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5.激光视盘记录信号的种类激光影碟机可以实现多功能复杂的重放动作,所以在视盘里除了记录图像信号和音频信号外,还要记录控制用的特殊信号。影碟机在重放视盘时,为了正确搜索出所需要的画面动作,一边在画面上显示帧编号和经过的时间,一边用特定画面自动的重放静止画面,还需要将控制信号和地址码信号预先记录在视盘里。如图5所示是地址码信号的位置和波形,地址码信号在电视图像信号的垂直回描线期间内的第16、17、18编号及第 279、280、281编号的各水平扫描线里,分别记录着由24位脉冲码构成的信号。注:24位的表示为
5. Laser disc recording signal types Laser disc players can achieve a multi-functional complex replay action, so in addition to recording video and audio signals in the video disc, but also to record the control of special signals. When playing back a video disc, the player automatically displays the frame number and the elapsed time on the screen in order to correctly search for the desired screen action, and automatically replays the still picture on the specific screen. In addition, the control signal and the address code signal need to be previously Recorded in the video disc. As shown in Fig. 5, the position and waveform of the address code signal are shown in the 16th, 17th and 18th bit numbers of the 279th, 280th, and 281th horizontal scan lines in the vertical retrace line period of the television video signal , Respectively, recorded by the 24-bit pulse code signal. Note: The 24-bit representation is