System for evaluation of a subcode

Claim 1

A method for evaluation of a subcode of a digital information transmission comprising providing data blocks of a digital signal including a subcode block of several segments and associated with a large redundancy as an additional signal; evaluating separately each segment of the subcode corresponding to a data block; feeding the data of a selected segment of a subcode block to the scanner of a single period counter, where the single period counter counts the number of read in segments; storing the data of the selected segment in a first register; feeding the data of a successive segment of a subcode block to the scanner; comparing the data stored in a first register with the data of the successive segment; setting a flag according to the result of the comparing step.

Claim 2

A method for evaluation of a subcode of a digital information transmission comprising providing data blocks of a digital signal including a subcode block of several segments and associated with a large redundancy as an additional signal; evaluating separately each segment of the subcode corresponding to a data block; feeding the data of a selected segment of a subcode block to the scanner of a single period counter, where the single period counter counts the number of read in segments; storing the data of the selected segment in a first register; feeding the data of a successive segment of a subcode block to the scanner; comparing the data stored in a first register with the data of the successive segment; setting a flag according to the result of the comparing step.

Claim 12

An apparatus for evaluation of a subcode of a digital information transmission comprising a data reader; a first register connected to the data reader; a second register connected to the data reader; a third register connected to the data reader; a control circuit connected to the first register, to the second register and to the third register; a first gate connected to the control circuit and to the first register and to the second register; a second gate connected to the control circuit and to the third register and to the first gate; a first comparison stage connected to an output of the first register and to an output of the second register; a second comparison stage connected to an output of the first register and to an output of the third register; a first error detection stage connected to an output of the first comparison stage and to the control circuit; a second error detection stage connected to an output of the second comparison stage and to the control circuit; an AND-gate connected to an output of the first error detection stage and to an output of the second error detection stage; and a switch element connected to the first register and to an output of the AND-gate.

Claim 13

An apparatus for evaluation of a subcode of a digital information transmission comprising a data reader; a first register connected to the data reader; a second register connected to the data reader; a third register connected to the data reader; a control circuit connected to the first register, to the second register and to the third register; a first gate connected to the control circuit and to the first register and to the second register; a second gate connected to the control circuit and to the third register and to the first gate; a first comparison stage connected to an output of the first register and to an output of the second register; a second comparison stage connected to an output of the first register and to an output of the third register; a first error detection stage connected to an output of the first comparison stage and to the control circuit; a second error detection stage connected to an output of the second comparison stage and to the control circuit; an AND-gate connected to an output of the first error detection stage and to an output of the second error detection stage; and a switch element connected to the first register and to an output of the AND-gate.

Claim 14

A method for evaluation of a subcode of a digital information transmission comprising providing data blocks of a digital signal, wherein the digital signal is produced from a compact disk, and wherein the digital signal includes a subcode block of several segments and where the digital signal is associated with a large redundancy as an additional signal relative to a primary digital information transmission signal; storing data of a selected segment in a first register; storing the data of an immediately successive segment in a second register if the contents of the stored segment and of the successive segment are different; setting a flag corresponding to an incongruence of the two segments; and evaluating separately each segment of the subcode corresponding to a data block.

Claim 15

A method for evaluation of a subcode of a digital information transmission comprising providing data blocks of a digital signal, wherein the digital signal is produced from a compact disk, and wherein the digital signal includes a subcode block of several segments and where the digital signal is associated with a large redundancy as an additional signal relative to a primary digital information transmission signal; storing data of a selected segment in a first register; storing the data of an immediately successive segment in a second register if the contents of the stored segment and of the successive segment are different; setting a flag corresponding to an incongruence of the two segments; and evaluating separately each segment of the subcode corresponding to a data block.