| 摘要 |
<p>PURPOSE:To prevent a malfunction in the titled system by transmitting a burst wave of a fixed period of time with a modulated mark ratio and another burst wave of a sufficiently large width which is applied with the modulation of the mark ratio at fixed intervals after the first burst wave, and commanding the execution of a control instruction corresponding to a control code. CONSTITUTION:An FF15 is reset at the rise of a mark code A1, and the output inverse Q changes to a high level from a low level to be sent to the input of one side of an AND circuit 16. When the output B1 of a mono-multi 11 is applied to the input of the other side of the circuit 16, ''1'' is written at the position R1 of a register 8. Then ''0'' is written at the position R1 when a space code A2 has a fall. Thus ''1'' is shifted to the position R2. Furthermore ''1'' is written to the position R1 with the fall of a mark code A3 in its reception mode, and ''01'' is shifted. A signal A4 is set at a high level despite the fall B4 is set at a high level despite the fall B4 of a signal in case a block synchronizing code A4 produced by a sufficiently long burst wave is received. Thus a decoder 9 is set enable, and X101 is written at positions R1-R4 of the register 8 respectively.</p> |
