Code-error correcting device

Claim 1

A code-error correcting device for use in an apparatus for transmitting digital information as well as address information, said code-error correcting device comprising: an address generating circuit for generating an address information signal indicating address information or data block information relating to address information; a pseudo-random-function generating circuit for receiving the address information signal as indicating an initial value for computing pseudo-random functions and responsive to the address information signal for generating pseudo-random function; and an adder circuit for computing the EXCLUSIVE OR of the digital information and an output of the pseudo-random function generating circuit and further supplying the value of the EXCLUSIVE OR to a digital modulator as an input thereof.

Claim 5

An apparatus for recording digital information on a recording medium and reproducing the recorded information therefrom, said apparatus having an encoder for generating signals indicating error-detecting-and-correcting code and an decoder for receiving digital demodulation information, to which is address information added, and for effecting error-correction of reproduced digital signal, said encoder including a first code-error correcting device and on the other hand said decoder including a second code-error correcting device, said first code-error correcting device comprising: an address generating circuit for generating an address information signal indicating address information or data block information relating to address information; a first pseudo-random-function generating circuit for receiving the address information signal as indicating a first initial value for computing pseudo-random functions and responsive to the address information signal for generating and outputting pseudo-random function; and a first adder circuit for computing the EXCLUSIVE OR of the digital information and an output of said first pseudo-random function generating circuit and further supplying the value of the EXCLUSIVE OR to a digital modulator as an input thereof, said second code-error correcting device comprising: a demodulation address generating circuit for generating a demodulation address information signal indicating demodulation address information or demodulation data block information relating to demodulation address information; a second pseud-random-function generating circuit for receiving the demodulation address information signal as indicating a second initial value, which is different from the first initial value, for computing pseudo-random function and responsive to the demodulation information signal for generating and outputting pseudo-random function different from the pseudo-random function outputted by said first pseud-random-function generating circuit; and a second adder circuit for calculating the EXCLUSIVE OR of the digital demodulation information and an output of the pseudo-random function generating circuit and further supplying the value of the EXCLUSIVE OR to a circuit for deriving the original digital information therefrom, thereby preventing erroneous data from outputting therefrom even if no error occurs in the receiving system thereof.

Claim 6

An apparatus for recording digital information on a recording medium and reproducing the recorded information therefrom, said apparatus having an encoder for generating signals indicating error-detecting-and-correcting code and an decoder for receiving digital demodulation information, to which is address information added, and for effecting error-correction of reproduced digital signal, said encoder including a first code-error correcting device and on the other hand said decoder including a second code-error correcting device, said first code-error correcting device comprising: an address generating circuit for generating an address information signal indicating address information or data block information relating to address information; a first pseudo-random-function generating circuit for receiving the address information signal as indicating a first initial value for computing pseudo-random functions and responsive to the address information signal for generating and outputting pseudo-random function; and a first adder circuit for computing the EXCLUSIVE OR of the digital information and an output of said first pseudo-random function generating circuit and further supplying the value of the EXCLUSIVE OR to a digital modulator as an input thereof, said second code-error correcting device comprising: a demodulation address generating circuit for generating a demodulation address information signal indicating demodulation address information or demodulation data block information relating to demodulation address information; a second pseud-random-function generating circuit for receiving the demodulation address information signal as indicating a second initial value, which is different from the first initial value, for computing pseudo-random function and responsive to the demodulation information signal for generating and outputting pseudo-random function different from the pseudo-random function outputted by said first pseud-random-function generating circuit; and a second adder circuit for calculating the EXCLUSIVE OR of the digital demodulation information and an output of the pseudo-random function generating circuit and further supplying the value of the EXCLUSIVE OR to a circuit for deriving the original digital information therefrom, thereby preventing erroneous data from outputting therefrom even if no error occurs in the receiving system thereof.

Claim 11

A method of processing for transmission digital information including address information, including the steps of: generating an address information signal indicating address information or data block information relating to address information; generating a pseudo-random function in response to the address information signal by using the address information signal as indicating an initial value for computing pseudo-random functions; and computing the EXCLUSIVE OR of the digital information and the result of the pseudo-random function generation and further supplying the value of the EXCLUSIVE OR to a digital modulator as an input thereof.

Claim 12

A method of processing for transmission digital information including address information, including the steps of: generating an address information signal indicating address information or data block information relating to address information; generating a pseudo-random function in response to the address information signal by using the address information signal as indicating an initial value for computing pseudo-random functions; and computing the EXCLUSIVE OR of the digital information and the result of the pseudo-random function generation and further supplying the value of the EXCLUSIVE OR to a digital modulator as an input thereof.

Claim 13

A method of processing received digital demodulation information to which address information is added, including the steps of: generating a modulation address information signal indicating demodulation address information or demodulation data block information relating to demodulation address information; generating a pseudo-random function in response to the demodulation information signal by using the demodulation address information signal as indicating an initial value for computing pseudo-random function; and calculating the EXCLUSIVE OR of the digital demodulation information and the result of the pseudo-­random function generation and further supplying the value of the EXCLUSIVE OR to a circuit for deriving the original digital information therefrom.

Claim 14

A method of processing received digital demodulation information to which address information is added, including the steps of: generating a modulation address information signal indicating demodulation address information or demodulation data block information relating to demodulation address information; generating a pseudo-random function in response to the demodulation information signal by using the demodulation address information signal as indicating an initial value for computing pseudo-random function; and calculating the EXCLUSIVE OR of the digital demodulation information and the result of the pseudo-­random function generation and further supplying the value of the EXCLUSIVE OR to a circuit for deriving the original digital information therefrom.

Claim 15

A method of recording digital information on a recording medium and reproducing the recorded information therefrom, including the steps of: generating signals indicating error-detecting-and-­correcting code by: generating an address information signal indicating address information or data block information relating to address information; generating a first pseudo-random function in response to the address information signal by using the address information signal as indicating a first initial value for computing pseudo-random functions; and computing the EXCLUSIVE OR of the digital information and the result of said first pseudo-random function generation and further supplying the value of the EXCLUSIVE OR to a digital modulator as an input thereof; and receiving digital demodulation information, to which address information is added, and effecting error-correction of reproduced digital signal by: generating a demodulation address information signal indicating demodulation address information or demodulation data block information relating to demodulation address information; generating a second pseudo-random function different from the first pseudo-random function in response to the demodulation information signal by using the demodulation address information signal as indicating a second initial value, which is different from the first initial value; and calculating the EXCLUSIVE OR of the digital demodulation information and the result of the second pseudo-random function generation and further supplying the value of the EXCLUSIVE OR to a circuit for deriving the original digital information therefrom, thereby preventing erroneous data from outputting therefrom even if no error occurs in the reception.

Claim 16

A method of recording digital information on a recording medium and reproducing the recorded information therefrom, including the steps of: generating signals indicating error-detecting-and-­correcting code by: generating an address information signal indicating address information or data block information relating to address information; generating a first pseudo-random function in response to the address information signal by using the address information signal as indicating a first initial value for computing pseudo-random functions; and computing the EXCLUSIVE OR of the digital information and the result of said first pseudo-random function generation and further supplying the value of the EXCLUSIVE OR to a digital modulator as an input thereof; and receiving digital demodulation information, to which address information is added, and effecting error-correction of reproduced digital signal by: generating a demodulation address information signal indicating demodulation address information or demodulation data block information relating to demodulation address information; generating a second pseudo-random function different from the first pseudo-random function in response to the demodulation information signal by using the demodulation address information signal as indicating a second initial value, which is different from the first initial value; and calculating the EXCLUSIVE OR of the digital demodulation information and the result of the second pseudo-random function generation and further supplying the value of the EXCLUSIVE OR to a circuit for deriving the original digital information therefrom, thereby preventing erroneous data from outputting therefrom even if no error occurs in the reception.