| 摘要 |
PURPOSE:To prevent extraction errors of a control program signal by discriminating an error in a discriminating signal due to missing of a reproducing signal and allowing a reproducing device to extract the control program signal in response to a prescribed discriminating signal. CONSTITUTION:Reproducing devices 2, 3, 5, 7, 8-11 reproduce a disc 1 to obtain a discriminating signal in the reproducing number, applies it to discriminating means A and an extraction control means B and outputs a control program signal from the reproducing signal from a terminal 13 in response to the discriminating signal. Then the discriminating means A discriminates the presence in an error of the discriminating signal due to missing reproducing signal, and the extraction control means B allows the reproducing device to extract the control program signal in response to the discriminating signal obtained in precedence when the discriminating signal on the same rotation angle location of the disc prior to the discriminating signal obtained at this time has errors depending on the result of discrimination of the means A. Thus, the missing of the control program signal is prevented. |
