| 摘要 |
PURPOSE:To easily adjust the tone and resolution of a picture by a simple constitution and record a picture having good quality and a tone wedge, by periodically modulating the reference voltage of the comparator circuit, converting a video signal to a binary signal, storing this signal in the memory means, and after that, reading it out and forming a dot on recording paper. CONSTITUTION:A composite picture signal from the input terminal V is inputted to the comparator circuit CM, also it is provided to the isolation circuit D, and horizontal and vertical synchronizing signals HS, VS which have been isolated by the circuit D are provided to the timing pulse generating circuit T and the modulating control circuit SM consisting of a modulating circuit and a control circuit, respectively. A timing signal tW from this circuit T is provided to the circuit SM, the output (b) of the circuit SM is provided to reference voltage of the comparator circuit CM, and the video signal is converted to a binary signal by modulating the reference voltage periodically. The binary video signal is stored in the memory circuits M1-M8, and it is read out to the driving circuit DR by designating the circuit T. The dot forming equipment H is controlled by driving the circuit DR so that a picture having good quality and a tone wedge can be recorded by a simple constitution. |
