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    • 4. 发明授权
    • Digital video tape recorder
    • 数字录像机
    • US5510903A
    • 1996-04-23
    • US468127
    • 1995-06-06
    • Osamu Matsumura
    • Osamu Matsumura
    • H04N5/7826H04N5/782H04N5/783H04N5/92H04N9/804H04N9/88H04N9/888H04N19/42H04N19/46H04N19/60H04N19/625H04N19/65H04N19/70H04N19/85H04N19/88H04N5/76
    • H04N9/8047H04N5/783H04N9/888
    • In a digital video tape recorder which employs discrete cosine transformation and variable length coding for compressing the data to be recorded, the necessity of an additional signal line for transmission of information incidental to the principal data is eliminated, and a processing margin is obtained in track units upon variable speed reproduction and the like. The digital video tape recorder samples an NTSC signal at a ratio of 4:1:1 or 4:2:0, transforms the sample data for each block of 8.times.8 data by DCT, encodes the transformed data into variable length codes so that 30 DCT blocks constitute a buffering unit having a fixed length to compress the data, and segmentally records the video signal obtained by the data compression divisionally in 10 tracks for each frame. In the digital video tape recorder, the frequency of a signal processing clock signal used for data compression is selected to be equal to 192/143 times the frequency of 13.5 MHz used for sampling the original analog component video signal when converting the same to digital form. A first blanking area for transmission of the incidental information is provided for each DCT block, and a second blanking area is provided for each track for obtaining the desired processing margin in track units upon variable speed reproduction and the like.
    • 在采用离散余弦变换和可变长度编码来压缩待记录数据的数字磁带录像机中,消除了附加信号线用于发送附属于主数据的信息的必要性,并且获得了处理余量 单位可变速度再现等。 数字录像机以4:1:1或4:2:0的比例采样NTSC信号,通过DCT对8x8数据的每个块进行采样数据变换,将变换后的数据编码为可变长度码,使30 DCT 块构成具有固定长度的缓冲单元以压缩数据,并且将通过数据压缩获得的视频信号分段地记录在每个帧的10个轨道中。 在数字录像机中,用于数据压缩的信号处理时钟信号的频率被选择为等于将原始模拟分量视频信号转换为数字形式时用于采样原始模拟分量视频信号的13.5MHz频率的192/143倍 。 为每个DCT块提供用于传输附带信息的第一消隐区域,并且为每个轨道提供第二消隐区域,以在可变速度再现等获得轨道单元中的期望处理余量。