| 摘要 |
PURPOSE:To discriminate the signal from sound signals by recording the 1st synchronizing signal to an information signal recording disk together with the 2nd synchronizing signal corresponding to the 1st synchronizing signal. CONSTITUTION:Both Ch-1 and Ch-2 are transmitted in a cycle of five words and therefore the 1st synchronzing signal SNCH is equal to a synchronzing signal of a cycle equivalent to five clocks of a synchronzing signal Fs. While the 2nd synchronizing signal SUB SYNC is delivered four times during a revolution. The arriving period of signals SUB SYNC equals to three clocks (15 clocks of the signal Fs) of the 1st synchronizing signal. Thus the arriving period of the 2nd synchronizing signal for discrimination of the recording start position of the signal data is equal to a period equivalent to 147 clocks (735 clocks of the signal Fs) of the 1st synchronizing signal. While the signal data are arranged at the time position after laps of a prescribed period (a period equivalent to nine clocks of the 1st synchronizing signal or to 45 clocks of the signal Fs) from the leading edge of the 2nd synchronzing signal (for discrimination of the record starting position of the signal data in the arriving period equivalent to three clocks of the 1st synchronizing signal or to 15 clocks of the signal Fs). |
