| 摘要 |
A printing apparatus for printing a picture which is formed by a plurality of full and half dots on the screen of a television receiver in response to a luminance signal supplied thereto, includes an integration circuit for integrating the transmitted signal and having a time constant which is selected so that the integrated transmitted signal of a saw-tooth waveform rises to a first level greater than a threshold level when the transmitted signal corresponds to a full dot of displayed information and rises to a second level less than the threshold level when the transmitted signal corresponds to half dot information; a latch circuit for latching the integrated transmitted signal only when the level thereof is greater than the threshold level in response to a latch signal supplied thereto, so as to produce an output signal corresponding only to that portion of the displayed picture formed of full dots; and a printer for printing the picture in response to the output signal.
|
