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    • 2. 发明授权
    • Video signal recording/reproducing system for increasing recording
density of a frequency modulated signal
    • 用于增加调频信号的记录密度的视频信号记录/再现系统
    • US5315402A
    • 1994-05-24
    • US932748
    • 1992-08-25
    • Yasuyuki ItoTakeshi KawabeYukio TojoTakeo Takase
    • Yasuyuki ItoTakeshi KawabeYukio TojoTakeo Takase
    • H04N5/85G11B11/18
    • H04N5/85
    • A video signal recording/reproducing device has at least a frequency modulating unit which FM modulates information to be recorded on an optical disk memory, a laser driving pulse generating unit for generating a laser driving pulse derived from the frequency-modulated signal generated by the frequency modulating unit and for modifying the duty factor of the laser driving pulse in accordance with the linear velocity of the optical disk memory where recording is taking place; and a recording unit for controlling the laser power during recording to an optimum value in accordance with the linear velocity of the optical disk memory where recording is taking place. This arrangement enables reduction of the minimal length of recording bits resulting in reproduced signals of a level sufficient for obtaining reproduced images of a fine quality addition enables increase of the recording capacity of the optical disk memory.
    • 视频信号记录/再现装置至少具有调制要记录在光盘存储器上的信息的频率调制单元,激光驱动脉冲产生单元,用于产生由频率产生的频率调制信号导出的激光驱动脉冲 并且用于根据正在进行记录的光盘存储器的线速度来修改激光驱动脉冲的占空因数; 以及记录单元,用于根据正在进行记录的光盘存储器的线速度将记录期间的激光功率控制到最佳值。 这种布置能够减少记录位的最小长度,从而产生足以获得精细质量附加的再现图像的再现信号,从而能够增加光盘存储器的记录容量。