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    • 4. 发明授权
    • Video recording apparatus
    • 录像设备
    • US4104683A
    • 1978-08-01
    • US669925
    • 1976-03-24
    • Edward Maurice Granger
    • Edward Maurice Granger
    • H04N5/921H04N5/79H04N5/795
    • H04N5/921
    • Apparatus for directly recording television signals on a magnetic medium strips out sync and blanking information. Low frequency components of the television signals are time-compressed, i.e., frequency shifted, and recorded as a substitute for the stripped-out sync and blanking information. Thus, high frequency components of each video line are recorded, followed by that line's low frequency components, thereby facilitating the playback of low frequency information. In a preferred form, the low frequency video information is time-compressed sufficiently to provide time, during the time slot which corresponds to sync and blanking information, for the recording of reference signal information. During playback, the reference signal information is employed to set the gain of the playback circuit.
    • 用于在磁性介质上直接记录电视信号的装置剥离同步和消隐信息。 电视信号的低频分量被时间压缩,即频移,并被记录为取代的同步和消隐信息。 因此,记录每个视频行的高频分量,随后是该线的低频分量,从而便于低频信息的重放。 在优选形式中,低频视频信息被充分时间压缩,以在对应于同步和消隐信息的时隙期间提供用于记录参考信号信息的时间。 在回放期间,使用参考信号信息来设定回放电路的增益。
    • 5. 发明授权
    • Video recording apparatus
    • 录像设备
    • US4063290A
    • 1977-12-13
    • US669924
    • 1976-03-24
    • Frederic Howell MetildiEdward Maurice Granger
    • Frederic Howell MetildiEdward Maurice Granger
    • H04N5/921H04N5/926H04N5/79
    • H04N5/921H04N5/926
    • Apparatus for directly recording television signals on a magnetic medium strips out sync and blanking information. Low frequency components of the television signals are time compressed, i.e. frequency shifted, and recorded as a substitute for the stripped-out sync and blanking information. Thus, high frequency components of each video line are recorded, followed by that line's low frequency components, thereby facilitating the playback of low frequency information. The low frequency video information is time compressed sufficiently to provide time, during the time slot which corresponds to sync and blanking information, for the recording of reference signal information. During playback, the reference signal information is employed to set the gain of the playback circuit. In time compressing the low frequency information, the video signal content of a line is sampled at a predetermined rate. Each sample is then quantized for purposes of improving playback signal-to-noise ratio, i.e. the effect of tape modulation, and other, noise is nullified by sample quantization. To assure against the loss during playback of significant low frequency signal information, the quantization bits are rearranged according to their significance, bits of higher significance being recorded in proximity to the reference signal information, and vice versa.
    • 用于在磁性介质上直接记录电视信号的装置剥离同步和消隐信息。 电视信号的低频分量被时间压缩,即频移,并被记录为取代的同步和消隐信息。 因此,记录每个视频行的高频分量,随后是该线的低频分量,从而便于低频信息的重放。 低频视频信息被足够的时间压缩,以在对应于同步和消隐信息的时隙期间提供用于记录参考信号信息的时间。 在回放期间,使用参考信号信息来设定回放电路的增益。 在对低频信息进行压缩的同时,以预定的速率对行的视频信号内容进行采样。 然后,为了改善重放信噪比(即,带调制的效果)等,对每个样本进行量化,另外,样本量化使噪声无效。 为了防止重放低频信号信息的播放过程中的丢失,量化比特根据其重要性重新排列,更高有效位被记录在参考信号信息附近,反之亦然。