| 摘要 |
THE PRESENT INVENTION RELATES TO A METHOD AND A CIRCUIT FOR WRITE PULSE GENERATION FOR RECORDING ON OPTICAL MEDIA, AND TO AN APPARATUS FOR WRITING TO OPTICAL RECORDING MEDIA USING SUCH METHOD. IT IS AN OBJECT OF THE INVENTION TO PROPOSE A RELIABLE AND ACCURATE METHOD FOR WRITE PULSE GENERATION WITH LOW HARDWARE COMPLEXITY. ACCORDING TO THE INVENTION, THIS OBJECT IS ACHIEVED BY A METHOD FOR WRITE PULSE GENERATION ON THE BASIS OF A BIT CLOCK, INCLUDING THE STEPS OF: - DIVIDING THE BIT CLOCK BY A FACTOR N, - MULTIPLYING THE DIVIDED BIT CLOCK BY A FACTOR N+X OR N-X WITH A PHASE-LOCKED LOOP (2, 3) TO OBTAIN SIGNAL EDGES WHICH ARE TIME-SHIFTED RELATIVE TO THE BIT CLOCK, - SELECTING A DESIRED TIME-SHIFTED SIGNAL EDGE, AND - MULTIPLYING THE SELECTED TIME-SHIFTED SIGNAL EDGE BY THE FACTOR N WITH A FURTHER PHASE-LOCKED LOOP (5, 6) TO OBTAIN A TIME-SHIFTED BIT CLOCK.
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