Information recording and reproducing apparatus

An information recording and reproducing apparatus comprising:

• first means for scrambling main data in response to address information to get scramble-resultant data defined as first basic data;
• second means for adding first error correction code data to the first basic data to get a first data signal of a first error correction code system;
• third means for adding second error correction code data to second basic data inclusive of the address information to get a second data signal of a second error correction code system independent of the first error correction code system;
• fourth means for combining the first data signal and the second data signal into a composite signal divided into error correction blocks;
• fifth means for recording the composite signal on a recording medium for every error correction block;
• sixth means for reproducing a recorded signal from a recording medium to get a reproduced signal for every error correction block;
• seventh means for correcting errors in a first data signal of the first error correction code system in the reproduced signal to get first correction-resultant data;
• eighth means for correcting errors in a second data signal of the second error correction code system in the reproduced signal independently of the error correction by the seventh means to get second correction-resultant data;
• ninth means for extracting all pieces of address information from the second correction-resultant data for every error correction block;
• tenth means for subjecting all the address information pieces extracted by the ninth means to error checks to decide whether at least one of all the address information pieces is correct and whether all the address information pieces are erroneous;
• eleventh means for, when the tenth means decides that at least one of all the address information pieces is correct, setting a descramble initial value in response to the correct address information piece;
• twelfth means for, when the tenth means decides that all the address information pieces are erroneous, estimating a correct address information piece from an address information piece associated with a previous error correction block and setting the descramble initial value in response to the estimated correct address information piece;
• and
• thirteenth means for descrambling the first correction-resultant data in response to the descramble initial value set by one of the eleventh means and the twelfth means for every error correction block.

A computer program for enabling a computer to operate as a plurality of means which include:

• first means for scrambling user data in response to address information to get scramble-resultant data;
• second means for adding first error correction code data and second error correction code data to the scramble-resultant data and the address information to get addition-resultant data placed in error correction blocks as a signal to be recorded on a recording medium;
• third means for correcting errors in a signal reproduced from a recording medium in response to first error correction code data and second error correction code data contained in the signal reproduced from the recording medium to get correction-resultant data for every error correction block;
• fourth means for extracting all pieces of address information from the correction-resultant data for every error correction block;
• fifth means for subjecting all the address information pieces extracted by the fourth means to error checks to decide whether at least one of all the address information pieces is correct and whether all the address information pieces are erroneous;
• sixth means for, when the fifth means decides that at least one of all the address information pieces is correct, setting a descramble initial value in response to the correct address information piece;
• seventh means for, when the fifth means decides that all the address information pieces are erroneous, estimating a correct address information piece from an address information piece associated with a previous error correction block and setting the descramble initial value in response to the estimated correct address information piece;
• and
• eighth means for descrambling the correction-resultant data in response to the descramble initial value set by one of the sixth means and the seventh means for every error correction block.

A computer program for enabling a computer to operate as a plurality of means which include:

• first means for scrambling main data in response to address information to get scramble-resultant data defined as first basic data;
• second means for adding first error correction code data to the first basic data to get a first data signal of a first error correction code system;
• third means for adding second error correction code data to second basic data inclusive of the address information to get a second data signal of a second error correction code system independent of the first error correction code system;
• fourth means for combining the first data signal and the second data signal into a composite signal divided into error correction blocks as a signal to be recorded on a recording medium;
• fifth means for correcting errors in a first data signal of the first error correction code system in a signal reproduced from a recording medium to get first correction-resultant data;
• sixth means for correcting errors in a second data signal of the second error correction code system in the signal reproduced from the recording medium independently of the error correction by the fifth means to get second correction-resultant data;
• seventh means for extracting all pieces of address information from the second correction-resultant data for every error correction block;
• eighth means for subjecting all the address information pieces extracted by the seventh means to error checks to decide whether at least one of all the address information pieces is correct and whether all the address information pieces are erroneous;
• ninth means for, when the eighth means decides that at least one of all the address information pieces is correct, setting a descramble initial value in response to the correct address information piece;
• tenth means for, when the eighth means decides that all the address information pieces are erroneous, estimating a correct address information piece from an address information piece associated with a previous error correction block and setting the descramble initial value in response to the estimated correct address information piece;
• and
• eleventh means for descrambling the first correction-resultant data in response to the descramble initial value set by one of the ninth means and the tenth means for every error correction block.

An information decoding apparatus for use with a recording medium on which a modulation-resultant signal is recorded by an information recording apparatus operating to (1) scramble user data in response to address information to get scramble-resultant data;

• (2) add error correction code data of plural different types to the scramble-resultant data and the address information to get addition-resultant data placed in error correction blocks;
• and (3) subject the addition-resultant data to modulation to get the modulation-resultant signal;
• the information decoding apparatus comprising:
• first means for reproducing a modulation-resultant signal from the recording medium to get a reproduced signal;
• second means for subjecting the reproduced signal to demodulation to get demodulation-resultant data;
• third means for extracting address information from the demodulation-resultant data;
• fourth means for subjecting the address information extracted by the third means to error correction to get correction-resultant address information;
• fifth means for implementing interpolation on the basis of an address continuity to get interpolation-resultant address information corresponding to the address information extracted by the third means;
• sixth means for correcting errors in the demodulation-resultant data in response to error correction code data of the plural different types contained in the demodulation-resultant data to get correction-resultant data for every error correction block;
• seventh means for extracting all pieces of address information from the correction-resultant data for every error correction block;
• eighth means for subjecting all the address information pieces extracted by the seventh means to error checks to decide whether at least one of all the address information pieces is correct and whether all the address information pieces are erroneous;
• ninth means for, when the eighth means decides that at least one of all the address information pieces is correct, setting a descramble initial value in response to the correct address information piece;
• tenth means for, when the eighth means decides that all the address information pieces are erroneous, setting the descramble initial value in response to one of (1) the correction-resultant address information and (2) the interpolation-resultant address information;
• and
• eleventh means for descrambling the correction-resultant data in response to the descramble initial value set by one of the ninth means and the tenth means for every error correction block.

An information decoding apparatus for use with a recording medium on which a modulation-resultant signal is recorded by an information recording apparatus operating to (1) scramble main data in response to address information to get scramble-resultant data defined as first basic data;

• (2) add first error correction code data to the first basic data to get a first data signal of a first error correction code system;
• (3) add second error correction code data to second basic data inclusive of the address information to get a second data signal of a second error correction code system independent of the first error correction code system;
• (4) combining the first data signal and the second data signal into a composite signal divided into error correction blocks;
• and (5) subject the composite signal to modulation to get the modulation-resultant signal;
• the information decoding apparatus comprising:
• first means for reproducing a modulation-resultant signal from the recording medium to get a reproduced signal;
• second means for subjecting the reproduced signal to demodulation to get a demodulation-resultant signal including a demodulation-resultant first data signal and a demodulation-resultant second data signal;
• third means for extracting address information from second basic data in the demodulation-resultant second data signal;
• fourth means for subjecting the address information extracted by the third means to error correction to get correction-resultant address information;
• fifth means for implementing interpolation on the basis of an address continuity to get interpolation-resultant address information corresponding to the address information extracted by the third means;
• sixth means for subjecting the demodulation-resultant first data signal and the demodulation-resultant second data signal to independent error corrections respectively to get correction-resultant data for every error correction block;
• seventh means for extracting all pieces of address information from second basic data in the correction-resultant data for every error correction block;
• eighth means for subjecting all the address information pieces extracted by the seventh means to error checks to decide whether at least one of all the address information pieces is correct and whether all the address information pieces are erroneous;
• ninth means for, when the eighth means decides that at least one of all the address information pieces is correct, setting a descramble initial value in response to the correct address information piece;
• tenth means for, when the eighth means decides that all the address information pieces are erroneous, setting the descramble initial value in response to one of (1) the correction-resultant address information and (2) the interpolation-resultant address information;
• and
• eleventh means for descrambling the correction-resultant data in response to the descramble initial value set by one of the ninth means and the tenth means for every error correction block.

A computer program for use in an information decoding apparatus, the information decoding apparatus being for use with a recording medium on which a modulation-resultant signal is recorded by an information recording apparatus operating to (1) scramble user data in response to address information to get scramble-resultant data;

• (2) add error correction code data of plural different types to the scramble-resultant data and the address information to get addition-resultant data placed in error correction blocks;
• and (3) subject the addition-resultant data to modulation to get the modulation-resultant signal;
• the computer program enabling a computer to operate as a plurality of means which include:
• first means for subjecting a signal reproduced from the recording medium to demodulation to get demodulation-resultant data;
• second means for extracting address information from the demodulation-resultant data;
• third means for subjecting the address information extracted by the second means to error correction to get correction-resultant address information;
• fourth means for implementing interpolation on the basis of an address continuity to get interpolation-resultant address information corresponding to the address information extracted by the second means;
• fifth means for correcting errors in the demodulation-resultant data in response to error correction code data of the plural different types contained in the demodulation-resultant data to get correction-resultant data for every error correction block;
• sixth means for extracting all pieces of address information from the correction-resultant data for every error correction block;
• seventh means for subjecting all the address information pieces extracted by the sixth means to error checks to decide whether at least one of all the address information pieces is correct and whether all the address information pieces are erroneous;
• eighth means for, when the seventh means decides that at least one of all the address information pieces is correct, setting a descramble initial value in response to the correct address information piece;
• ninth means for, when the seventh means decides that all the address information pieces are erroneous, setting the descramble initial value in response to one of (1) the correction-resultant address information and (2) the interpolation-resultant address information;
• and
• tenth means for descrambling the correction-resultant data in response to the descramble initial value set by one of the eighth means and the ninth means for every error correction block.

A computer program for use in an information decoding apparatus, the information decoding apparatus being for use with a recording medium on which a modulation-resultant signal is recorded by an information recording apparatus operating to (1) scramble main data in response to address information to get scramble-resultant data defined as first basic data;

• (2) add first error correction code data to the first basic data to get a first data signal of a first error correction code system;
• (3) add second error correction code data to second basic data inclusive of the address information to get a second data signal of a second error correction code system independent of the first error correction code system;
• (4) combining the first data signal and the second data signal into a composite signal divided into error correction blocks;
• and (5) subject the composite signal to modulation to get the modulation-resultant signal;
• the computer program enabling a computer to operate as a plurality of means which include:
• first means for subjecting a signal reproduced from the recording medium to demodulation to get a demodulation-resultant signal including a demodulation-resultant first data signal and a demodulation-resultant second data signal;
• second means for extracting address information from second basic data in the demodulation-resultant second data signal;
• third means for subjecting the address information extracted by the second means to error correction to get correction-resultant address information;
• fourth means for implementing interpolation on the basis of an address continuity to get interpolation-resultant address information corresponding to the address information extracted by the second means;
• fifth means for subjecting the demodulation-resultant first data signal and the demodulation-resultant second data signal to independent error corrections respectively to get correction-resultant data for every error correction block;
• sixth means for extracting all pieces of address information from second basic data in the correction-resultant data for every error correction block;
• seventh means for subjecting all the address information pieces extracted by the sixth means to error checks to decide whether at least one of all the address information pieces is correct and whether all the address information pieces are erroneous;
• eighth means for, when the seventh means decides that at least one of all the address information pieces is correct, setting a descramble initial value in response to the correct address information piece;
• ninth means for, when the seventh means decides that all the address information pieces are erroneous, setting the descramble initial value in response to one of (1) the correction-resultant address information and (2) the interpolation-resultant address information;
• and
• tenth means for descrambling the correction-resultant data in response to the descramble initial value set by one of the eighth means and the ninth means for every error correction block.

A data processing apparatus comprising:

• first means for correcting errors in a first data signal of a first error correction code system in a composite signal to get first correction-resultant data;
• second means for correcting errors in a second data signal of a second error correction code system in the composite signal to get second correction-resultant data, the second error correction code system being independent of the first error correction code system;
• third means for deciding whether at least one of all address information pieces in the second correction-resultant data for every error correction block is correct and whether all the address information pieces are erroneous;
• fourth means for, when the third means decides that at least one of all the address information pieces is correct, setting a descramble initial value in response to the correct address information piece;
• fifth means for, when the third means decides that all the address information pieces are erroneous, estimating a correct address information piece from an address information piece associated with a previous error correction block and setting the descramble initial value in response to the estimated correct address information piece;
• and
• sixth means for descrambling the first correction-resultant data in response to the descramble initial value set by one of the fourth means and the fifth means for every error correction block.

A data processing apparatus comprising:

• first means for correcting errors in data in each of segments of a composite signal to get correction-resultant data;
• second means for deciding whether at least one of all address information pieces in each of segments of the composite signal is correct and whether all the address information pieces in each of segments of the composite signal are erroneous;
• third means for, when the second means decides that at least one of all the address information pieces is correct, setting a descramble initial value in response to the correct address information piece;
• fourth means for, when the second means decides that all the address information pieces are erroneous, implementing interpolation on the basis of an address continuity to get an interpolation-resultant address information piece corresponding to the address information pieces in each of segments of the composite signal and setting the descramble initial value in response to the interpolation-resultant address information piece;
• and
• fifth means for descrambling the correction-resultant data in response to the descramble initial value set by one of the third means and the fourth means.