Patent EA-002613-B1 (EA)
Title: Method of registering a running time on an information carrier, information carrier and apparatus
Inventor: HEEMSKERK JACOBUS P J
IPC: G11B27/10
Filed: 2000-03-06
Abstract: 1. A method of registering a running time on an information carrier, the information carrier comprising main data and subcode data, the running time being indicated in a subcode channel by a subcode time expressed in accordance with, a predetermined format, characterized in that a pseudo-running time is described by incrementing the subcode time in accordance with a pseudo-tempo, which is different from an actual tempo, the actual tempo representing a tempo in accordance with the actual running time. 2. A method as claimed in claim 1, characterized in that the pseudo-tempo is smaller than the actual tempo. 3. A method as claimed in claim 2, characterized in that the pseudo-tempo is equal to half the actual tempo. 4. A method as claimed in claim 1, characterized in that a first pseudo-tempo is equal to the actual tempo up to a predetermined subcode time, and that, starting from said predetermined subcode time, a second pseudo-tempo is smaller than the actual tempo. 5. A method as claimed in claim 4, characterized in that the second pseudotempo is equal to half the actual tempo. 6. A method as claimed in claim 4 or 5, characterized in that the predetermined subcode time is or approximately is 80:00:00. 7. A method as claimed in claim 2, characterized in that a first pseudo-tempo is equal to the actual tempo up to a predetermined subcode time, and that, starting from said predetermined subcode time, a second pseudo-tempo is zero. 8. A method as claimed in claim 7, characterized in that the predetermined subcode time is or approximately is 99:59:74. 9. A method as claimed in claim 1, characterized in that a control code is used, this control code indicating the use of a subcode time in accordance with a pseudo-tempo which is different from the actual tempo. 10. A method as claimed in claim 2, characterized in that the pseudo-tempo is smaller than the actual tempo by expressing the subcode time in values exceeding the maximum possible values in accordance with the predetermined format. 11. A method of registering a running time of an information carrier, the running time being described by a subcode time in a subcode channel, the subcode time being expressed in minutes, seconds and frames, a number of bits for expressing the number of minutes of the subcode time being available in the subcode channel, characterized in that the number of bits is increased by using bits which are present in fields of the subcode channel, the field having a predefined purpose which is different from that for expressing the minutes of the subcode time. 12. A method as claimed in claim 11, characterized in that four bits of a ZERO field, which immediately precedes the bits representing the minutes of the subcode time, are used starting from the subcode time 99:59:74 to increase the number of digits available to express the number of minutes of the subcode time. 13. A method as claimed in claim 11, characterized in that a control code is used, this control code indicating the use of bits which are present in fields of the subcode channel, the field having a predefined purpose which is different from that for expressing the minutes of the subcode time. 14. An information carrier comprising main data, subcode data and tracks in which information is stored, the information carrier further comprising information about a running time of the information carrier, the running time being indicated in a subcode channel by a subcode time expressed in accordance with a predetermined format, characterized in that a pseudo-running time is described by incrementing the subcode time in accordance with a pseudo-tempo, which is different from an actual tempo, the actual tempo representing a tempo in accordance with the actual running time. 15. Information carrier for recording and storing main data and subcode data in tracks, the information carrier further comprising a pre-groove in which information about a running time indicated by a subcode time and a pre-groove time is stored, both the subcode time and the pre-groove time being expressed in accordance with a predetermined format, characterized in that a pseudo-running time is described in the pre-groove by incrementing the subcode time in accordance with a pseudo-tempo, which is different from an actual tempo, the actual tempo representing a tempo in accordance with the actual running time. 16. An information corner as claimed in claim 14 or 15, characterized in that the pseudo-tempo is smaller than the actual tempo. 17. An information corner as claimed in claim 14 or 15, characterized in that a first pseudo-tempo is equal to the actual tempo up to a predetermined subcode time, and that, starting from said predetermined subcode time, a second pseudo-tempo is zero. 18. An information carrier comprising main data, subcode data and tracks in which information is stored, the information corner further comprising information about a running time of the information carrier, the running time being indicated in a subcode channel by a subcode time expressed in minutes, seconds and frames, a number of bits for expressing the number of minutes of the subcode time being available in the subcode channel, characterized in that the number of bits is increased by using bits which are present in fields of the subcode channel, the field having a predefined purpose which is different from that for expressing the minutes of the subcode time. 19. Information carrier comprising main data, subcode data and tracks in which information can be stored, the information carrier further comprising information about a running time indicated by a subcode time stored in a pre-groove, the subcode time being expressed in minutes, seconds and frames, a number of bits for expressing the number of minutes of the subcode time being available in the subcode channel, characterized in that the number of bits is increased by using bits which are present in fields of the subcode channel, the field having a predefined purpose which is different from that for expressing the minutes of the subcode time. 20. An apparatus for reading an information carrier, comprising a system for detecting and reading information stored on the information carrier, the system comprising detection means and read-out means for receiving detector signals, the readout means being arranged to retrieve a subcode time, characterized in that the read-out means are further arranged to detect a control code indicating the presence of a subcode time which is incremented in accordance with a pseudo-tempo, which is different from an actual tempo, the actual tempo representing a tempo in accordance with the actual running time. 21. An apparatus for recording an information carrier, comprising write means for inducing a detectable change on a layer of the information carrier, the write means being arranged to write a subcode time on the information carrier, which subcode time is incremented in accordance with an actual tempo, the actual tempo representing a tempo in accordance with the actual running time, characterized in that the write means are further arranged to write a subcode time on the information carrier which subcode time is incremented in accordance with a pseudo-tempo which is different from an actual tempo.