| 摘要 |
In a video disc recording and playback system, the video fields on the disc are identified by digital information recorded during the vertical blanking interval. The recorded digital information includes in the order named, a Barker start code sequence, an error detection coset code and information bits which include a field number corresponding to the video field being recorded. The arrangement results in improved noise immunity and simpler decoding hardware in the video disc player. The digital information is utilized to control a number of functions during the playing of a video disc record such as the calculation and display of elapsed playing time, lifting the stylus at the end of the program, and the detection and correction of locked groove conditions. |
