Method of and apparatus for recording an information signal
First Claim
1. A method of recording an information signal, in particular an EFM-modulated signal, on a record carrier, which information signal comprises time-code signals indicating the time positions of the associated signal portions within the information signal and which alternate with time-synchronisation signals, in which method a preformed servo track of the record carrier is scanned, an information pattern of recording marks, corresponding to the information signal, being recorded in the servo track and the servo-track portion intended for recording being provided with a periodic track modulation which can be distinguished from the information pattern, characterized in that said record carrier is of a type in which the frequency of the track modulation is modulated in conformity with a position-information signal, the position-information signal comprising position-code signals which indicate the positions of the associated track portions relative to the beginning of the servo track, which position-code signals alternate with position-synchronisation signals, and in that during recording of the information signals a fixed phase relationship is maintained between the time-synchronisation signals and the position-synchronisation signals represented by the track modulation of the track portions being scanned.
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Abstract
A method of and apparatus (FIG. 4) for recording an information signal (Vi), in particular an EFM-modulated signal, are revealed, which information signal comprises time-code signals which alternate with first time-synchronization signals. The record carrier (1) which is employed is provided with a preformed servo track (4) which exhibits a periodic track modulation whose frequency is modulated in conformity with the position-information signal (FIG. 2). The position-information signal (FIG. 2) comprises position-code signals (12) which alternate with position-synchronization signals (11). During recording a fixed phase relationship between the time-synchronization signals and the position-synchronization signals (11) is maintained, so that the portion (141) of the servo track (4) in which the time-synchronization signals are recorded are situated at fixed positions relative to the servo-track portions (140) which represent the position-synchronization signals (11).
201 Citations
9 Claims
- 1. A method of recording an information signal, in particular an EFM-modulated signal, on a record carrier, which information signal comprises time-code signals indicating the time positions of the associated signal portions within the information signal and which alternate with time-synchronisation signals, in which method a preformed servo track of the record carrier is scanned, an information pattern of recording marks, corresponding to the information signal, being recorded in the servo track and the servo-track portion intended for recording being provided with a periodic track modulation which can be distinguished from the information pattern, characterized in that said record carrier is of a type in which the frequency of the track modulation is modulated in conformity with a position-information signal, the position-information signal comprising position-code signals which indicate the positions of the associated track portions relative to the beginning of the servo track, which position-code signals alternate with position-synchronisation signals, and in that during recording of the information signals a fixed phase relationship is maintained between the time-synchronisation signals and the position-synchronisation signals represented by the track modulation of the track portions being scanned.
- 6. An apparatus for recording an information signal having associated time synchronization signals on a record carrier having a servo track, which apparatus comprises scanning means for scanning the servo track with a specific scanning velocity which scanning means comprise write means for forming the information pattern of recording marks corresponding to the information signals with a specific recording velocity, characterized in that the apparatus comprises means for maintaining a fixed phase relationship between the time-synchronisation signals of the information signal and the position-synchronisation signals represented by the track portions being scanned by adaptation of the scanning and/or recording velocity.
Specification