JP2608270B2 - Video printer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video printer for sampling a video signal and visually recording the video signal on a recording medium.

<Prior Art> In a video printer of this kind, a video signal is
To sample within a field or one frame period, an extremely high-speed analog-to-digital converter is required. In general, the recording speed of the printer is not so fast,
Sampling was performed over a plurality of fields or a plurality of frames, and printing was performed sequentially from the position where sampling was completed. However, the video printer did not know which point was currently sampling or printing and could not recognize when printing would end.

<Purpose> An object of the present invention is to make it possible to recognize the progress of printing.

<Embodiment> Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a block diagram showing the configuration of a video printer, and FIG. 2 shows a print screen.

In FIG. 2, B indicates the scanning line of the composite video signal, and A indicates the sampling direction. That is, sampling is performed in the vertical direction of the screen, and the sampling lines are sequentially shifted in the horizontal direction.

In FIG. 1, a composite video signal is separated by a sync separation circuit 1 and a vertical sync signal Vs is input to a counter 3 to change the count value. The count value of the counter 3 determines the position of the sampling line in the horizontal scanning direction.
On the other hand, the horizontal synchronizing signal Hs is input to the reset terminal of the counter 2, and resets the counter 2. The counter 2 is, for example, a counter that counts a clock (output of the clock generator 1) having a frequency of about 500 times the frequency of the horizontal synchronizing signal. When the count values of the counter 2 and the counter 3 match, the comparator 5 outputs a sampling pulse SP.

That is, sampling of one vertical line is performed in one vertical period.

Sample hold circuit 6 by sampling pulse SP
Samples the video signal CV, converts it into digital print data PD by the analog-to-digital converter 7, and supplies the digital print data PD to the printer 8.

On the other hand, the sampling pulse SP adjusts the waveform (for example, expands the pulse width) in the waveform shaping circuit 9, is applied to one input terminal of the adding circuit 10, is added to the video signal CV, and is supplied to the monitor 11 as CV. You.

When this is viewed on the monitor 11, the screen is displayed as shown in FIG.
A sampling point 13 appears at 12, and the sampling point of the video signal can be observed.

As described above, in a system for sampling and printing a video signal, it is possible to confirm a sampling point of the video signal on a monitor screen by adding a sampling pulse or a pulse synchronized with the sampling pulse to the video signal.

In this embodiment, an addition circuit is used. However, if a video signal is modulated by a sampling signal or a signal synchronized with the sampling signal, a sampling point can be confirmed on a monitor screen.

Further, the present embodiment can of course be applied to an interlaced video signal.

<Effects> According to the present invention, a user can recognize the progress of printing.

In particular, since the print positions in the horizontal and vertical directions on the screen are shown, the user can sequentially recognize the print positions even when a relatively long time is required for printing.

Further, in order to display the print position as described above on a monitor image of an image to be printed, that is, an image to be recorded corresponding to an input video signal,
Even during recording, it is possible to always check how the image is printed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a video printer according to this embodiment, and FIG.
The figure is a plan view of the monitor screen.

Claims (1)

(57) [Claims] 1. A video printer for recording a video signal as a visible image on a recording medium, wherein said video signal is supplied, and display means for displaying an image to be recorded corresponding to the video signal on a monitor screen. And outputting a video signal corresponding to the print position by a sampling signal corresponding to the print position in the horizontal direction and the vertical direction on the monitor screen,
Means for generating a print position display signal for displaying a print position based on the sampling signal; and means for superimposing the print position display signal on the video signal, wherein the print position display signal is added to the video signal. A video printer wherein a print position is displayed on a display screen by superimposing.