Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
75 words
An information recording and reproducing apparatus comprising means including a recording medium (11) having an information recording region divided into a pluraltiy of sectors each having an address part (1) recorded with an address signal and a data recording part (5) to be recorded with data, and means (10) for overwriting a predetermined signal in the address part of a sector thereby to make the reproduction of the sector address of the address part impossible.
Claim 2
Dependent Claim
75 words
An information recording and reproducing apparatus comprising means including a recording medium (11) having an information recording region divided into a pluraltiy of sectors each having an address part (1) recorded with an address signal and a data recording part (5) to be recorded with data, and means (10) for overwriting a predetermined signal in the address part of a sector thereby to make the reproduction of the sector address of the address part impossible.
Claim 3
Dependent Claim
106 words
An information recording and reproducing apparatus according to Claim 1, wherein the address part (1) of each sector includes an address mark (2) indicating the beginning of the address data, an address data portion (3) indicating the address of the sector, and a CRC portion (4) making up a check signal, said apparatus further comprising overwriting means wherein a predetermined signal not longer than the CRC portion is overwritten on selected one of the sector address portion and the CRC portion so that a CRC error may be caused in subsequent reproduction therefrom thereby to make reproduction of the sector address of the address part impossible.
Claim 4
Dependent Claim
93 words
An information recording and reproducing apparatus according to Claim 2, wherein said recording-reproducing means includes means (7, 8) for adding to data to be recorded and encoding the address of the sector where the data is to be recorded in recording mode, and means for designating the address recorded in the data as a sector address wherefrom the data is to be reproduced in reproduction mode, wherein a predetermined signal is overwritten by said overwriting means in the address part of the sector the recorded data of which is required to be protected.
Claim 5
Dependent Claim
101 words
An information recording and reproducing apparatus anyone of according to/Claims 1 to 3,further comprising means (6) for changing the binary level in detecting an address from a reproduced address signal, wherein the level is changed by said level change means (6) to detect an address from the reproduced address signal with a reduced reproduction sensitivity in recording mode, and the address thus detected is compared with an address to be recorded so that when they fail to coincide with each other, a predetermined signal is overwritten in the address part thereby to make subsequent reproduction of the particular address part impossible.
Claim 6
Dependent Claim
103 words
An optical disc comprising an information recording region divided into a plurality of sectors each including an address part (1) recorded with an address signal and a data recording part (5) to be recorded with data, wherein the binary level in reproducing the address from a reproduced address signal obtained by reproduction of the address part is changed and the reproduced address is compared with the sector address of a relevant sector, so that when said addresses fail to coincide with each other, a predetermined signal is overwritten on the address part thereby to make subsequent reproduction of the particular address part impossible.
Claim 7
Dependent Claim
103 words
An optical disc comprising an information recording region divided into a plurality of sectors each including an address part (1) recorded with an address signal and a data recording part (5) to be recorded with data, wherein the binary level in reproducing the address from a reproduced address signal obtained by reproduction of the address part is changed and the reproduced address is compared with the sector address of a relevant sector, so that when said addresses fail to coincide with each other, a predetermined signal is overwritten on the address part thereby to make subsequent reproduction of the particular address part impossible.
Claim 8
Dependent Claim
86 words
An optical disc according to Claim 5, wherein the address part (1) of a sector includes an address mark . portion (2) indicating the beginning of the address data and a CRC portion (4) making up a check signal therefore, wherein a predetermined signal not longer than the CRC portion is overwritten in selected one of the sector address portion and the CRC portion, so that a CRC error may be caused by subsequent reproduction thereby to make subsequent reproduction of the particlar address part impossible.