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    • 3. 发明授权
    • Method and apparatus for multiplexed video data reading in video library
system
    • 视频库系统中复用视频数据读取的方法和装置
    • US5612790A
    • 1997-03-18
    • US299749
    • 1994-09-01
    • Hideki SakamotoKazutoshi NishimuraHideharu SuzukiTomoaki KawaguchiOsamu NakanoTatsuo Mori
    • Hideki SakamotoKazutoshi NishimuraHideharu SuzukiTomoaki KawaguchiOsamu NakanoTatsuo Mori
    • H04N5/78G06F12/00G06F17/30G11B27/00H04N5/93H04N7/173H04N21/2315H04N21/238H04N21/262H04N5/76H04N7/10
    • H04N7/17336G11B27/002
    • A video library system capable of shortening the worst response time with respect to each video data reading request, without lowering the possible level of multiplexing. The multiplexed video data reading is achieved by distributedly storing video data divided into segments among a plurality of data storage devices, where each segment is capable of being read out in one time-slot; selectively connecting each data storage devices with one of data transfer targets by a plurality of switches provided in correspondence to the data storage devices; generating a plurality of control time-slot sequences formed by periodic time-slots in correspondence to the data storage devices with mutually displaced phases in each period of the control time-slot sequences; and controlling the data storage devices and switches such that, in response to a request for reading video data from a data transfer target, an earliest available idle time-slot is selected from the control time-slot sequences, and the segments of the requested video data are sequentially read out from the data storage devices at time-slots corresponding to the selected earliest idle time-slot in the control time-slot sequences and transmitted to the requesting data transfer target as the data storage devices are sequentially switched to the requesting data transfer target by the switches.
    • 一种视频库系统,能够缩短相对于每个视频数据读取请求的最差响应时间,而不降低可能的复用水平。 多路复用的视频数据读取通过分布式存储在多个数据存储装置之中分割成段的视频数据来实现,其中每个段能够在一个时隙中读出; 通过与数据存储装置对应地设置的多个开关选择性地将每个数据存储装置与数据传送目标之一连接; 在所述控制时隙序列的每个周期中,生成与所述数据存储装置相对应的由周期性时隙形成的多个控制时隙序列,所述数据存储装置具有相互移位的相位; 以及控制数据存储设备和交换机,使得响应于从数据传输目标读取视频数据的请求,从控制时隙序列和所请求的视频的片段中选择最早的可用空闲时隙 在控制时隙序列中与所选择的最早的空闲时隙对应的时隙中,从数据存储装置顺序地读出数据,并且随着数据存储装置顺序地切换到请求数据,发送到请求数据传送目标 通过开关传输目标。