycle of each of the plurality of clock cycles, and the demultiplexer relaying a processed signal corresponding to the digital electrical signal from the auxiliary circuit to the utilization device in real time and during the second half-cycle of each of the plurality of clock cycles.
3 more elements
A method of utilizing a digital electrical signal, the method comprising the steps of:
- generating a clock signal, the clock signal having a plurality of clock cycles, each of the plurality of clock cycles having a first half-cycle and a second half-cycle;
- receiving the digital electrical signal in a receiver;
- transmitting the digital electrical signal from the receiver to an auxiliary circuit during the first half-cycle of each of the plurality of clock cycles, each performance of the transmitting step further including the steps of:
- transmitting the digital electrical signal from the receiver to a demultiplexer, and then
- transmitting the digital electrical signal from the demultiplexer to the auxiliary circuit;
- processing the digital electrical signal in the auxiliary circuit to form a processed digital signal;
- transmitting the processed digital electrical signal from the auxiliary circuit to a utilization device during the second half-cycle of each of the plurality of clock cycles, each performance of the transmitting step further including the steps of:
- transmitting the processed digital electrical signal from the auxiliary circuit to the demultiplexer, and then
- transmitting the processed digital electrical signal from the demultiplexer to the utilization circuit;
- and utilizing the processed digital electrical signal with the utilization device.
7 more elements
A method of utilizing a digital electrical signal, the method comprising the steps of:
- generating a clock signal, the clock signal having a plurality of clock cycles, each of the plurality of clock cycles having a first half-cycle and a second half-cycle;
- receiving the digital electrical signal in a receiver;
- synchronizing the clock signal with the digital electrical signal;
- extracting an enciphered scrambling sequence and a scrambled signal from the digital electrical signal;
- transmitting the enciphered scrambling sequence and the scrambled signal from the receiver to an auxiliary circuit during the first half-cycle of each of the plurality of clock cycles, each performance of the transmitting step further including the steps of:
- transmitting the enciphered scrambling sequence and the scrambled signal from the receiver to a demultiplexer, and then
- transmitting the enciphered scrambling sequence and the scrambled signal from the demultiplexer to the auxiliary circuit;
- processing the enciphered scrambling sequence and the scrambled signal in the auxiliary circuit to form a descrambled signal, the processing step including the steps of
- ascertaining that a user is entitled access to the scrambled signal,
- deciphering the enciphered scrambling sequence, the occurrence of the deciphering step being contingent upon the ascertainment that the user is entitled access to the scrambled signal,
- descrambling the scrambled signal using the deciphered scrambling sequence,
- thereby producing the descrambled signal;
- transmitting the descrambled signal from the auxiliary circuit to the utilization device during the second half-cycle of each of the plurality of clock cycles, each performance of the transmitting step further including the steps of:
- transmitting the descrambled signal from auxiliary circuit to the demultiplexer, and then
- transmitting the descrambled signal from the demultiplexer to the utilization device;
- and utilizing the descrambled signal with the utilization device.
13 more elements
Dependencies are inferred from the claim text.