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    • 7. 发明授权
    • Digital signal recording apparatus
    • 数字信号记录装置
    • US06215950B1
    • 2001-04-10
    • US08708703
    • 1996-09-05
    • Chiyoko MatsumiTatsuro JuriAkira IketaniMakoto GotoSusumu YamaguchiHideki OtakaShigeru AwamotoMasakazu NishinoTakao KashiroTadashi Ono
    • Chiyoko MatsumiTatsuro JuriAkira IketaniMakoto GotoSusumu YamaguchiHideki OtakaShigeru AwamotoMasakazu NishinoTakao KashiroTadashi Ono
    • H04N5783
    • H04N9/8047H04N5/78266H04N9/7921H04N9/8063H04N9/8205
    • The digital signal recording apparatus of the invention for recording a video signal on a recording medium, includes: a mode setting section for setting a recording mode, the recording mode being one of a standard recording mode and a long-time recording mode having a longer recording time than that of the standard recording mode; a sampling section for sampling the video signal at a sampling number corresponding to the recording mode set by the mode setting section, the sampling number when the selected recording mode is the long-time recording mode being smaller than the sampling number when the selected recording mode is the standard recording mode; a coding section for coding the video signal sampled by the sampling section at a compression rate corresponding to the recording mode set by the mode setting section, the compression rate when the selected recording mode is the long-time recording mode being higher than the compression rate when the selected recording mode is the standard recording mode; and a recording section for recording the video signal coded by the coding section on a recording medium.
    • 本发明的用于在记录介质上记录视频信号的数字信号记录装置包括:模式设置部分,用于设置记录模式,记录模式是标准记录模式和长时间记录模式之一 录制时间高于标准录音模式; 采样部分,用于以对应于由模式设置部分设置的记录模式的采样数采样视频信号,当所选择的记录模式是长时间记录模式时,当所选择的记录模式 是标准录音模式; 编码部分,用于以与由模式设置部分设置的记录模式对应的压缩率对采样部分采样的视频信号进行编码,当所选择的记录模式是长时间记录模式时的压缩率高于压缩率 当所选择的记录模式是标准记录模式时; 以及记录部分,用于将由编码部分编码的视频信号记录在记录介质上。
    • 9. 发明授权
    • Error compensation by a ramp waveform having a high signal-to-noise ratio
    • 通过具有高信噪比的斜坡波形进行误差补偿
    • US4757392A
    • 1988-07-12
    • US884698
    • 1986-07-11
    • Shigeru AwamotoTatsushi Bannai
    • Shigeru AwamotoTatsushi Bannai
    • H04N5/919H04N5/931H04N5/782
    • H04N5/919H04N5/931
    • A signal processing circuit for a video recording and reproducing apparatus comprises a ramp inserting circuit for inserting a ramp waveform at periodic intervals into a video signal during recording. The ramp waveform varies linearly as a function of time from the minimum to the maximum level of the video signal. On playback, the inserted ramp is periodically detected from a reproduced video signal by a ramp detector. The waveform of the detected ramp is corrected to improve its signal-to-noise ratio by an averaging circuit and applied to a transfer circuit having a transfer function describing the relationship between the original ramp waveform and the corrected ramp waveform. The waveform of the reproduced video signal is transformed according to the transfer function.
    • 用于视频记录和再现装置的信号处理电路包括斜坡插入电路,用于在记录期间将周期性间隔的斜坡波形插入到视频信号中。 斜坡波形作为从视频信号的最小值到最大电平的时间的函数呈线性变化。 在播放时,通过斜坡检测器从再现的视频信号周期性地检测插入的斜坡。 校正所检测的斜坡的波形以通过平均电路来改善其信噪比,并施加到具有描述原始斜坡波形和校正斜坡波形之间的关系的传递函数的传送电路。 再生视频信号的波形根据传递函数变换。