| 摘要 |
PURPOSE:To make it possible to use one receiver for both domestic telegrams (telephotography) and foreign telegrams (telephotography) by adding simple circuit, such as a circuit discriminating domestic telegrams from foreign telegrams, an OR circuit and a differentiating circuit, to a rotational frequency discriminating circuit. CONSTITUTION:When a foreign telegram is transmitted to circuit 1 by radio at 60RPM in the order of white, phase and picture signals, digital servo circuit 2 is put into operation by the white signal to set a reception level and an output signal is applied to recording circuit 5. On arrival of the phase signal, a discriminating circuit of set rotational frequency 60RPM in rotational-frequency discriminating circuit operates to apply discrimination output 14 to starting circuit 10, which turns recording mechanism 11 to record a photo output corresponding to a picture signal from light source 6. Next, when a domestic telegram is transmitted by radio at 216RPM in the order of phase, white and picture signals, the phase signal selects a discriminating circuit set to 216RPM in discriminating circuit 7 and discrimination output 13 is applied to circuit 10 to drive mechanism 11 and also applied to OR circuit 8 and differentiating circuit 9. This output is applied to FF circuit 4 to unlock circuit 2. |
